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Volvo BM L70B Service Manual

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BM L70B Wheel Loader

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Service Manual

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Page 1 BM L70B Wheel Loader W E B E D I T I O N Service Manual...
Page 2: Document Title
Profile: Description Volvo BM L70C is a four-wheel drive loader with articulated steering. The engine is a 6-cylinder, turbocharged diesel engine type TD61GD or TD63KDE (low-emission engine). The transmission is hydro-mechanical, where all gears are in constant mesh. The type designation is HT90.
Page 3: Service Information
Service Information Document Title: Function Group: Information Type: Date: Product Identification Service Information 2014/5/19 Plates Profile: Product Identification Plates From the picture and the text below it can be seen which product identification plates should be found on the machine. When ordering spare parts and when making enquires per telephone or correspondence, the model designation and Product Identification Number, (PIN) should be stated.
Page 4 The attachment bracket* type and serial numbers are positioned on the right side. *Optional equipment...
Page 5 Service Information Document Title: Function Group: Information Type: Date: Time Guide Service Information 2014/5/19 Profile: Time Guide Regarding: L70C 16 Lubricants, fuels and other liquids Op.no. Time (h) Operation 16206 Engine, changing oil and filter 16234 1,75 Hydraulic oil tank, changing oil and filter excl.
Page 6 21318 Cylinder liners and pistons, replacing all 21412 Valves, adjusting 21436 Valve covers all, fitting new gasket 21502 Timing gear cover, fitting new gasket in machine 21530 Timing gear, replacing in machine 21532 Timing gear case, fitting new gasket in machine 21614 Crankshaft, replacing front oil seal...
Page 7 26114 Radiator hoses lower, replacing 26116 Radiator hoses all, replacing 26202 Coolant pump, replacing 26271 Coolant pump removed, reconditioning 26298 0,75 Thermostat, replacing 26322 Fan belt and/or alternator-, compressor belt, replacing all belts 27 Engine control 27322 Stop cable control, replacing 27323 Electrical engine shut down, check and adjusting...
Page 8 36302 0,75 Windscreen wiper front, replacing motor 36303 0,75 Windscreen wiper, replacing switch 36304 0,25 Windscreen flusher pump, replacing 36404 0,25 Switch, replacing 36408 0,25 Brake light switch, replacing 36720 ECU, replacing 36721 CU 8, replacing 38 Instruments, sender units, warning systems 38603 Transmission oil pressure sensor, replacing...
Page 9 46103 Axle, fitting 46105 Drive shaft, replacing one side 46113 Centre gear, axle removed, reconditioning 46114 1,75 Pinion front, fitting new gasket 46140 Hub retainer, replacing 46141 Hub retainer removed, reconditioning 46142 Hub retainer, reconditioning one side 46143 Hub, replacing seal 46152 0,25 Differential lock front, repacking excl...
Page 10 64 Steering 64121 Adjustable steering column, replacing 64515 Steering system, checking and adjusting standby pressure 64528 Steering system, checking and adjusting working pressure 64560 Steering cylinder, repacking in machine 64577 Steering cylinder removed, reconditioning incl replacing bearings 64581 1,75 Steering valve removed, reconditioning 64582 Steering valve, replacing 64793...
Page 11 87402 Refrigerant, draining 87403 Cooling unit, performance test 87405 1,75 Refrigerant, filling excl vacuum pumping 87406 Compressor, replacing incl draining and filling 87407 V-belt, replacing 87410 Condenser, replacing incl draining and filling 87411 Receiver, replacing incl draining and filling 87412 Evaporator, replacing incl draining and filling 87413...
Page 12 91605 Boom suspension system, checking opening pressure 94 Unit for load handling 94502 Lift frame, replacing bearing in lower bucket- or implement attachment 94503 Implement attachment, measuring clearence of lower bearing 94504 Lift cylinder, replacing 94505 Lift cylinder, repacking in machine 94506 Lift cylinder removed, repacking 94507...
Page 13: Table Of Contents
Service Information Document Title: Function Group: Information Type: Date: E-tool Service Information 2014/5/19 Profile: E-tool Drawings of tool (E-tool ) which can be made in your own workshop The measurements on the drawings are given in mm, unless otherwise stated (1 mm = 0.0397 in) E 616 Trolley Figure 1 Castor, 4 pcs...
Page 14: Figure 3
Figure 3 Is marked: Max. load 2.5 tonnes E1370 and the manufacturer's name. 13701 Material, plate SIS 2172 13702 Material, plate SIS 2172 Bolt M8x20 Pipe, DIN 2391 - Pcs 35 ø100X5.0 L= 2250 13705 Material, SIS 2172 13706 Material, SIS 2172 13707 Material, SIS 2172 Material, SIS 2172 Material, SIS 2172 L=1866...
Page 15: Figure 4
Figure 4 E 13702 Support...
Page 16 Figure 5 Edge to be chamfered E 13705 Support...
Page 17 Figure 6 E 13706 Support...
Page 18 Figure 7 E 13707 Support...
Page 19 Figure 8 Material: Plåt SIS 2172 E 1687...
Page 20 Figure 9 Material: SIS 2172–03 E 1752 Lifting yoke Figure 10...
Page 22: Service Information
Service Information Document Title: Function Group: Information Type: Date: A few simple rules for Service Information 2014/5/19 batteries Profile: A few simple rules for batteries  Batteries give off explosive gases. Never smoke around any batteries. Figure 1  The electrolyte causes burns to the skin and is corrosive. ...
Page 23: Information Type: Date: Service Information
Service Information Document Title: Function Group: Information Type: Date: A few simple rules of safety 191 Service Information 2014/5/19 Profile: A few simple rules of safety Before operating  Apply the rules given in the operator's instruction manual to the operation of the machine. Therefore read what has to be done before you take your place in the operator's seat and start operating the machine! A few important rules are given below: ...
Page 24  Always wear a hard hat, safety glasses, gloves, protective shoes and other protective articles when the work so requires.  Before starting the engine indoors, make sure that the extraction capacity of the ventilation system is sufficient. The machine is provided with a diesel engine and the exhaust gasses may be dangerous to your health. Therefore, make sure of good ventilation and avoid running the engine more than necessary where the ventilation is inadequate.
Page 25 Figure 3 When the engine is running  Respect the warning lamps. The red lamps require immediate action or consideration, see instructions in the operator's instruction manual under the instruments section.  If you leave the machine, the parking brake must be applied and the attachment resting on the ground. Move the gear selector to neutral.
Page 26 covers locked.  Prevent unauthorized use of the machine by for instance locking the cab and turning off the main current with the battery disconnect switch.  The operator should make sure that the machine cannot freeze to the ground or sink etc. If required, take necessary action.
Page 27  When lifting the machine the eyes intended for lifting should be used and the steering frame joint should be locked. The lifting eyes are positioned at the top of the front frame and by the rear ladder. Figure 6 ...
Page 28 Service Information Document Title: Function Group: Information Type: Date: A few simple rules when Service Information 2014/5/19 inflating tyres Profile: A few simple rules when inflating tyres  The machine should not be loaded when checking the tyre pressure.  Make sure that you stand to one side of the tyre when inflating a tyre fitted on a split rim.
Page 29 Service Information Document Title: Function Group: Information Type: Date: A few simple rules when Service Information 2014/5/19 servicing Profile: A few simple rules when servicing  No work must be carried out on the machine until you have acquired the appropriate knoLedge. Figure 1 ...
Page 30  If someone is to take over or complete work which you have started, you have to make sure that information is passed on about what has been done and what remains to be done to complete the work.  Read all plates and instructions which are fitted on the machine and given in the operator's instruction manual before you begin to service the machine.
Page 31 Figure 4  Before carrying out any service work under raised lifting arm system, the arms should be made safe in the raised position according to the adjacent figure.  Always stop the engine to service the machine, unless otherwise instructed on plates or in this manual. ...
Page 32 Volvo Construction Equipment will not accept any responsibility if any lifting devices, tools or working methods are used other than those described in this publication.  If a jack is to be used, make sure that the ground or floor is even and is sufficiently firm or strong to support the expected load.
Page 33 electronic system and components intended for the function of the machine.  Do not stand behind the machine while the engine is running.
Page 34: Charging Batteries
Service Information Document Title: Function Group: Information Type: Date: Charging batteries Service Information 2014/5/19 Profile: Charging batteries WARNING when a battery is being charged an explosive mixture of oxygen and hydrogen is formed. A short circuit, a open flame or a spark near the battery can cause a powerful explosion. Always turn off the charging current before connecting or disconnecting the charging clips.
Page 35 Service Information Document Title: Function Group: Information Type: Date: Danger in connection with Service Information 2014/5/19 polymer materials Profile: Danger in connection with polymer materials Working on painted surfaces  When welding and cutting, the paint finish must first be removed from an area with a radius of at least 10 cm (4 in) from the point of welding or cutting.
Page 36 Check list If a machine has been damaged by fire or been exposed to intense heat, the following protective measures must under all circumstances be followed:  As a precaution, seals (o-rings and other oil seals) should always be handled as if they were made of fluor rubber. ...
Page 37 Service Information Document Title: Function Group: Information Type: Date: Measures to prevent fire Service Information 2014/5/19 Profile: Measures to prevent fire  There is always a risk of fire. Find out which type of fire extinguisher to use, where it is kept and how to use it. The fire extinguisher should be positioned as shown in the figure or externally in a box which can be locked.
Page 38  At the slightest sign of fire, if the circumstances permit and bearing in mind your own safety, take the following steps:  Drive the machine away from the danger area.  Lower the lifting arms to the ground.  Stop the engine with the stop control and turn the ignition key to the "0"...
Page 39  Lead to induction-air preheating coil.  When unfused leads have been disconnected, it is important to check that they are connected and clamped in such a way that they cannot be exposed to chafing. Unfused leads must not lie against oil and fuel hoses. ...
Page 40 Service Information Document Title: Function Group: Information Type: Date: Refrigerant air- Service Information 2014/5/19 conditioning units Profile: Refrigerant in air-conditioning units General Refrigerant r134a is used in the air conditioning, see also section 8. The type plate shows which kind of refrigerant is used and the amount needed to fill the system.
Page 41 The ac unit is pressurised and refrigerant can unintentionally leak. Never loosen hoses or the filling plug on the compressor. If a leak is suspected, the system must not be refilled. Contact an authorised Volvo Construction Equipment workshop and ask them to take action.
Page 42 In order to maintain safe and efficient operation always use genuine Volvo Construction equipment spare parts which are intended and adapted for your machine.
Page 43: Service Position
Service Information Document Title: Function Group: Information Type: Date: Service position Service Information 2014/5/19 Profile: Service position Before you begin any service work on the machine: position it on level ground and prepare it for servicing as listed below: Figure 1 Steering frame joint lock connected.
Page 44: Starting With Booster Batteries
Service Information Document Title: Function Group: Information Type: Date: Starting with booster Service Information 2014/5/19 batteries Profile: Starting with booster batteries When starting with booster batteries the following points must be observed: Check that the booster batteries or any other power source has the same voltage as the standard batteries. WARNING because of current surge the batteries may explode if a fully charged battery is connected to a discharged battery.
Page 46 Service Information Document Title: Function Group: Information Type: Date: Charging batteries Service Information 2014/5/19 Profile: Charging batteries Risk of explosion When charging, the battery gives off hydrogen gas, which, when mixed with air, will approxuse an explosion if ignited. Short- circuiting, an open flame or spark close to the battery approxn approxuse a powerful explosion.
Page 47 Service Information Document Title: Function Group: Information Type: Date: Cleanliness when working Service Information 2014/5/19 on brake and hydraulic systems Profile: Cleanliness when working on brake and hydraulic systems In all work on these systems, the greatest possible cleanliness must be exercised. Wipe off all pipe and hose connections before they are disconnected and remove any flakes of paint etc.
Page 48: Electric Welding
Service Information Document Title: Function Group: Information Type: Date: Electric welding Service Information 2014/5/19 Profile: Electric welding Before approxrrying out electric welding on the machine or attachments connected to the machine, the battery disconnect switch must be turned off or the battery earth lead disconnected. Connect the welding unit as close as possible to the point of welding.
Page 49: Function Group
Service Information Document Title: Function Group: Information Type: Date: Repairing hydraulic Service Information 2014/5/19 systems Profile: Repairing hydraulic systems When changing pump or after any repair to the hydraulic system when air may have entered the system, the points below should be followed: Start the engine and run it at low idling for approx.
Page 50 Service Information Document Title: Function Group: Information Type: Date: Towing / recovering Service Information 2014/5/19 Profile: Towing / recovering Measures for towing / recovering WARNING If it is possible, before towing / recovering, the engine should be started so as to be able to operate the brake and steering functions satisfactorily.
Page 51 Figure 2 Towing device Towing If the machine, after recovery, must be towed to a workshop, use a towbar connected to the towing device as described above, or a wire rope attached to the towing eyes inside the front axle attachment to the frame. If the brakes do not function (the engine approxnnot be started), a towbar should always be used.
Page 52 transport the machine on a trailer.
Page 54 Service Information Document Title: Function Group: Information Type: Date: Description Service Information 2014/5/19 Profile: Description Loaders L70B and L70C are provided with a six-cylinder, four-stroke, direct-injection, turbocharged, diesel engine type TD61GD or TD63KDE (low-emission engine). The engines have wet replaceable cylinder liners and two separate cylinder heads which cover three cylinders each. The cylinder heads are interchangeable.
Page 55 Figure 2 Piston for TD63KDE (principle diagram) Principal differences between TD63KDE and TD61GD.  Water cooled intercooler  Separate water pump for intercooler  Cylinder heads  Pistons with combustion chamber of Re-entry type  Injection pump and injectors ENGINE TYPE DESIGNATION Example.
Page 56 at rpm 1200 g/kwh 14,20 0,93 1,90 LOW-EMISSION ENGINE L70B/C Output at rpm 2100 Torque at rpm 1100 g/kwh 7,20 0,43 1,00 0,22 Emission values according to ISO 8178 C1 Output and torque = Gross Figure 5 Engine TD61GD Injection pump Feed pump Fuel filter Water trap...
Page 57 Figure 6 Engine TD61GD Oil filter Oil cooler Preheating element Figure 7 Engine TD63KDE Injection pump Feed pump Fuel filter Water trap Serial number and type designation Turbocharger Intercooler Oscillation damper...
Page 58 Figure 8 TD63KDE Oil filter Oil cooler Coolant pump for intercooler Preheating element Automatic belt tensioner Both engine versions are equipped with an automatic belt tensioning device using a compression spring. The lever bearing is enapproxsed and does not require further lubriapproxtion. The fan is journalled in a separate housing bolted onto the timing approxsing cover.
Page 59 The engines have also been provided with pressure prestressed delivery pipes. Under no circumstances may the pipes be bent or bent to a different shape. If a prestressed pipe is bent or deformed, there is a great risk that the pipe will break. A damaged delivery pipe should always be changed. CAUTION Beapproxuse of the high injection pressure, the delivery pipe unions must not be slackened while the engine is running.
Page 60 Ignition switch in position Voltage to electronic control unit CU8 terminal 0 Volt 0 Volt 7, 8 24 Volt 6, 12 24 Volt 3, 9 24 Volt 24 Volt 1, 2 eller 3 24 Volt 0 Volt (24 Volt at engine power) 7, 8 24 Volt 6, 12...
Page 62 Figure 13 Wiring diagram, key-turn engine stop STARTING ENGINE Description of function With the ignition switch SW1 in position 3, the coil in relay RE9 obtains current via the ignition switch terminal 50. Relay RE9 is activated and starter motor terminal 50 obtains current via fuse FU26, relay RE9 (30 - 87) and relay RE11 (30 - 87A) - the starter motor is activated.
Page 64 Figure 14 Wiring diagram starter circuit PREHEATING Description of function The ECU senses the coolant temperature via the engine temperature sensor (SE1) and regulates the preheating time as follows: Manually: The preheating time is dependent on the coolant temperature: Temperatures from -10 °C (+14 °F) and up to +30 ÉC (+86 °F): Provides preheating times varying between 50 and 10 seconds.
Page 66 Figure 15 Wiring diagram preheating SPEED CONTROL (20 km/h (12.4 mph) and 30 km/h (18.6 mph))* Description of function The engine is provided with a solenoid MA35 which actuates the governor control arm of the injection pump in such a way that the engine speed is limited to 1800 rpm when the maximum permitted travelling speed is registered.
Page 67 Figure 16 Wiring diagram speed control [ 1]On the L70C both engine types are equipped with preheating as standard. [ 2]Optional equipment...
Page 68 Service Information Document Title: Function Group: Information Type: Date: Engine, Fitting Service Information 2014/5/19 Profile: Engine, Fitting Op nbr 21072 Spakblock, 2 st 750 kg Sling, 1 st 2 m Schackel 3/8" 1 st 1. Lift the engine and remove the rear engine mountings. Lift the engine into the machine. Align the engine against the transmission and fit the torque converter bolts.
Page 69 Service Information Document Title: Function Group: Information Type: Date: Engine, removing Service Information 2014/5/19 Profile: Engine, removing Op nbr 21070 Ratchet block 750 kg (1654 lb), 2 pcs Sling 2 m, 1 pc Shackle 3/8", 1 pc 1. Secure the frame joint with the frame joint lock. 2.
Page 70 Draining coolant Header tank approxp Draining valve cylinder block Draining nipple lower part of radiator  4. Remove mudguards and covers.[ 1] 5. Disconnect connector (BZ) and remove the radiator grill. Remove the coolant hoses from the radiator. 6. Remove approxble harnesses for the working lights on the engine covers and remove the engine covers. 7.
Page 71 The B+ approxble between the alternator and the starter motor should be disconnected at the starter motor. Remove the accelerator control. 13. Position a jack under the transmission, see Fig. Figure 3 Jack under transmission Figure 4 14. Connect a lifting device, see Fig. Remove the hose between the flywheel housing and the transmission. Loosen the transmission oil filler pipe from the engine.
Page 72 Figure 5 Attaching points for lifting engine 15. Remove the alternator and additional water pump. Lift the engine. Remove the rear engine mountings from the engine. Figure 5 16. Lift the rear end of the engine with the aid of the ratchet block, see Fig. Lift away the engine.
Page 73: Fault Tracing
Service Information Document Title: Function Group: Information Type: Date: Fault tracing Service Information 2014/5/19 Profile: Fault tracing Op nbr 1. Kontrollera först: The fluid level.  Control and warning lamps.  Instruments.  Battery voltage.  Fuses (correct amperage). 2. Separate systems: If two or more systems, and/or circuits work together.
Page 74: Fuel System, Air Bleeding
Service Information Document Title: Function Group: Information Type: Date: Fuel system, air bleeding Service Information 2014/5/19 Profile: Fuel system, air bleeding Op nbr 23301 E 1351 Spanner 1. Loosen the bleeder screw on the filter head. 'Pump with the hand pump until fuel free from air bubbles flows out. Tighten the bleeder screw.
Page 75 Figure 1 Fuel system, air bleeding Bleeder screw, filter head Hand pump, feed pump Pressure equaliser Delivery pipes...
Page 76 Service Information Document Title: Function Group: Information Type: Date: Fuel tank, removing and Service Information 2014/5/19 fitting Profile: Fuel tank, removing and fitting Op nbr 23410 Removing 1. Empty the fuel tank. Disconnect the fuel pipes and electriapproxl leads from the fuel tank. 2.
Page 77: Service Information
Service Information Document Title: Function Group: Information Type: Date: Checking engine speed and Service Information 2014/5/19 travelling speed with frequency meter Profile: Checking engine speed and travelling speed with frequency meter Op nbr Frequency meter If the machine is not provided with a display unit and a service display unit is not available, the engine speed approxn be checked with a frequency meter.
Page 78 Engine speed (+) Travelling speed (+) Chassis connection (-) NOTE! Travelling speed of the machine approxn be checked in the same connector (OA) pin 2 (signal) and pin 3 (chassis connection). Conversion factor, frequency to travelling speed (km/h): Tyres 17.5 R25 Travelling speed = obtained frequency Tyres 20.5 R25 Travelling speed = obtained frequency...
Page 79 Service Information Document Title: Function Group: Information Type: Date: Idling speed, checking and Service Information 2014/5/19 adjusting Profile: Idling speed, checking and adjusting Op nbr 23601 Service display unit * * Is used when the machine is not provided with a display unit (optional equipment). The following applies when checking: Idling speed Low :...
Page 80 Figure 2 The injection pump governor Adjusting screw for low idling Adjusting screw for idling speed damping 5. Remove the protective approxp and fully slacken adjusting screw 2 for the idling speed damping. 6. Set the idling speed to approx. 665 ± 30 rpm. Adjust with adjusting screw 1. 7.
Page 81 Figure 3 (Principle diagram) Adjusting idling speed Adjusting screw, for low idling Adjusting screw, for high idling Governor control arm, accelerator control [ 1]optional equipment...
Page 82 Service Information Document Title: Function Group: Information Type: Date: Injection angle (timing), Service Information 2014/5/19 checking and adjusting Profile: Injection angle (timing), checking and adjusting Op nbr 23630 999 3590 Gear 998 6848 Measuring tool Engine injection pump timing: TD61GD 16°...
Page 83 Figure 1 Flywheel graduatyion 999 3590 3. Rotate the flywheel until the piston in the first cylinder is in its compression stroke. There should be a clearance at the rocker levers for the first cylinder. Check that the flywheel graduation is visible under the pointer in the flywheel housing, see Fig.
Page 84 4. Remove the plug and the sealing washer so that the tappet for the first pump element becomes visible. Rotate the flywheel back against the direction of rotation of the engine approx. 1/4 of a turn. 5. Remove the plug and the sealing washer above the hole for the first pump element. Fit the tool 6848 together with accompanying bolt.
Page 85 Figure 4 The direction of rotation of the pump 11. Check the timing according to points [Invalid linktarget] and [Invalid linktarget] . 12. Remove tool 6848, re-fit the plugs on the injection pump, the cover over the flywheel graduation and the cover over the pump drive.
Page 86 Service Information Document Title: Function Group: Information Type: Date: Injection angle (timing), Service Information 2014/5/19 checking adjusting (with injection timing tool 998 7057) Profile: Injection angle (timing), checking and adjusting (with injection timing tool 998 7057) Op nbr 23630 998 7057 Injection timing tool 999 3590 Gear Checking 1.
Page 87 4. Rotate the flywheel in the direction of rotation of the engine until both light emitting diodes light up. Read off the number of degrees on the flywheel graduation and check that the timing is within the upper half of the tolerance range, see SB "Diesel testing standards"...
Page 88 Checking injection angle (timing) (Principle diagram) CAUTION The figure is showing the L90C Injection timing tool 7057 Outlet in governor housing Tapp passas in mot uttag Pin is aligned with recess Flywheel graduation marks Gear 3590 with ratchet handle Plug for filling oil Chassis connection In direction of rotation Against direction of rotation...
Page 89 Service Information Document Title: Function Group: Information Type: Date: Speed control, checking Service Information 2014/5/19 and adjusting Profile: Speed control, checking and adjusting Op nbr The following applies when checking: Idling speed Limited: 1800 ± 25 rpm High: 2340 ± 60 rpm Figure 1 1.
Page 90 unit. The governor control arm should now be limited by the solenoid so that a lower idling speed, than the one  recorded in point 3, is obtained[ 1] . Any adjustments are approxrried out on nut 2 and holder 3 after the rubber bellows have been removed (preset to 23 mm (0.9 in)) Fig.
Page 92 Service Information Document Title: Function Group: Information Type: Date: Stall speed, checking Service Information 2014/5/19 Profile: Stall speed, checking Op nbr 23602 999 3721 Service display unit * * Is used when the machine is not provided with a display unit (optional equipment). The following applies when checking: Idling speed Low:...
Page 93 Service Information Document Title: Function Group: Information Type: Date: Stop solenoid, Service Information 2014/5/19 adjustment<br />(applies to L70B and L70C up to incl. ser. no. -11470) Profile: Stop solenoid, adjustment Op nbr 27323 Checking adjustment Figure 1 1. Check that lever 1, Fig. , goes against stop clamp 2 when the stop solenoid is without current, i.e.
Page 94 Service Information Document Title: Function Group: Information Type: Date: Stop solenoid, Service Information 2014/5/19 adjustment<br />(applies w.e.fr. L70C ser. 11471-) Profile: Stop solenoid, adjustment Op nbr 27323 Checking adjustment Figure 1 1. Check that lever 2, Fig. , goes against the stop clamp when the stop solenoid is without current, i.e. the ignition key in position 0 (turned off).
Page 95 file:///C|/Users/app/Documents/yeqiwen-END.txt[2014/5/19 15:00:17]...
Page 96 Service Information Document Title: Function Group: Information Type: Date: Description Service Information 2014/5/19 Profile: Description General description The machine is provided with a 24 V electriapproxl system with an alternating current generator (alternator). The two 12 V batteries, each of 105 Ah, are connected in series and positioned on either side of the rear frame, behind the rear wheels. Electriapproxl distribution box in approxb Fuses, relays and control units (ECU / Electronic Control Unit) is positioned in an electriapproxl distribution box behind the operator seat, see Fig.
Page 97 Service Information Document Title: Function Group: Information Type: Date: Special instructions when Service Information 2014/5/19 working electriapproxl system Profile: Special instructions when working on the electriapproxl system Op nbr 1. Always use fully charged and fully serviceable batteries when approxrrying out tests on the electriapproxl system. 2.
Page 98 Service Information Document Title: Function Group: Information Type: Date: Charging batteries Service Information 2014/5/19 Profile: Charging batteries Risk of explosion When charging, the battery gives off hydrogen gas. Short circuits, open flames or sparks near the battery may approxuse a powerful explosion.
Page 99 Service Information Document Title: Function Group: Information Type: Date: Headlights, adjustment Service Information 2014/5/19 Profile: Headlights, adjustment Op nbr 35202 Check the headlamp adjustment by placing the machine on level ground in front of a wall at a distance of L between the headlamps and the wall, see Fig.
Page 100 Service Information Document Title: Function Group: Information Type: Date: Code key for diodes Service Information 2014/5/19 Profile: Code key for diodes Diodes on circuit board Circuit no Diode no Function DI 1 Guide light (voltage reduction) DI 2 Guide light (voltage reduction) 16:4 DI 2:20 Blocking diode, CDC...
Page 101 3B:6, 4:1 DI 24 Gear shifting solenoids S1 (quenching diode) 3B:6, 4:3 DI 25 Gear shiftfting solenoids S4 (quenching diode) 3B:7, 4:4 DI 26 Gear shifting solenoids S5 (quenching diode) 14:3 DI 27 Central warning, engine oil pressure (blocking diode) 8:5, 8:10, 21:5, 26:8 DI 28 Brake pressure charging (blocking...
Page 102 Service Information Document Title: Function Group: Information Type: Date: Codes used wiring Service Information 2014/5/19 diagrams Profile: Codes used in wiring diagrams = Battery = Capacitor = Electronic Control Unit = Central warning = Diodes = Electronic Control Unit FU, FH = Fuses, see section "Electrical distribution box"...
Page 103 31 D Cable harness centre instruments panel* 31 L Cable harness front left panel* 31 R Cable harness front right panel* 31 S Cable harness right panel* 31 T Cable harness transmission* CIRCUIT BOARD Components which are not connected to ECU 31 DI Diode 31 EA...
Page 104 FU 3 5A = Parking lights rear left, side lights, number plate lighting* 2:9, 19:1 FU 4 20A = Cab fAN/AC FU 5* 5A = Secondary steering 4:5, 27:1, 27:4 FU 6 5A = Transmission disengaging, high and low gear*, differential lock*, constant flow, flow control 3rd function*, attachment hydraulics GP* 12:8...
Page 105 mph) or 30 km/h (18.6 mph) FU 51 15A = Loud tone horn 18:10 FU 52 10A = Air-suspended seat 18:1, 18:4 FU 53 5A = Parking brake alarm 18:9 FU 54 5A = Loud one, air-suspended seat FU 56 Unassigned FU 57 Unassigned...
Page 106 10:3 LA 16 Working lights, attachment* 10:6 LA 22 Working light cab rear, left* 10:6 LA 23 Working light cab rear, right* 10:5 LA 26 Working light, radiator casing, left 10:5 LA 27 Working light, radiator casing, right 11:1 LA 29 Stop lights, left 11:2 LA 30...
Page 107 16:8 MA 28 CDC* 20:3, 20:7 MA 35 Speed limiter 21:2, 26:2 MA 36 A 4th function* 21:2, 26:2 MA 36 B 4th function* MA 41 Floating position 8:8, 8:2, 26:6 MA 48 Pressure draining* up to incl. s/n -12340 8:7, 26:5 MA 51 Attachment locking*...
Page 108 14B:1 Voltage sypply insteuments when operating with the ECU disconected 3:6, 16:8, 17:7 Gear selector 3:6, 16:8, 17:7 R 10 Gear selector 3:6, 16:8, 17:7 R 11 Gear selector 13B:9 R 12 Central warning when operating whit the ECU disconnected R 13 Secondary stepping, steering pressure R 14...
Page 109 25:3 RE 35 5th/6th function RE 40 Preheating* RE 41 Secondary steering* 27:5 RE 42 Detent function, flow control 3rd function*/ attachment hydraulics GP 19:6 RE 44 Air conditioning, safety* 19:5 RE 48 Air conditioning, safety* 24A:4 RE 50 Guide light control panel, attachment hydraulics HD* 18:1-7 RF 1...
Page 110 SE 33 Boom kick-out* SE 35 Bucket positioner* 13:6 SE 49 Hydraulic oil level SE 51 Differential pressure, secondary steering* SE 61 Floating position 16:1 SE 62 CDC* 24:8 SE 75 VAngular position sensor, attachment hydraulics HD* 26:8, 21:4, 8:5, 8:10 SE 82 Engagement and disengagement of brake pressure charging...
Page 111 16:4 SW 30 CDC* 16:4 SW 43 Forward/reverse (CDC )* SW 60 Floating position SW 67 Test, secondary steering* 6:10,27:2, 27:8, SW 88 Detent function of 3rd function 17:8, 3:7, 16:8 SW 90 Kick-down at control lever carrier 8:3, 8:8, 26:7 SW 91 Pressure draining of quick-action couplings* / Raised pressure...
Page 112 Service Information Document Title: Function Group: Information Type: Date: Explanations wiring Service Information 2014/5/19 diagrams<br />(lead and component marking) Profile: Explanations to wiring diagrams Figure 1 Positive feed Voltage direct from battery Voltage via ignition switch Voltage via ignition switch, depending on relays RE3/RE4...
Page 114 Voltage via ignition switch, radio position 30 → 30 Direction of current is from large to small box. Boxes with the same designation are connected to each other on the circuit board (via printed circuits). Chassis connection Chassis connection 31xx The designation "xx"...
Page 115 Figure 2 Examples of direction of current Direction of current (the boxes are connected to each other, not drawn in the diagrams)
Page 116: List Of Circuits
Service Information Document Title: Function Group: Information Type: Date: List of circuits Service Information 2014/5/19 Profile: List of circuits NOTE! In cases where there are diagrams showing "operating with the ECU disconnected", these are marked with "B" or "E" in the numbering of the circuits, e.g.
Page 117 6:7 - 9 Floating position 6:8-6:10 Detent function, 3rd function Secondary steering 7:1 - 7 Secondary steering 8:1 - 2 Attachment lock, direct-mounted bucket 8:2 - 3 Pressure draining of quick-action couplings 8:4 - 6 Brake pressure charging s/n -12340 8:6 - 7 Separate attachment locking Pressure draining of quick-action couplings -...
Page 118 12:1 - 2 Voltage converter 12:3 - 6 Radio 12:7 - 8 Heated seat 13:1 - 2 Tachometer sensor, engine 13:2 - 3 Travelling speed sensor 13:3 - 4 Transmission oil pressure 13:4 - 5 Transmission oil temperature 13:6 Hydraulic oil level 13:7 Brake pressure 13:8 - 9...
Page 119 17:5 - 8 Gear selector, speed gears Parking brake mechanical / hydraulic, Rider Truck Safety Norms 18:1-18:3 Parking brake alarm Rider Truck Safety Norms, mechanical parking brake 18:4 - 5 Parking brake alarm Rider Truck Safety Norms, hydraulic parking brake 18:4 - 8 Parking brake alarm with electro-hydraulic parking brake 18:9 -10...
Page 120 26:6-26:7 Pressure draining of quick-action couplings 4th hydraulic function, separate attachment locking s/n 12341- 26D:1-3 4th hydraulic function 26D:4-7 Separate attachment locking 26D:8 Activating 4th function through brake pressure charging Flow control 3rd function / attachment hydraulics GP 27:1-27:3 Detent function 3rd function with emergency stop 27:4-27:8 Flow control 3rd function / attachment hydraulics GP with emergency stop...
Page 121 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 1:1–1:10 Profile: Wiring diagram, circuits 1:1–1:10...
Page 123 Figure 1 Wiring diagram Elschema, Krets 1B:1–1B:10...
Page 125 Figure 2 Wiring diagram, operating with the ECU disconnected Item Component Battery BA 1 and 2 Battery Electronic Control Unit Control unit Reläer RE 2 Unloading ignition switch RE 3 Unloading ignition switch Switches SW 1 Ignition switch (5:1-2) SW 26 Battery disconnect switch Fuses FU 27...
Page 126 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 2:1–2:10 Profile: Wiring diagram, circuits 2:1–2:10...
Page 128 Figure 1 Wiring diagram, circuits 2B:1–2B:10...
Page 129 Figure 2 Wiring diagram, operating with the ECU disconnected...
Page 130 Electronic Control Unit Control unit Motors 2:10 MO 1 Cab fan (19:3) 2:1-4 MO 2 Windscreen wiper front MO 3* Windscreen wiper rear MO 4* Washer front MO 5* Washer rear Resistor R 14 Intermittent wiper Relays RE 6* Reversing alarm RE 7 Intermittent wiper front Horn, alarm...
Page 131 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 3:1–3:10 Profile: Wiring diagram, circuits 3:1–3:10...
Page 132 Figure 1...
Page 133 Wiring diagram Speed limited to 30 km/h (18.6 mph) DI20 removed, 3 speeds when operating with ECU disconnected, see diagram 20:6-8 Speed limited to 20 km/h (12.4 mph) or secondary steering, 2 speeds when operating with ECU disconnected, see diagram 20:1-3 Wiring diagram, circuits 3B:1–3B:10 Figure 2...
Page 135 Wiring diagram Speed limited to 30 km/h (18.6 mph) DI20 removed, 3 speed when operating with the ECU disconnected, see diagram 20:6-8 Speed limited to 20 km/h (12.4 mph) or secondary steering, 2 speed when operating with the ECU disconnected, see diagram 20:1-3 Item Component...
Page 136 Relays RE 10 Delayed disengagement of speed gears when changing travelling direction (16:5, 17:5) Switches SW 2A Directional gear, forward-reverse (16:2, 17:2, 29:1) SW 2B Speed gear (16:5, 17:6) SW 2C Kick-down (16:6, 17:7) SW 90 Kick-down (16:8, 17:8) 3:10 SW 143 Programme selector, APS II Fuses...
Page 137 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 4:1–4:10 Profile: Wiring diagram, circuits 4:1–4:10...
Page 138 Figure 1...
Page 139 Wiring diagram, circuits 4B:1–4B:10...
Page 141 Figure 2 Wiring diagram Item Component Diodes Di 22 Gear shifting solenoids S2 (quenching diode) (3B:3) DI 23 Gear shifting solenoids S3 (quenching diode) (3B:8) DI 24 Gear shifting solenoids S1 (quenching diode) (3B:6) DI 25 Gear shifting solenoids S4 (quenching diode) (3B:6) DI 26 Gear shifting solenoids S5 (quenching...
Page 142 Gear shifting 3:an - 4:an / 2:an - 1:an (3B:8) Gear shifting 2:an - 1:an (3B:6) Gear shifting 3:an - 4:an (3B:7) ( ) Components which are also found in this circuit.
Page 143 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 5:1–5:10 Profile: Wiring diagram, circuits 5:1–5:10...
Page 145 Figure 1 Wiring diagram, circuits 5B:1–5B:10...
Page 146 Figure 2...
Page 147 Operating with the ECU disconnected Item Component Diodes Di 12 Preheating (blocking diode) Di 31 Preheating (quenching diode) Electronic Control Unit 5:5-8 Control unit CU 8 Key-turn engine stop, engine power reduction Control lamps LC 13 Preheating Solenoids 5:10 MA 64 Key-turn engine stop, engine Resistors Engine braking...
Page 148 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 6:1–6:10 Profile: Wiring diagram, circuits 6:1–6:10...
Page 150 Figure 1 Wiring diagram, circuits 6:1–6:10 Item Component Diodes DI 10 Bucket positioner (quenching diode) Di 11 Detent function lifting / Boom kick-out (quenching diode) Di 32 Floating position (quenching diode) 6:10 Di 4:22* Detent function 3rd hydraulic function (27:2, 27:8) Sensor SE 33* Boom kick-out...
Page 151 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 7:1–7:7 Profile: Wiring diagram, circuits 7:1–7:7 Figure 1 Wiring diagram Wiring diagram, circuits 7B:1–7B:7...
Page 154 Figure 2 Operating with the ECU disconnected Item Component Diodes Di 13 Secondary steering (quenching diode) Di 14 Central warning, secondary steering (blocking diode) Electronic Control Unit 7:2-5 Control unit Sensors SE 15* Steering pressure, secondary steering SE 51* Differential pressure, secondary...
Page 155 steering Control lamps LC 14 Low steering pressure, secondary steering LC 15 Secondary steering system Resistors Secondary steering, test Secondary steering R 13 Secondary steering, steering pressure Engines MO 7* Secondary steering with overheating protection NOTE! Earlier MO7 has no overheating protection Relays RE 5*...
Page 156 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 8:1–8:10 Profile: Wiring diagram, circuits 8:1–8:10...
Page 157 Figure 1...
Page 158 Item Component Diodes 8:10 Di 18 Brake pressure charging (blocking diode) (21:5, 26:8) DI 28 Brake pressure charging (blocking diode) (21:5, 26:8) 8:10 DI 29 Brake pressure charging (quenching diode) (21:5, 26:8) DI 33 Pressure draining, attachment locking (blocking diode) (26:7) Sensor 8:5, 10 SE 82...
Page 159 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 8D:1–8D:7 Profile: Wiring diagram, circuits 8D:1–8D:7...
Page 161 Figure 1 Diagram 8D Applies w.e.fr. s/n 12341- Item Component Diodes 8D:5,10 DI 18 Brake pressure charging (blocking diode) (21:5, 26:8) DI 28 Brake pressure charging (blocking diode) (21:5, 26:8) DI 29 Brake pressure charging (quenching diode) (21:5, 26:8) 8D:2, 7 DI 33 Pressure draining, attachment locking (blocking diode) (26:7)
Page 162 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 9:1–9:7 Profile: Wiring diagram, circuits 9:1–9:7...
Page 163 Figure 1 Item Component...
Page 164 Diodes DI 1 Guide light (voltage reduction) DI 2 Guide light (voltage reduction) DI 3 Guide light (voltage reduction) DI 5 Guide light (voltage reduction) DI 8 Low-beam dependent (blocking diode) DI 41 Low-beam dependent (blocking diode) Control lamps 9:10 LC 4 High beams Lamps...
Page 165 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 10:1–10:7 Profile: Wiring diagram, circuits 10:1–10:7 Figure 1 Wiring diagram...
Page 167 Item Component Diodes 10:4 DI 6 Day-notice lights at working lights (blocking diode) 10:4 DI 7 Control lamp, working lights (blocking diode) 10:4 DI 9 Control lamp, working lights (blocking diode) Control lamps 10:4 LC 33 Working lights 10:7 LC 35 Rotating warning beacon Lamps 10:2...
Page 168 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 11:1–11:8 Profile: Wiring diagram, circuits 11:1–11:8...
Page 170 Figure 1 Wiring diagram Item Component Sensor 11:2 SE 29 Stop lights Control lamps 11:3 LC 8 Direction indicators Lamps 11:1 LA 29 Stop lights, left 11:2 LA 30 Stop lights, right 11:7 LA 34 Direction indicator, rear left 11:7 LA 35 Direction indicator, front left 11:6...
Page 171 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 12:1–12:8 Profile: Wiring diagram, circuits 12:1–12:8...
Page 172 Figure 1 Wiring diagram Item Component...
Page 173 Fuses 12:8 FU 7 Heated seat 12:2 FU 13* Voltage converter radio 12:1 FU 29* Voltage converter radio Heater elements 12:8 HE 3 Heated seat* Miscellaneous 12:1-2 Voltage converter * radio 12:3-6 Radio*...
Page 174 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 13:1–13:10 Profile: Wiring diagram, circuits 13:1–13:10...
Page 175 Figure 1...
Page 176 Wiring diagram Wiring diagram, circuits 13B:1–13B:10...
Page 177 Figure 2 Operating with the ECU disconnected Item Component Diodes 13:8 DI 30 Central warning, brake pressure (blocking diode) Electronic Control Unit 13:1-10 Control unit Sensor 13:1 SE 3 Tachometer sensor (inductive) 13:3 SE 4 Travelling speed sensor (inductive) 13:5 SE 11 Transmission oil temperature 13:3...
Page 178 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 13D:1–13D:10 Profile: Wiring diagram, circuits 13D:1–13D:10 Diagram 13D applies to L70C with the new type sensor for transmission oil pressure with a moisture-tight connection directly on sensor SE12...
Page 180 Figure 1 Wiring diagram Wiring diagram, circuits 13E:1–13E:10...
Page 181 Figure 2 Operating with the ECU disconnected Item Component Diode 13D:8 DI 30 Central warning, brake pressure (blocking diode) Electronic Control Unit 13D:1-10 Control unit Sensors 13D:1 SE 3 Tachometer sensor (inductive) 13D:3 SE 4 Travelling speed sensor (inductive) 13D:5 SE 11 Transmission oil temperature 13D:3...
Page 182 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 14:1–14:10 Profile: Wiring diagram, circuits 14:1–14:10...
Page 183 Figure 1...
Page 184 Wiring diagram Wiring diagram, circuits 14B:1–14B:10...
Page 185 Figure 2 Operating with the ECU disconnected Item Component Diodes 14:1 DI 17 Supply instruments, when operating with the ECU disconnected 14:3 DI 27 Central warning, engine oil pressure (blocking diode) Electronic Control Unit 14:1-8 Control unit Sensors 14:5 RE 1 Coolant temperature 14:8 SE 6...
Page 186 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 15:1–15:10 Profile: Wiring diagram, circuits 15:1–15:10...
Page 188 Figure 1 Item Component Diodes 15:7, 10 DI 34 Boom Suspension System (blocking diode) 15:7 DI 4:26 Single-acting lifting (blocking diode) Electronic Control Unit 15:1-4 Control unit Sensors 15:8, 10 SE 87* Disengagement single-acting lifting function (digital 1 bar = 14.5 psi) 15:6 SE 88* Boom Suspension System (activating...
Page 189 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 16:1–16:10 Profile: Wiring diagram, circuits 16:1–16:10...
Page 190 Figure 1 Wiring diagram, lever steering (CDC) Diagram 16D CU 20 Applies to L70C w.e.fr. -12154 Item Component...
Page 191 Diodes 16:5 DI 15 Delayed disengagement of speed gears when changing travelling direction, supply RE10 blocking diode (3:4, 17:5, 29:5) 16:5 DI 16 Delayed disengagement of speed gears when changing travelling direction, supply RE10 blocking diode (3:4, 17:5, 29:5) 16:3 DI 35 Extra forward drive signal, blocking diode (3:2, 17:3, 29:3)
Page 192 Switches 16:2, 16:6 SW 2 Gear selector (3:1, 3:6, 17:2, 17:6-7) 16:2 SW 2A Directional gear, forward - reverse(3:1, 17:2) 16:6 SW 2B Speed gear (3:5, 17:6) 16:7 SW 2C Kick-down (3:6, 17:7) 16:4-5 SW 30* 16:4 SW 43* Directional gear forward/reverse cDC 16:8 SW 90 Kick-down at control lever carrier (3:7,...
Page 193 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 16D:1–16D:9 Profile: Wiring diagram, circuits 16D:1–16D:9...
Page 194 Figure 1 Wiring diagram, lever steering (CDC) Diagram 16 CU 22 applies to L70C up to incl. s/n 12155- Item Component Diodes 16D:5 DI 15 Delayed disengagement of speed gears when changing travelling direction, supply RE 10 blocking diode (3:4, 17:5, 29:5) 16D:5 DI 16...
Page 195 Relays 16D:5 RE 10 Delayed disengagement of speed gears when changing travelling direction (3:5, 17:5) 16D:3 RE 30* 16D:3 RE 31* Switches 16D:2, 16:6 SW 2 Gear selector (3:1, 3:6, 17:2, 17:6-7) 16D:2 SW 2A Directional gear, forward - reverse (3:1, 17:2) 16D:6 SW 2B...
Page 196: Service Information
Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 17:1–17:8 Profile: Wiring diagram, circuits 17:1–17:8 Figure 1 Item Component Diodes 17:5 DI 15 Delayed disengagement of speed gears when changing travelling direction,...
Page 198 supply RE 10 blocking diode (3:4, 16:5, 29:5) 17:5 DI 16 Delayed disengagement of speed gears when changing travelling direction, supply RE 10 blocking diode (3:4, 16:5, 29:5) 17:3 DI 35 Extra forward drive signal, blocking diode (3:2, 16:3, 29:3) 17:3 DI 36 Extra forward drive signal, blocking...
Page 199 speed limit* (3:1, 16:1, 20:2, 20:7) ( ) Components which are also found in this circuit.
Page 200 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 18:1–18:10 Profile: Wiring diagram, circuits 18:1–18:10...
Page 203 Figure 1 Wiring diagram, parking brake mechanical / hydraulic, Rider Truck Safety Norms Item Component Sensors 18:1 SE 5* Operator seat, Rider Truck Safety Norms 18:2 SE 6 Hydraulic parking brake pressure sensor positioned under cab, left side (28:1, 4) SE 6 Mechanical parking brake sensor positioned by p-brake lever...
Page 204 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 19:1–19:7 Profile: Wiring diagram, circuits 19:1–19:7 Figure 1 Elschema hastighetsbegränsning Item Component Sensors...
Page 205 19:6 SE 21* Thermostat, air conditioning 19:6 SE 22* Pressure, air conditioning Solenoid 19:6 MA 17* Compressor, air conditioning Motor 19:7 MO 1 Fan, cab (2:10) Relays 19:6 RE 44 Air conditioning, safety* 19:5 RE 48 Air conditioning, safety* Switches 19:3 SW 6 Cab fan (2:10)
Page 206: Document Title: Wiring Diagram, Circuits
Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 20:1–20:7 Profile: Wiring diagram, circuits 20:1–20:7...
Page 207: Figure 1
Figure 1 Wiring diagram, speed limit Item Component Electronic Control Unit 20:2, 6 Control unit...
Page 208 20:3, 7 CU 9 Speed limiter Solenoid 20:3, 7 MA 35 Speed limiter Fuses 20:2, 6 FU 1 Gear shifting, CDC*, dual control*, speed limit* 20:3, 7 FU 50 Speed limit...
Page 209: Service Information
Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 21:1–21:5 Profile: Wiring diagram, circuits 21:1–21:5 Figure 1 Wiring diagram Applies up to incl. s/n -12340 Item Component Diodes 21:3 DI 4.24* 4th function (blocking diode) (26:3) 21:5 DI 18 Brake pressure charging (blocking...
Page 211 diode) (8:5, 8:10, 26:8) 21:8 DI 28 Brake pressure charging (blocking diode) (8:5, 8:10, 26:8) 21:8 DI 29 Brake pressure charging (quenching diode) (8:5, 8:10, 26:8) Sensor 21:4 SE 82 Engagement and disengagement of brake pressure charging (8:5, 10, 26:8) Solenoids 21:2 MA 36A*...
Page 212 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 21D:1–21D:5 Profile: Wiring diagram, circuits 21D:1–21D:5 Figure 1 Wiring diagram L70C Applies w.e.fr. s/n 12341- Item Component Diodes 21D:5 DI 18 Brake pressure charging (blocking diode) (8:5, 8:10, 26:8) 21D:8 DI 28...
Page 214 diode) (8:5, 8:10, 26:8) 21D:8 DI 29 Brake pressure charging (quenching diode) (8:5, 8:10, 26:8) Sensor 21D:4 SE 82 Engagement and disengagement of brake pressure charging (21:4, 26:7) Solenoids 21D:2 MA 36A* 4th function (26:2) 21D:2 MA 36B* 4th function (26:2) 21D:4 MA 57 Brake pressure charging (8:5, 8:10, 26:8)
Page 215 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 22:1–22:9 Profile: Wiring diagram, circuits 22:1–22:9...
Page 217 Figure 1 Item Component Display 22:2-8 Display, display unit for the operator Electronic Control Units 22:5-8 Control unit Connector 22:9 Connector for service display unit...
Page 218 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 24:1–24:10 Profile: Wiring diagram, circuits 24:1–24:10...
Page 220 Figure 1 Wiring diagram, attachment hydraulics HD Applies to L70C up to incl. s/n -12829 Item Component Electronic Control Unit 24:5-9 CU 72 Control unit HD-hydraulics Sensors 24:8 SE 75 Position sensor (the pump yoke angle) 24:2 SE 96 Pressure sensor Instruments 24:2 IM 10...
Page 221 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 24A:1–24A:10 Profile: Wiring diagram, circuits 24A:1–24A:10...
Page 223 Figure 1 Wiring diagram, attachment hydraulics HD Applies w.e.fr. s/n 12830- Item Component Electronic Control Unit 24:5-9 CU 72 Control unit HD-hydraulics Sensors 24A:8 SE 75 Position sensor (pump yoke angle) 24A:2 SE 96 Pressure sensor Instruments 24A:2 IM 10 Pressure gauge attachment hydraulics 24A:7 IM 70...
Page 224 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 25:1–25:9 Profile: Wiring diagram, circuits 25:1–25:9...
Page 225 Figure 1...
Page 226 79 Wiring diagram, 5th/6th hydraulic function Item Component Diodes 25:4 DI 4.23* 5th/6th hydraulic function Electronic Control Unit 25:5-6 CU 15* 6th hydraulic function 25:6 CU 16* Lever, 6th hydraulic function 25:7-9 CU 17* 5th hydraulic function 25:9 CU 18* Lever, 5th hydraulic function Solenoids 25:6...
Page 227 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 26:1–26:8 Profile: Wiring diagram, circuits 26:1–26:8...
Page 229 Figure 1 Wiring diagram, 4th hydraulic function, (brake charging, attachment lock) L70C up to incl. s/n -12340...
Page 230 Item Component Diodes 26:8 DI 18 Brake pressure charging, (blocking diode) (8:5, 10, 21:5) 26:8 DI 28 Brake pressure charging, (blocking diode) (8:5, 10, 21:5) 26:8 DI 29 Brake pressure charging, (quenching diode) (8:5, 10, 21:5) 26:6 DI 33 Pressure draining, attachment locking (blocking diode) (8:2,7) 26:3 DI 4.24...
Page 231 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 26D:1–26D:8 Profile: Wiring diagram, circuits 26D:1–26D:8...
Page 233 Figure 1 Wiring diagram, 4th hydraulic function (brake charging, attachment lock) L70C w.e.fr. s/n 12341- Item Component...
Page 234 Diodes 26D:8 DI 18 Brake pressure charging, (blocking diode) (8:5, 10, 21:5) 2D6:8 DI 28 Brake pressure charging, (blocking diode) (8:5, 10, 21:5) 26D:8 DI 29 Brake pressure charging, (quenching diode) (8:5, 10, 21:5) 26D:6 DI 33 Pressure draining, attachment locking (blocking diode) (8:2,7) Solenoids 26D:2...
Page 235 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 27:1–27:8 Profile: Wiring diagram, circuits 27:1–27:8...
Page 237 Figure 1 Wiring diagram, flow control 3rd function / attachment hydraulics GP Item Component Diodes 27:2, 8 DI 4.22* Detent function 3rd function...
Page 238 (quenching diode) (6:10) 27:7 DI 28* Flow control 3rd function (blocking diode) Solenoids 27:2 MA 76* Detent function, 3rd function (6:10) 27:6 MA 150* Flow control 3rd function*, attachment hydraulics GP (4:10) Switches 27:2 SW 88* Detent function 3rd function (6:10) 27:2 SW 137* Emergency stop...
Page 239 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 28:1–28:9 Profile: Wiring diagram, circuits 28:1–28:9...
Page 241 Figure 1 Wiring diagram, mechanical/hydraulic p-brake Item Component Electronic Control Units...
Page 242 28:1, 7 Control unit Sensor 28:2, 4 SE 6 Parking brake (mechanical in cab / hydraulic under cab left side) (18:2) Control lamp 28:2, 8 LC 9 Parking brake (18:3, 18:9) Solenoid 28:5 MA 67* Electro-hydraulic parking brake (18:6) Relay 28:6 RE 28* Electro-hydraulic parking brake (18:7)
Page 243 Service Information Document Title: Function Group: Information Type: Date: Wiring diagram, circuits Service Information 2014/5/19 29:1–29:10 Profile: Wiring diagram, circuits 29:1–29:10...
Page 245 Figure 1 Wiring diagram, automatic greasing Item Component Diodes 29:5 DI 15 Delayed disengagement of speed gears when changing travelling direction, supply RE10 (blocking diode) (3:4, 16:5, 17:5) 29:5 DI 16 Delayed disengagement of speed gears when changing travelling direction, supply RE10 (blocking diode) (3:4, 16:5, 17:5) 29:3...
Page 246 automatic greasing* (20:2, 6) 29:6 FU 55 Automatic greasing 29:7 FU 58 Automatic greasing 29:7 FU 59 Automatic greasing...
Page 247: Service Information
Service Information Document Title: Function Group: Information Type: Date: Electrical distribution box Service Information 2014/5/19 Profile: Electrical distribution box Most fuses, relays and other electrical components are concentrated in the electrical distribution box. The distribution box is fitted inside the cab behind the operator's seat and is provided with a decal showing which appliances the different fuses serve.
Page 248 point Cab, miscs (radio, p-brake, steering* ceiling) DA/DB Speedometer/control lamp CDC*dual control, forward - panel reverse SA/SB Switch right side Transm. (F/R, low gear/high gear) Emergency operation Front frame Gear shift control / steering column stalk control, right side Panel, left side * Optional equipment Figure 2 Circuit board...
Page 249 Figure 4 BA, DA, F, GW, EX, EZ, SA Figure 5 CD, L, T, R, SB Figure 6 RF 1 Figure 7 RE 1 - 13...
Page 250 Figure 8 BB, DB, OB, OA Figure 9 Electrical distribution box, relays and fuses (Fuses are listed in Codes used in wiring diagrams) Relays (positioned in electrical distribution box unless otherwise stated) 1 Bucket positioner* 2 Unloading ignition SWITCH 3 Unloading ignition switch 4 Boom kick-out* 5 Steering pump* (Secondary steering) 6 Reversing alarm*...
Page 251 12 Working lights* front mudguards and attachment lights 20 Extra, forward/reverse 21 Extra, forward/reverse 22 (Boom Suspension System*) 23 Air-suspended seat* 24 Parking brake alarm 25 Loud tone horn* 26 Extra unloading ignition switch (15E) 30 CDC* (positioned in the arm rest CDC) 31 CDC* (positioned in the arm rest CDC) 40 Preheating* (positioned in engine compartment)
Page 252: Instruments And Controls
Service Information Document Title: Function Group: Information Type: Date: Instruments and controls Service Information 2014/5/19 Profile: Instruments and controls Figure 1 Instrument panels...
Page 253 Figure 2 Other controls Parking brake (mechanical) Gear selector control Brake pedal Ignition key Cigarette lighter Headlight dipper switch - direction indicators - horn - windscreen wiper/washer Accelerator pedal Control, climate control system Switch, fan control Thermostat, air conditioning* Hand throttle control Steering wheel adjustment Control lever carrier, working hydraulics Switch kick-down...
Page 254 Figure 3 Controls, control lever carrier Control lever, lifting- and lowering/floating function Control lever, tilting function Control lever, 3rd hydraulic function* Switch, kick-down Switch, engine braking Control lever lock Switch, Boom Suspension System* Switch, forward/reverse (extra)* Switch, 4th function* Switch, loud tone horn* (not factory fitted) Switch, detent function 3rd function*...
Page 255 Service Information Document Title: Function Group: Information Type: Date: "Contronic System" Service Information 2014/5/19 Profile: "Contronic System" GENERAL DESCRIPTION OF THE CONTROL UNIT (ECU) The operating programme of the machine is monitored and controlled by a preprogrammed control programme in the ECU through input information about engine speed, machine travelling speed and actions by the operator (via the gear selector control).
Page 256 Adjusting the switches to a machine code not yet defined, means that a gear approxnnot be engaged. L???? will be shown in "Initial Information" on the display. See also "Light Emitting Diode Function" and "Initial Information" under "Display Unit". LIGHT EMITTING DIODE FUNCTION When the electric current is turned on, the LED should light for approx.
Page 257 Service Information Document Title: Function Group: Information Type: Date: Contronic Display Unit Service Information 2014/5/19 Profile: Contronic Display Unit Service Contronic Display Unit The information about the monitored functions is given on the screen in the form of words and numerical values. Further information is given on the following pages.
Page 258 ALARM MESSAGES The alarm messages will be displayed on the top line regardless of the selected function group. The alarm text will be displayed for 1.5 seconds, then the selected function test will be displayed for 2 seconds and then the alarm text will be displayed again and so on.
Page 260 Figure 2 This arrow indicates how to press to move from initial display to setup.(Fig. 20 to 21) and so on Language- / unit selection Language is selected with the key. Units are selected with the Figure 3 Setup of machine hours XX = Number of hours Used for selecting the digit to be changed Used for changing the selected digit (max.
Page 261 Activated = Function activated Not activated = Function de-activated Used for activating / de-activating the function. NOTE! Should always be activated. Figure 5 Setting extended heating Activated = Function activated Not activated =Function de-activated = Used for activating/de-activating the function NOTE! Should not be activated with the basic engine TD61GD Figure 6...
Page 262 TT = Real time, time Displaying date Figure 8 Stop watch, trip meter, cycle counter XX = Time (hours, minutes, seconds) YY = Distance ZZ = Number ofF/R changes divided by 2 Time/distance/cycles is set to zero by depressing the key.
Page 263: Electrical System
XX = Time with low oil pressure YY = Time with temperature above 95 °C (203 °F) ZZ = Time with high pressure drop in air cleaner Data is reset with the key. Figure 12 Electrical system XX = System voltage YY = Time in hours with voltage above 31 V ZZ = Time i seconds with voltage above 40 V Data is reset with the...
Page 264 normal working temperature switches not actuated / in neutral Actuation of switches, signals from sensors etc. Indication because of operator action / signal according to column E. Indication: No signal in to ECU at connection according to column B. Signal in to ECU at connection according to column B. EA 17 Gear selector N Gear selector in...
Page 265 Engine started too low oil pressure EB 21 Boom Suspension function selection* EB 22 Transmission Activated switch disengagement Transmission disengagement and application of brakes, min. brake pressure 2 MPa (20 bar) (290 psi) EB 32 Sensors brake (1160 psi), 1, Brake pressure <...
Page 266 M and m can be removed by depressing the key. Figure 15 A Position on display 1 - 5, 6 - 15, 16 - 22. B Signal input / connection on the ECU. C Function D Indication with: - engine turned off - all systems without pressure - normal working temperature - switches not actuated / in neutral...
Page 267 EA 6 Preheating * When preheating is activated (activation only takes place if the engine temperature is lower than 30 °C) (86 °F)) EA 7 Solenoid limited Activated limited speed speed EA 8 Relay secondary Engine turned off steering * and actuation of test button for secondary steering...
Page 268 parking brake - too high speed in engaged gear - secondary steering activated, EA 25 Relay engine During change of power reduction travelling direction when changing at speed above 14 travelling km/h (8.7 mph) direction / engine and at engine shut down speed above 30 r/s (1800 rpm)
Page 269 EB 9 Lamp Boom Activated Boom Suspension System Suspension System Unassigned *Optional equipment Transmission XX = Gear selector position (F1, F2, F3, FA, R1, R2, R3, RA, N)  YY = Engaged gear (F1, F2, F3, F4, R1, R2, R3, R4[ 1] , N) ZZ = Temperature, or ERo/ERs when sensor circuit is faulty QQ = Main pressure, or ERo/ERs when sensor circuit is faulty...
Page 270 Figure 18 Brake test XX = Travelling speed YY = Retardation in m/s2 ZZ = Retardation constant in g- force Figure 19 See also "BRAKE SYSTEM, CHECKING FUNCTION, RETARDATION Brake test log YY = Retardation in m/s2 ZZ = Retardation constant in g- force Figure 20 NOTE! The display unit shows the values for the last 4 measured brake applications, with the latest value furthest to the left.
Page 271 Figure 21 General layout of menu arrangement [ 1]Machines provided with low gear...
Page 272: Service Information
Service Information Document Title: Function Group: Information Type: Date: General description Service Information 2014/5/19 control unit function: Profile: General description of control unit function: (Applies to both manual and automatic gear shifting) The gear positions of the control unit approxn be defined as follows: Forward gears F1, F2, F3, F4 Reverse gears...
Page 273 Service Information Document Title: Function Group: Information Type: Date: Manual gear shifting, Service Information 2014/5/19 description of function Profile: Manual gear shifting, description of function Mode selector SW143 placed in position "MAN" The gears are operated manually by moving the gear selector to the desired gear position. Changing travelling direction After the change of travelling direction the machine starts off in the earlier selected gear.
Page 274 Service Information Document Title: Function Group: Information Type: Date: Operating with Service Information 2014/5/19 disconnected Profile: Operating with ecu disconnected In approxse of a fault in the control unit, it is possible to operate / shift the machine manually after changing a couple of connectors round.
Page 275 Disconnect connector EY (blue leads) from the circuit board, see Fig. Figure 1 Change-over when operating with the ECU disconnected Disconnect connector EA (yellow) from the control unit and connect it to connector socket EZ (yellow) on the circuit board. In order to be able to remove the control unit, connectors EB and IC should also be disconnected from the control unit.
Page 276 Service Information Document Title: Function Group: Information Type: Date: Units connected to the Service Information 2014/5/19 control unit Profile: Units connected to the control unit Units connected to the control unit (see also figure [Invalid linktarget] NOTE! Units marked with an * are optional equipment. Temperature sensors (analogue) Coolant temperature Transmission oil temperature...
Page 277 Speed limiter (certain markets) (CU9) Lamps Central warning Engine oil pressure Transmission oil pressure Coolant temperature Transmission oil temperature Steering pressure Air filter Buzzer Reinforced central warning Instruments Speedometer* Coolant temperature Transmission oil temperature Fuel level Display unit (machine) Display unit for operator information* Service display unit Plug-in display unit for authorised service personnel Anslutna enheter till styrenheten (ECU)
Page 279 Figure 1 * Optional equipment Monitored functions The following functions are included in the central warning:  Engine coolant temperature  Transmission oil temperature  Engine oil pressure  Transmission oil pressure  Brake pressure  Parking brake and selected directional gear ...
Page 280 Warning lamp flashes Alarm trigger point approx. 600 rpm approx. 0.65 MPa (6.5 bar) (94 psi) approx. 1000 rpm approx. 1.2 MPa (12 bar) (174 psi) Brake pressure At a pressure below alarm trigger point, approx. 9 MPa (90 bar) (1305 psi) Central warning flashes Parking brake If the parking brake is applied and a gear is engaged while the engine is running, the central warning lamp is activated and if...
Page 281 manually. Secondary steering* Activation of pump at a too low steering pressure At a pressure below alarm trigger point: Warning lamp lights up Central warning flashes Sensor check; Engine turned off and differential pressure sensor or steering pressure sensor open: Warning lamp flashes.
Page 283 Service Information Document Title: Function Group: Information Type: Date: APS II (Automatic Power Service Information 2014/5/19 Shift with Mode Selector) Profile: APS II (Automatic Power Shift with Mode Selector) Description  L70C is as standard provided with APS II (Automatic Power Shift with Mode Selector [ 1] ), which is included in the control unit of the contronic system.
Page 284 The gears are selected manually by turning the gear selector to the desired gear position. Changing travelling direction After changing travelling direction the machine moves off in the previously selected gear. NOTE! As a safety function upshift to a higher gear takes place if certain critical engine speeds and travelling speeds are exceeded. Description of function for automatic gear shifting Mode Selector SW143 set within the "AUTOMATIC"...
Page 285 Figure 2 Mechanical operation with the ECU disconnected Forward/Reverse spool Drive position spool Security seal [ 1]APS II with mode selector SW143 on the front panel is a gear-shift programme which is adjustable to varying transporting and loading conditions.
Page 286 Service Information Document Title: Function Group: Information Type: Date: Description Service Information 2014/5/19 Profile: Description The L70B/C is provided with a hydro-mechanical, four-speed transmission with the type designation HT90. It is a Power Shift transmission, with torque converter, cylindrical spur gears and hydraulically controlled disc clutches. The transmission can also be provided with a mechanically operated low-gear range in the dropbox, which means that the number of gears is increased to eight.
Page 287 Figure 2 Transmission Suction line to transmission oil pump Oil filter Pressure control valve Sensor, input speed, engine speed Lifting points, diameter 16 mm Lifting points, M16 thread Sensor, output speed, travelling speed...
Page 288 Figure 3 Transmission Oil line (8-speed transmission) Solenoid valve (8-speed transmission) Lifting points, M16 thread Gear selector valve Distribution plate Figure 4...
Page 289 Transmission Torque converter Trimmer valve Transmission oil pump Plate, product and serial numbers Output shaft Figure 5 Transmission Output shaft Intermediate shaft 2nd idler gear shaft Clutch shaft 1st - 2nd Clutch shaft Reverse - 4th Clutch shaft Forward - 3rd Power take-off...
Page 290 Service Information Document Title: Function Group: Information Type: Date: Fault-tracing hints Service Information 2014/5/19 Profile: Fault-tracing hints The machine has poor pulling power This may be caused by the engine or the transmission Check the following:  The stall speed of the engine, see Section 2. If the stall speed is too low, the fault is probably in the engine.
Page 291 Service Information Document Title: Function Group: Information Type: Date: Transmission HT90 Service Information 2014/5/19 speed design) Profile: Transmission HT90 (8-speed design)
Page 292 Figure 1...
Page 293: Block Diagram
Service Information Document Title: Function Group: Information Type: Date: Block diagram Service Information 2014/5/19 Profile: Block diagram Neutral position, transmission no. 5563- Figure 1 Colour designation = Clutch pressure Blue = Torque converter pressure Yellow = Lubricating oil pressure Green = Atmospheric pressure...
Page 295 Service Information Document Title: Function Group: Information Type: Date: Hydraulic symbol diagram Service Information 2014/5/19 Profile: Hydraulic symbol diagram Neutral position transm. no. 5563- Figure 1 Neutral position transm. no. 5563- Checking point, main pressure (quick-action coupling) Oil tank Checking point, main pressure (quick-action coupling) Strainer...
Page 296 pressure) Torque converter Checking point, 2nd clutch Safety valve (torque Checking point, 3rd clutch converter pressure) Oil cooler Checking point, 4th clutch Pressure-limiting valve Checking point, reverse (lubricating oil pressure) clutch Lubricating oil line Checking point, forward clutch Pressure line pressure- control valve Pressure line gear selector Connection, temperature...
Page 297 Service Information Document Title: Function Group: Information Type: Date: Transmission oil pressures, Service Information 2014/5/19 checking (all) Profile: Transmission oil pressures, checking (all) Op nbr 42301 11 666 017 Pressure gauge, range 0 - 0.6 MPa (0 - 87 psi) 11 666 018 Pressure gauge, range 0 - 2.5 MPa (0 - 363 psi) 11 666 037 Hose 999 3721 Service display unit...
Page 298 Position of checking point Lubricating oil pressure, LUB P Torque converter pressure, CON P1 Main pressure, MAIN P 3. Connect a pressure gauge, start the engine and run it at high idling with the gear selector in neutral position. Read off the main pressure.
Page 299 Spring, main pressure valve yellow, (1.35 MPa) (196 psi) or red, (1.1 MPa) (160 psi) Spring, lubricating oil valve Cover Gasket Torque converter pressure, checking 6. Connect the pressure gauge on the left side of the transmission. Start the engine and run it at high idling with the gear selector in neutral position.
Page 300 Figure 3 Checking point on gear selector valve Checking point 1st gear Checking point 2nd gear Checking point 4th gear Checking point reverse gear Checking point 3rd gear Checking point forward gear 11. Check the clutch pressure for gears 1, 2, 3 and 4 forward and reverse. Start the engine and run it at high idling and read off the pressure gauge for each gear.
Page 301 Figure 4 Electrical distribution box behind wall lining 14. Check the clutch pressure for the 4th gear. Start the engine and run it at high idling and read off on the pressure gauge. Use hose 11 666 037 and pressure gauge 0 - 2.5 MPa (0 - 25 bar) (0 - 363 psi). CAUTION Service and parking brakes should be applied.
Page 302 Figure 5 Gear-shift diagram...
Page 303 Service Information Document Title: Function Group: Information Type: Date: Transmission, fitting Service Information 2014/5/19 Profile: Transmission, fitting Op nbr 42172 E616 Trolley E1687 Lifting tool Ratchet block 750 kg (1654 lb), 3 pcs Sling 1 m (3 ft), 3 pcs Member Square pipe 60x60x4 mm (2.36x2.36x0.16 in), L = approx.
Page 304 11. Fill oil in the transmission. CAUTION Check that the machine is correctly blocked so that it cannot roll forward or rearward. Figure 1 Blocking wheels 12. Start the engine, check the oil level in the transmission and check that there are no leaks. 13.
Page 305 Service Information Document Title: Function Group: Information Type: Date: Transmission, removing Service Information 2014/5/19 Profile: Transmission, removing Op nbr 42170 E616 Trolley E1687 Lifting tool Ratchet block 750 kg (1654 lb), 3 pcs Sling 1 m (3 ft), 3 pcs Member Square pipe 60x60x4 mm (2.36x2.36x0.16 in) 1.
Page 306 NOTE! Collect the oil in a suitable vessel. 3. Remove the cover plates between the cab and the frame.  4. Open the engine covers and remove the small covers and the mud guards[ 1] 5. Remove the operator seat, the operator seat bracket and the parking brake control. 6.
Page 307 Figure 4 Solenoid valve MA7 13. Raise and support the machine and remove the rear right wheel. The machine must be raised, to make it possible to get the transmission out from under the frame. Approx. 80 cm (32 in) at the edge of the guard plate, see Fig. Figure 5 Sopporting machine 14.
Page 308 Principle diagram, transmission removing and fitting Figure 7 Koppling av lyftanordning 15. Remove the bolted joint between the transmission and the flywheel housing. 16. Pull the transmission out of the flywheel housing and lower it in stages to the ground. NOTE! Make sure that none of the hydraulic hoses in front of the transmission are damaged.
Page 309 [ 2]Optional equipment...
Page 310 Service Information Document Title: Function Group: Information Type: Date: Differential carrier Service Information 2014/5/19 assembly Profile: Differential carrier assembly Figure 1...
Page 311 Figure 2 Earlier and later type Differential casing Thrust washer Differential pinion Differential side gear Thrust washer Slide bearing (only later type) Differential spider...
Page 312: Planetary Gear
Service Information Document Title: Function Group: Information Type: Date: Planetary gear Service Information 2014/5/19 Profile: Planetary gear Figure 1...
Page 313 Service Information Document Title: Function Group: Information Type: Date: Rear axle suspension, Service Information 2014/5/19 checking, fitting Profile: Rear axle suspension, checking, fitting Op nbr 46302 Ratchet block Sling Dial indicator with magnetic base 1. Move drive axle in under the machine. Connect the sling and ratchet blocks which were used for removing, see Fig. Figure 1 Ratchet block Sling...
Page 314 5. Fit the wheels. Remove the support from under the rear frame and lower the machine to the ground. 6. Refill oil in the axle housing and the hub reduction gears. 7. Test-run the machine and check the function of the brakes.
Page 315 Service Information Document Title: Function Group: Information Type: Date: Rear axle suspension, Service Information 2014/5/19 checking, removing Profile: Rear axle suspension, checking, removing Op nbr 46302 999 3722 Support 999 3757 Intermediate piece 999 3843 Adapter 999 3725 Draw bolt Ratchet block 750 kg (1654 lb) Sling Checking end float...
Page 316 Figure 2 4. Lift the axle with a jack and read off on the dial gauge. Permissible clearance +0.60 mm (+0.023 in). Removing 5. Release the pressure in the brake system by depressing the brake pedal 30 - 40 times. 6.
Page 317 Figure 3 Ratchet block Sling 10. Lift the drive axle so that the weight is taken off the oscillating bearing stud. Remove the front and rear bearing covers (save the shims) and remove the oscillating bearing stud, see Fig. Figure 4...
Page 318 Removing oscillating bearing stud 999 3722 Support 999 3757 Intermediate piece 999 3843 Adapter (not visible) 999 3725 Draw bolt 11. Lower the drive axle and pull it out from under the machine.
Page 319 Service Information Document Title: Function Group: Information Type: Date: Differential lock front, Service Information 2014/5/19 adjusting Profile: Differential lock front, adjusting Op nbr 46153 E 1370 Support 1. Lift both front wheels so they can rotate freely off the ground. Block up the front axle.
Page 320  Re-fit the cover together with a new O-ring over the thrust sleeve for the differential lock. Figure 3 Cover Thrust sleeve/washer Push rod lock screw Dog clutch half Diaphragm sleeve...
Page 322 Service Information Document Title: Function Group: Information Type: Date: Description Service Information 2014/5/21 Profile: Description Service brakes The L70B/C is provided with an all-hydraulically controlled brake system, divided into two circuits, one for the front axle and one for the rear axle respectively. The system consists of two variable displacement hydraulic pumps fitted in tandem and a central valve, foot brake valve and an accumulator block with three accumulators.
Page 323 Figure 2 Brake system (position of components) Wet disc brakes Foot brake valve Warning lamp, low brake pressure Central valve Hydraulic oil tank Hydraulic oil pump Accumulator block Parking brake...
Page 324: Description Of Function
Service Information Document Title: Function Group: Information Type: Date: Description of function Service Information 2014/5/21 Profile: Description of function Charging/unloading see hydraulic diagram [Invalid linktarget] Charging and unloading are controlled electrically via the brake charging sensor SE82 on the accumulator block and by solenoid valve MA57 on the central valve.
Page 325 Figure 2 Central valve Pressure-reducing valve Brake charging valve, MA57...
Page 326 Service Information Document Title: Function Group: Information Type: Date: Brake disc, changing Service Information 2014/5/21 Profile: Brake disc, changing Op nbr 51704 999 3875 Adjusting tool Hexagon key 14 mm NOTE! Only a 9.5 mm (0.374 in) brake disc is supplied as spare part and this means that on a machine which is not fitted with a wear indicator, such an indicator must be fitted.
Page 327 Figure 2 Axle wear indicator Wear indicator Dismantling 1. Raise the machine, support the axle and remove the wheels. 2. Drain the oil from the hub reduction gears and axle housing. 3. Release the pressure in the brake system by depressing the brake pedal 30 - 40 times, so that the hissing sound ceases and no counter pressure can be felt in the pedal.
Page 328 6. Clean, inspect and change worn or damaged parts. Figure 4 Adjusting screws with lock nuts Centring of pump rotor on brake disc 7. Remove the pump rotor from the old brake disc. 8. Centre the pump rotor on the new brake disc as follows: ...
Page 329 NOTE! Only applies when fitting wear indicator on an axle which previously did not have a built-in wear indicator. Removing and fitting brake piston, changing brake piston O-rings 9. Loosen the bleeder screw Figure 6 Loosen the bleeder screw 10. Remove the brake piston together with the springs. The brake piston weight is: approx.
Page 330 Figure 8 Changing brake piston O-rings. 12. Fit the brake piston according to Fig. The notch in brake piston, 1, must not coincide with the hole for wear indicator, 2. Tighten down the bleeder screw. Figure 9 Fitting brake piston Notch in brake piston Hole for wear indicator Basic setting of wear indicator...
Page 331 Figure 11 O-ring Brake disc with pump rotor Half shaft 16. Fit the hub reduction gear, fit and tighten down the bolts. Tightening torque: 310 N m (229 lbf ft). Figure 12 Fitting hub reduction gear 17. Fit the wear indicator which has been adjusted to the basic position.
Page 332 Figure 13 Fitting wear indicator Wear indicator 18. Tighten down the wear indicator Figure 14 Tightening wear indicator 19. Start the engine, charge the brake system until the brake warning lamp has been extinguished and apply the brakes. 20. Bleed the brakes by fitting a plastic hose on the bleeder screw. Carefully open the bleeder screw and close the bleeder screw, when oil free of air flows out.
Page 333 Figure 15 Adjusting screws with lock nuts CAUTION The brakes should be applied during the adjustment and must not be released until the adjusting tool 3875 has been removed. Adjusting wear indicator 22. Adjust the wear indicator by fitting adjusting tool 3875 and tightening it until it bottoms. Figure 16 Adjust the wear indicator 3875...
Page 334 Figure 17 Tighten down the plug 25. Fill the axle housing and hub reduction gears with oil. 26. Fit the wheels and remove any supports.
Page 335: Service Information
Service Information Document Title: Function Group: Information Type: Date: Brake discs, checking wear, Service Information 2014/5/21 L70C up to incl. ser. no. - 13501 Profile: Brake discs, checking wear, L70C up to incl. ser. no. - 13501 Op nbr 51601 999 3789 Depth gauge The following applies when checking: Temperature:...
Page 336 Figure 2 Checking brake disc wear Platte 3. Check the brake disc wear by establishing how far pin 1 protrudes above surface 2. The surface is marked "CHANGE" and "STOP". If the flat surface of the pin is flush with the plate surface marked "CHANGE" or "STOP", the brake disc must be changed, see Fig.
Page 337: Wear Indicator
Service Information Document Title: Function Group: Information Type: Date: Brake discs, checking wear, Service Information 2014/5/21 L70C w.e.fr. ser. no. 13502 - axle<br />with built-in wear indicator Profile: Brake discs, checking wear, L70C w.e.fr. ser. no. 13502 - axle Op nbr 51701 The following applies when checking: Temperature: Normal working temperature...
Page 338: Figure 2
Figure 2 Press in wear indicator pin 4. The wear of the brake disc is indicated by the position of the flat surface of pin B relative to the flat surface A of the nipple. The position of the flat surface of the pin, varies depending on the brake disc wear. With a new brake disc the flat surface of the pin protrudes 2.3 mm (0.091 in) outside the flat surface of the nipple, see Fig.
Page 339 Service Information Document Title: Function Group: Information Type: Date: Brake disc, changing Service Information 2014/5/21 Profile: Brake disc, changing Op nbr 51704 999 3875 Adjusting tool Hexagon key 14 mm NOTE! Only a 9.5 mm (0.374 in) brake disc is supplied as spare part and this means that on a machine which is not fitted with a wear indicator, such an indicator must be fitted.
Page 340 Figure 2 Axle wear indicator Wear indicator Dismantling 1. Raise the machine, support the axle and remove the wheels. 2. Drain the oil from the hub reduction gears and axle housing. 3. Release the pressure in the brake system by depressing the brake pedal 30 - 40 times, so that the hissing sound ceases and no counter pressure can be felt in the pedal.
Page 341 6. Clean, inspect and change worn or damaged parts. Figure 4 Adjusting screws with lock nuts Centring of pump rotor on brake disc 7. Remove the pump rotor from the old brake disc. 8. Centre the pump rotor on the new brake disc as follows: ...
Page 342 NOTE! Only applies when fitting wear indicator on an axle which previously did not have a built-in wear indicator. Removing and fitting brake piston, changing brake piston O-rings 9. Loosen the bleeder screw Figure 6 Loosen the bleeder screw 10. Remove the brake piston together with the springs. The brake piston weight is: approx.
Page 343 Figure 8 Changing brake piston O-rings. 12. Fit the brake piston according to Fig. The notch in brake piston, 1, must not coincide with the hole for wear indicator, 2. Tighten down the bleeder screw. Figure 9 Fitting brake piston Notch in brake piston Hole for wear indicator Basic setting of wear indicator...
Page 344 Figure 11 O-ring Brake disc with pump rotor Half shaft 16. Fit the hub reduction gear, fit and tighten down the bolts. Tightening torque: 310 N m (229 lbf ft). Figure 12 Fitting hub reduction gear 17. Fit the wear indicator which has been adjusted to the basic position.
Page 345: Start The Engine, Charge The Brake System Until The Brake Warning Lamp Has Been Extinguished And Apply The Brakes
Figure 13 Fitting wear indicator Wear indicator 18. Tighten down the wear indicator Figure 14 Tightening wear indicator 19. Start the engine, charge the brake system until the brake warning lamp has been extinguished and apply the brakes. 20. Bleed the brakes by fitting a plastic hose on the bleeder screw. Carefully open the bleeder screw and close the bleeder screw, when oil free of air flows out.
Page 346 Figure 15 Adjusting screws with lock nuts CAUTION The brakes should be applied during the adjustment and must not be released until the adjusting tool 3875 has been removed. Adjusting wear indicator 22. Adjust the wear indicator by fitting adjusting tool 3875 and tightening it until it bottoms. Figure 16 Adjust the wear indicator 3875...
Page 347 Figure 17 Tighten down the plug 25. Fill the axle housing and hub reduction gears with oil. 26. Fit the wheels and remove any supports.
Page 348 Service Information Document Title: Function Group: Information Type: Date: Brake discs, checking wear, Service Information 2014/5/21 L70C up to incl. ser. no. - 13501 Profile: Brake discs, checking wear, L70C up to incl. ser. no. - 13501 Op nbr 51701 999 3789 Depth gauge The following applies when checking: Temperature:...
Page 349 Figure 2 Checking brake disc wear Platte 3. Check the brake disc wear by establishing how far pin 1 protrudes above surface 2. The surface is marked "CHANGE" and "STOP". If the flat surface of the pin is flush with the plate surface marked "CHANGE" or "STOP", the brake disc must be changed, see Fig.
Page 350 Service Information Document Title: Function Group: Information Type: Date: Brake discs, checking wear, Service Information 2014/5/21 L70C w.e.fr. ser. no. 13502 - axle<br />with built-in wear indicator Profile: Brake discs, checking wear, L70C w.e.fr. ser. no. 13502 - axle Op nbr 51701 The following applies when checking: Temperature: Normal working temperature...
Page 351 Figure 2 Press in wear indicator pin 4. The wear of the brake disc is indicated by the position of the flat surface of pin B relative to the flat surface A of the nipple. The position of the flat surface of the pin, varies depending on the brake disc wear. With a new brake disc the flat surface of the pin protrudes 2.3 mm (0.091 in) outside the flat surface of the nipple, see Fig.
Page 352 Service Information Document Title: Function Group: Information Type: Date: Brake system, checking Service Information 2014/5/21 function of hydraulics Profile: Brake system, checking function of hydraulics Op nbr 52001 11 666 003 Pressure gauge 0 - 40 MPa (0 - 5800 psi) 11 666 020 Pressure gauge 0 - 25 MPa (0 - 3626 psi) 11 666 037 Hose The following applies when checking:...
Page 353 Figure 1 Control valve Hose 11 666 037 with pressure gauge 0 – 40 MPa (0 – 5800 psi) Figure 2 Accumulator block Hose 11 666 037 with 11 666 020 pressure gauge 0 – 25 MPa (0 – 3626 psi) Adjusting, working range for brake charging sensor SE82.
Page 354  Start the engine and read off the pressure gauge connected to the control valve.  The pressure gauge should show 16.5 MPa (2393 psi) during approx. 4 seconds and then show the stand- by pressure for the hydraulic pump. If the pressure gauge shows a higher or a lower pressure than 16.5 MPa (2393 psi), the pressure-reducing valve should be adjusted, see Fig.
Page 355 Figure 4 Brake pressur valvel 7. Apply the brakes a few times with the engine running at low idling. When the pressure has been reduced to 12.0 ± 0.3 MPa (1740 ± 44 psi), the electrical brake charging sensor SE82 should, by means of the brake charging valve, connect the hydraulic pump, so that the pressure rises to 13.7 ±...
Page 356  If the precharging pressure in any of the accumulators drops below 3.5 MPa (508 psi) it should be changed. Front and rear accumulator, checking 10. Provided that the precharging pressure of the accumulator in common is within the specified range (see note in point 6), it is possible to check the front and rear accumulators as follows: ...
Page 357 Figure 6 Checking pressure in rear brake circuit Hose 11 666 037 with pressure gauge 0 – 25 MPa (0 – 3626 psi)  Start the engine and charge up the brake pressure. Stop the engine.  Release the brake pressure by depressing the brake pedal approx. 30 - 40 times. The output brake pressure now drops sloLy when braking.
Page 358 Service Information Document Title: Function Group: Information Type: Date: Brake system, checking Service Information 2014/5/21 function of retardation Profile: Brake system, checking function of retardation Op nbr 52002 999 3721 Service display unit The following applies when checking:  The machine should be empty. ...
Page 359 Figure 2 Turn the gear selector control to position A (Automatic). Operate the machine at a speed which exceeds 20 km/h (12.4 mph). 6. If the menu for brake test is selected, when the travelling speed exceeds 20 km/h the buzzer will give off a short signal and the brake test can then be carried out.
Page 360 Service Information Document Title: Function Group: Information Type: Date: Pressure in circuit, checking Service Information 2014/5/21 and adjusting Profile: Pressure in circuit, checking and adjusting Op nbr 52005 Pressure gauge 0 - 25 MPa (0 - 3626 psi) 11 666 037 Hose The following applies when checking: Temperature: Normal working temperature...
Page 361 Figure 1 Checking pressure in front brake circuit Hose 11 666 037 with pressure gauge 11 666 020 Figure 2 Checking pressure in rear brake circuit Hose 11 666 037 with pressure gauge 11 666 020 2. Depress the brake pedal until it stops against the adjusting screw, see Fig. At the same time check that the pressure does not exceed 8.6 MPa (1247 psi).
Page 362 Figure 3 Adjusting screw for output brake pressure Stop light Sensor, SE29 Sensor SE2, transmission disengaging Adjusting 3. Adjust the pressure in the circuit as follows: Figure 3  Remove the security seal from the adjusting screw, see Fig.  Adjust the pressure in the brake circuit by limiting the pedal angle with the aid of the adjusting screw.
Page 363 Service Information Document Title: Function Group: Information Type: Date: Hydraulic diagram, brake Service Information 2014/5/21 system Profile: Hydraulic diagram, brake system...
Page 364 Figure 1 Hydraulic diagram, brake system...
Page 365 Front brake circuit, front axle Rear brake circuit, rear axle Foot brake valve Accumulator block, 0.5 litre (30.5 in3) accumulators, 3 pcs Central valve Brake pressure valve Pressure-reducing valve Return block (under the cab) Hydraulic oil cooler with by-pass valve Transmission disengaging SE14 Brake pressure sensor...
Page 366: Description Of Function
Service Information Document Title: Function Group: Information Type: Date: Description of function Service Information 2014/5/21 Profile: Description of function Foot brake valve The foot brake valve is of the proportional type which means that the output brake pressure is proportional to the angle of the pedal.
Page 367 Service Information Document Title: Function Group: Information Type: Date: Foot brake pedal, adjusting Service Information 2014/5/21 angle Profile: Foot brake pedal, adjusting angle Adjusting pedal angle The pedal can be adjusted to an angle of 40 °, 45 °, 50 ° and 55 °. The pedal angle is adjusted by moving the screw under the pedal.
Page 368 Service Information Document Title: Function Group: Information Type: Date: Foot brake valve removed, Service Information 2014/5/21 reconditioning Profile: Foot brake valve removed, reconditioning Op nbr 52509 Dismantling NOTE! The sleeve item 2 and the screw item 5 are locked with locking fluid. 1.
Page 369 3. Remove the springs and spring guide item 3. Remove the valve housing from the vice. NOTE! Take care so that the parts in the valve do not drop out. 4. Take pin item 4 out of sleeve item 2. Wrap a rag around the pin and secure it in a vice. Remove screw item 5 for the upper spring guide 15.
Page 370 Figure 2 Placering av tätningsring 9. Fit support rings item 7 and scraper ring item 6. Fill the space between the scraper ring and the support ring with grease. 10. Insert pin item 4 in sleeve item 2 with the threaded end upward, in order to further fix the seal. Take the pin out of the sleeve and insert it from above with the threaded end downward.
Page 371 Service Information Document Title: Function Group: Information Type: Date: Description Service Information 2014/5/21 Profile: Description The parking brake is a mechanically controlled drum brake positioned on the front axle pinion drive flange for the propeller shaft. Figure 1 Central valve...
Page 372: Parking Brake, Adjusting
Service Information Document Title: Function Group: Information Type: Date: Parking brake, adjusting Service Information 2014/5/21 Profile: Parking brake, adjusting Op nbr 55002 E 1370 Support WARNING Place the machine on level ground and put blocks in front of and behind the wheels, in order to prevent the machine from rolling.
Page 373 Fit the locking pin. Figure 2 Checking adjustment of parking brake handle Adjusting nut 4. Fit the rubber mat over the parking brake control. 5. Remove support and blocks. 6. Start the engine and check that the parking brake can keep the machine stationary in 3rd gear with the accelerator pressed down fully.
Page 375 Service Information Document Title: Function Group: Information Type: Date: Description Service Information 2014/5/21 Profile: Description The L70B/L70C is provided with hydrostatic articulated frame steering consisting of two variable displacement hydraulic pumps connected in parallel, central valve, steering valve (ORBITROL) and two cylinders. The outlet ports of the steering valve are connected to the steering cylinder piston and piston rod ends respectively.
Page 376 Service Information Document Title: Function Group: Information Type: Date: Hydraulic diagram, stering Service Information 2014/5/21 system Profile: Hydraulic diagram, stering system...
Page 378 Figure 1 Hydraulic diagram, steering system basic machine Hydraulic oil tank Hydraulic oil pump 2 pcs Central valve Pilot-controlled pressure-reducing spool Pilot valve for max. steering pressure, 21 MPa (3046 psi) Steering valve (ORBITROL) Valve block with shock and anti-cavitation valves, 28 ± 0.5 MPa (4061 ± 73 psi) Steering cylinders Back-up valve for return pressure, 0.6 MPa (87 psi) (positioned by hydraulic oil tank) Return oil filter...
Page 380 Figure 2 Hydraulic diagram, steering system...
Page 381 Basic machine Lever steering (CDC *) Secondary steering Hydraulic oil tank Hydraulic oil pumps, 2 pcs Central valve Pilot-controlled pressure-reducing spool Pilot valve for max. steering pressure, 21 MPa (3046 psi) Steering valve (ORBITROL) Valve block with shock and anti-cavitation valves 28 ±0.5 MPa (4061 ±73 psi) Steering cylinders Back-up valve for return pressure 0.6 MPa (87 psi)
Page 382: Service Information
Service Information Document Title: Function Group: Information Type: Date: Control valve Service Information 2014/5/21 Profile: Control valve Description When the steering lever is actuated, an electrical signal is passed via ramp generators CU20 or CU22 to control unit 25 on the control valve (11 volts or lower for steering to the left, 13 volts or higher for steering to the right), see also Fig.
Page 383 Figure 2 Ramp generator CU20/CU22 circuit board When the spool has taken up the position which corresponds to the signal to the control unit, the control unit interrupts the feed to solenoid valves 21 or 23 depending on the steering direction. On the control unit of the control valve there is a light-emitting diode 28 which gives off a green light when steering.
Page 384 Figure 4 Adjusting screws for steering speed Steering to the left Steering to the right...
Page 385 Basic setting of steering speed at 1500 rpm 3.5 - 4.0 secondsbetween full steering locks. Clockwise adjustment will increase the speed Counter-clockwise adjustment will reduced the speed Figure 5 Control valve, lever steering Pressure-reducing valve Control spool...
Page 386 Anti-cavitation valves Pressure-limiting valves, blocked Non-return valve...
Page 387: Hydraulic Pump
Service Information Document Title: Function Group: Information Type: Date: Hydraulic pump Service Information 2014/5/21 Profile: Hydraulic pump Figure 1 Figure 2 Figure 3 see fig Figure 1 The pump is a nine-cylinder axial piston pump with variable flow. The principle for such a pump is shown in Fig. Drive shaft 9 turns taking with it cylinder block 6, pistons 7 and swash plate 8.
Page 388 Figure 2 see Fig The purpose of the flow compensator is always to control the pump via control piston 8 and spring 7, Fig, so that the pump supplies an oil flow, the pressure drop of which in the system corresponds to a set pressure difference between the pump outlet and the load-sensing port on the compensator.
Page 389 Figure 3 Central valve Adjusting, steering pressure...
Page 390 Service Information Document Title: Function Group: Information Type: Date: Lever steering Service Information 2014/5/21 Profile: Lever steering Hydraulic system, description, see diagram Figure 1 Hydraulic pump Outlet port Outlet groove in distribution plate Inlet port Inlet groove in distribution plate Distribution plate Cylinder block Piston...
Page 391 Service Information Document Title: Function Group: Information Type: Date: Lever steering, CDC Service Information 2014/5/21 Profile: Lever steering, CDC Description of function The equipment is connected to the circuit board through connector OD. With ignition key in position 1 and the arm rest folded down current is obtained at switch SW30 via fuse FU29, sensor SE62 and relay RE30 (30 - 87A).
Page 392 Figure 1 Ramp generator CU20 / CU22 Start damping left Stop damping left Start damping right Stop damping right Ramp generator CU20 / CU22 With the aid of the ramp generator a more comfortable steering is obtained in that the signal to MA28 is dampened both at the beginning and the stop of the steering movement.
Page 394 Figure 3 Wiring diagram, lever steering CU20...
Page 395 Figure 4 Wiring diagram CU22 Forward or reverse selection, see also description in Section 4. With the ignition switch in position 1, the arm rest lowered and lever steering connected current is obtained at switch SW43 via fuse FU29, sensor SE62, relay RE30 (30 - 87A) relay RE31 (30 - 87) and diode DI2:20.
Page 396 Selecting forward drive If switch SW43 is moved to position F (forward), current is obtained at ECU terminal EA17 and at the coil in relay RE11 which is activated. Selecting reverse drive If switch SW43 is moved to position R (reverse), current is obtained at ECU terminal EA18 and at the coil in relay RE11 which is activated.
Page 397: Service Information
Service Information Document Title: Function Group: Information Type: Date: Lever steering, Service Information 2014/5/21 (Comfort Drive Control) Profile: Lever steering, CDC (Comfort Drive Control) General description This equipment means that steering, forward - reverse selection and engagement of kick-down can be operated via controls positioned in the left arm rest, see Fig.
Page 398 Figure 2 MA28, CDC...
Page 400 Figure 3 Hydraulic diagram, steering system...
Page 401 Basic machine Lever steering (CDC *) Secondary steering Hydraulic oil tank Hydraulic oil pumps, 2 pcs Central valve Pilot-controlled pressure-reducing spool Pilot valve for max. steering pressure, 21 MPa (3046 psi) Steering valve (ORBITROL) Valve block with shock and anti-cavitation valves 28 ±0.5 MPa (4061 ±73 psi) Steering cylinders Back-up valve for return pressure 0.6 MPa (87 psi)
Page 402 is selected. Also select gear-shift mode (programme) with mode selector SW143, see, APS II (Automatic Power Shift with Mode Selector) 4th gear is blocked when the lever steering is connected. The lever steering is now connected with switch SW30 on the arm rest. The green control lamp LC 79 on the left panel should light.
Page 403 Service Information Document Title: Function Group: Information Type: Date: Secondary steering system Service Information 2014/5/21 Profile: Secondary steering system Description see diagram [Invalid linktarget] The system includes an electrically powered hydraulic pump MO7, which is controlled by the ECU via RE41. The position of the pump is shown in Fig.
Page 404 SE51 Differential pressure sensor SE15 Flow sensor Before starting engine If test switch SW67, flow and differential pressure sensor SE51 or pressure sensor SE15 are connected, the ECU considers that the equipment is installed. The ECU checks the sensor circuits. With the engine turned off and the ignition switch in the running position, control lamp LC14 flashes if any of the sensor circuits are open.
Page 406 Figure 4 Wiring diagram, secondary steering system Function, secondary steering Valve with flow and differential pressure sensor SE51, see also hydraulic diagrams. The valve and the functional diagram show the situation before starting. Before starting, valve cone 1 is kept in the closed position by spring 5 via guide 4 and piston 2. At the same time the guide holds pin 3 pushed in, which means that sensor SE51 is closed.
Page 407 difference between the steering pressure and the LS-pressure. At connection PU there is either stand-by pressure or steering pressure. The pressure actuates piston 2 which is pressed against guide 4, pin 3 and spring 5. The LS-pressure enters the valve via connection LS and strives to press the piston in the opposite direction.
Page 408 Figure 6 Valve with flow and pressure diagram and functional diagram Figure 7 Wiring diagram, operating with the ECU disconnected...
Page 410: Steering Cylinder
Service Information Document Title: Function Group: Information Type: Date: Steering cylinder Service Information 2014/5/21 Profile: Steering cylinder Figure 1 Steering cylinder Piston seal Bakelite bushings O-ring with support ring O-ring Seal Scraper seal...
Page 412 Service Information Document Title: Function Group: Information Type: Date: Steering cylinder removed, Service Information 2014/5/21 reconditioning Profile: Steering cylinder removed, reconditioning Op nbr 64506 9993725 Draw bolt 9993722 Support 9993712 Sleeve 9993714 Draw bolt 9993717 Quick nut 9993686 Plate 11667060 Drift plate 11667050 Drift plate Hook spanner Removing...
Page 413 3. Remove the lock ring for the front pin of the steering cylinder. Carefully clean the part of the pin which protrudes from the piston rod clevis. Remove the pin with the aid of draw bolt 3725 and support 3722. Figure 2 Removing front pin 4.
Page 414 Removing rear pin Dismantling 6. Position the steering cylinder in a vice. Use soft protective jaws in order not to deform the cylinder. 7. Loosen the piston rod guide with a Beltzer 4130 hook spanner and pull out the piston rod from the cylinder. Collect the oil in the cylinder in a suitable vessel.
Page 415 If the previous holes through the piston and piston rod do not align within the prescribed torque, the piston must not be reversed, but instead a new hole should be drilled for locking the two parts together with the spring pin. Figure 6 Fitting link bearing and lock rings 14.
Page 416 Figure 7 Attaching steering valve in vice Fitting 17. Lift the steering cylinder into the frame, fit the link bearing seals and align the cylinder with the hole in the frame. 18. Fit the pin, see Fig. using plate 3686 and draw bolts 3714 and 3725. Figure 8 Attaching steering valve in vice 19.
Page 417 Figure 9 Fitting rear pin 21. Fit the grease nipple in the pin. 22. Connect the hydraulic hoses to the steering cylinder. Connect the lubrication pipe to the rear steering cylinder pin. Lubricate the pins. Figure 10 Fitting front pin 23.
Page 418 Service Information Document Title: Function Group: Information Type: Date: Steering valve orbitrol Service Information 2014/5/21 Profile: Steering valve orbitrol The steering valve with designation OSPL 500 - LS is of the non-reaction type with closed centre. The "500" in the designation indicates that it supplies 500 cm3 of oil for each turn of the steering wheel.
Page 419 Figure 2 Figure 3 Steering valve, OSPLFor the item numbers see Fig. Earlier type seal Later type seal Stamped-in marking, week/year e.g. 416 (week 41 year 1996)
Page 420 Figure 3 Steering valve Seal Valve housing O-ring / support ring Axial disc Needle bearing Bearing race Ring (holder) Inner valve spool Outer valve spool Cross pin Leaf springs (4 pcs) Rotor shaft Ball (non-return valve) Bushing O-ring Distributor plate O-ring Distributor plate Rotor...
Page 421 Nr 19 and 20 = metering unit FUNCTION Figure 4 Figure 5 Figure 6 Figure 4 Neutral position (Fig. Steering valve 7 is in neutral position. LS-line 8 is then without pressure. Pressure is built up in outlet line 10 and pressure line 11.
Page 422 Flow compensator Pressure compensator, working hydraulics Pump 1 Central valve, simplified Pilot-controlled pressure-reducing spool Pilot valve for max. steering pressure Steering valve Load-sensing line LS Pressure back-up valve Outlet line Pressure line Pressure compensator spool Spring Flow compensator spool Spring (2 pcs) Control piston Spring Adjusting screw, stand-by pressure...
Page 423 Figure 5 Steering, normal Oil under Pressure Blue Raised return pressure Green Return, without pressure Pilot-controlled pressure-reducing spool Steering valve Outlet Line Flow compensator spool Spring Pump 1 Steering against end position Figure 6 When the pressure in the LS-line rises to max. steering pressure, pilot valve 6 opens. When this occurs, pressure-reducing spool 5 closes and cuts off the flow up to steering valve 7.
Page 424 Oil under pressure Pink LS-pressure Blue Raised return pressure Green Return, no pressure Pilot-controlled pressure-reducing spool Pilot valve for max. steering pressure Steering valve Flow compensator spool Control piston Pump 1...
Page 425 Service Information Document Title: Function Group: Information Type: Date: Steeering valve, removed, Service Information 2014/5/21 reconditioning Profile: Steeering valve, removed, reconditioning Op nbr 64581 999 3460 Fitting tool 6 999 007 Handle 999025 Plate 6 999 034 Plate Dismantling 1. Mark the parts of the steering valve relative to each other in order to facilitate assembling. Secure the steering valve in a vice.
Page 426 Figure 2 Removing rotor set 3. Remove the cross pin. Remove the steering valve from the vice and take out the ball, see Fig. Figure 3 Removing ball 4. Remove the inner and outer spools, see Fig.
Page 427 Figure 4 Removing inner and outer spools 5. Remove the axial disc, the needle bearing, the bearing race and ring, see Fig. Figure 5 Removing needle bearing and ring 6. Remove inner and outer seals. 7. Carefully press the inner spool out of the outer. Remove the leaf springs. Clean and inspect as regards damage and wear.
Page 428 Figure 6 Fitting oil seal 6 999 007 6 999 025, 6 999 034 Figure 7 9. Position the assembled seal on the spindle of the tool, see Fig. Insert the spindle of the tool in the sleeve, see Fig.Hold the sleeve and pull out the spindle while twisting. Remove the sleeve and check that the seal lies Figure 8 correctly.
Page 429 Figure 8 Position of seal on tool Figure 9 Fitting seal, later type 999 3460...
Page 430 Figure 10 Steering valve, OSPLFor the item numbers see Fig. [Invalid linktarget] Earlier type seal Later type seal Stamped-in marking, week/year e.g. 416 (week 41 year 1996) Later type seal. 11. Position the assembled seal on the drift plate and press in the seal in the housing, see Fig. Figure 11 Fitting seal, later type 6 999 025...
Page 431 º relative to face "A", see Fig. Figure 12 T-shaped groove (inner spool) Hole (outer spool) 13. Fit the leaf springs, see fig. Figure 13 Position of leaf spring 14. Fit the axial disc, the needle bearing, the bearing race and ring on the inner and outer spools, see Fig. NOTE! Fit the bearing race with the chamfer towards the inner spool.
Page 432 Ring Bearing race Needle bearing Axial disc 15. Fit the inner and outer spools in the valve housing. Rotate the inner and outer spools so that their cross pin is at 90 º relative to face "A", see Fig. CAUTION If the inner and outer spools are incorrectly positioned, the steering valve may function as a motor and this would cause the machine to self steer.
Page 433 Figure 17 Position of rotor set relative to valve housing 18. Fit the cover and the bolts. Fit the ball and then fit the screw with the locking pin, see Fig Tighten the bolts crosswise to 30 - 35 N m (22 - 26 lbf ft). Figure 18 Position of ball valve housing...
Page 434 Service Information Document Title: Function Group: Information Type: Date: Steering lever cu3, Service Information 2014/5/21 checking voltage in/out Profile: Steering lever cu3, checking voltage in/out Op nbr 1. Lower the arm rest and remove the plastic casing and the aluminium cover. 2.
Page 435 Figure 1 Adjusting screws for steering speed Steering to the left Steering to the right Basic setting of steering speed at 1500 rpm 3.5 - 4.0 secondsbetween full steering locks.
Page 436 Clockwise adjustment will increase the speed Counter-clockwise adjustment will reduced the speed 5. Check the output signal from the ramp generator CU20/CU22 in yellow lead (412A). Measure at connection 9 on the ramp generator or at connection 2 on MA28. Quickly move the lever to the right and check that a damping of the signal is obtained.
Page 437 Stop damping left Start damping right Stop damping right...
Page 438: Service Information
Service Information Document Title: Function Group: Information Type: Date: Steering pressure Service Information 2014/5/21 stand-by pressure, checking and adjusting Profile: Steering pressure and stand-by pressure, checking and adjusting Op nbr 64515 11 666 020 Pressure gauge, 0 - 25 MPa (0-3626 psi) 11 666 037 Hose The following applies when checking: ...
Page 439 Figure 2 Central valve Adjusting, steering pressure Checking stand-by pressure 4. Connect a pressure gauge (0 - 25 MPa) (0 - 3626 psi) according to Fig. to the pressure outlet on the control valve. Start the engine and run it at low idling speed. Figure 3 Checking stand-by pressure 11666 037 Hose with 11666 020 Pressure gauge...
Page 440 Adjusting 6. Any adjustments are carried out with the adjusting screw on the pressure compensator of the respective pump as follows, see Fig. Figure 4 Hydraulic pump Adjusting, stand-by pressure 7. Screw off the protective caps for the adjusting screws. Loosen the lock nuts and screw out both adjusting screws approx.
Page 442: General Description
Service Information Document Title: Function Group: Information Type: Date: General description Service Information 2014/5/21 Profile: General description The front frame is made up as an open box section. It supports the loader unit and carries the front axle. The rear frame consists of two frame members which are of a closed box design. The rear frame carries the cab, engine and components for the power transmission.
Page 443 Service Information Document Title: Function Group: Information Type: Date: Frame joint, changing Service Information 2014/5/21 bearings Profile: Frame joint, changing bearings Op nbr 74136 11667 130 Drift plate 11667 110 Drift plate 11667 001 Handle 11666 030 Pump 999 3714 Draw bolt 999 3735 Intermediate piece 999 3722 Support 11666 014 Jack...
Page 444 Figure 2 Securing frame parts with traverse hoist and jacks Traverse hoist Jack, rear frame part Jack, front frame part 5. Detach the hydraulic lines and the electrical leads. 6. Pull out the upper pin. Figure 3 Removing upper pin 999 3722 Support 11666 014 Jack with pump 11666 030 999 3714 Draw bolt...
Page 445 7. Pull out the lower pin. Figure 4 Removing the lower pin 999 3722 Support 11666 014 Jack with pump 11666 030 999 3714 Draw bolt 999 3735 Intermediate piece M30-M20 8. Separate the parts of the machine. Fitting 9. Fit oil seals in the covers. NOTE! The oil seal in the upper cover should have the sealing lip upward.
Page 446 13. Fit the bearing cover and tighten the bolts alternately while checking the rolling resistance of the bearing pack. Adjust when necessary: At a too large rolling resistance, fit more shims. At a too small rolling resistance, fir fewer shims. Tightening torque: Bearing covers bolts 75 - 95 N m (7.5 - 9.5 kgf m) (55 - 70 lbf ft).
Page 447 Figure 5 Upper frame joint bearing...
Page 449 Service Information Document Title: Function Group: Information Type: Date: Description Service Information 2014/5/21 Profile: Description The machine is provided with a climate control system which can be complemented with air conditioning (AC). All controls for the climate control system are positioned by the right instrument panel, see Fig. Figure 1 Recirculation control Temperature control...
Page 450 Figure 3 air in the cab is discharged through a one-way outlet fitted with slats and placed in the cab door, see Fig . In order to open the slats a certain degree of excess pressure in the cab is required. The higher pressure inside the cab contributes to keeping the cab free of dust.
Page 451 Figure 3 Cab, air outlet...
Page 452: Electrical System, Description Of Function
Service Information Document Title: Function Group: Information Type: Date: Electrical system, Service Information 2014/5/21 Description of function Profile: Electrical system, Description of function Figure 1 see wiring diagram The cab fan MO1 is switched on with switch SW6. The air conditioning is switched on with switch SW7. When SW7 is switched on, SW6 obtains supply.
Page 454 Figure 1 Wiring diagram Capacitors Fuse, climate control system Switch, cab fans Switch, air conditioning Cab Fan SE21 Thermostat SE22 Pressure monitor RE44 Relay, AC safety RE48 Relay, AC safety DI1.30 Quenching diode for MA17...
Page 455: See Wiring Diagram Figure
Service Information Document Title: Function Group: Information Type: Date: AC safety, Description of Service Information 2014/5/21 function Profile: AC safety, Description of function Figure 1 see wiring diagram If the pressure in the system becomes too high, above 2.2 - 2.3 MPa (22 - 23 bar) (319 - 334 psi), or too low below 0.2 - 0.3 MPa (2 - 3 bar) (29 - 44 psi), SE22 interrupts the control current to RE44 which is deactivated, so that the feed to MA17 and RE48 (connection 85) is interrupted.
Page 457 Figure 1 Elschema, klimatanläggning Capacitors Fuse, climate control system Switch, cab fans Switch, air conditioning Cab Fan SE21 Thermostat SE22 Pressure monitor RE44 Relay, AC safety RE48 Relay, AC safety DI1.30 Quenching diode for MA17...
Page 458 Service Information Document Title: Function Group: Information Type: Date: conditioning with Service Information 2014/5/21 refrigerant R134a Profile: Air conditioning with refrigerant R134a Principal differences as compared with air conditioning with refrigerant R12. Expansion valve, (has no separate pressure equaliser pipe). Evaporator.
Page 459 Air conditioning, (principle diagram) Service, viewpoints:  Service valves are positioned together by the evaporator, (quick-action couplings).  Safety valve on the high-pressure side.  There is no sight glass, which means that the only possibility of achieving the correct amount when filling refrigerant R134a is using weighing scales.
Page 460 Service Information Document Title: Function Group: Information Type: Date: Description of function Service Information 2014/5/21 Profile: Description of function Figure 1 Side view of air conditioning Evaporator Expansion valve Service valves for filling/emptying, checking pressure The air conditioning is filled with a refrigerant R134a which is pumped around in the system by the compressor. When the air conditioning is started, the evaporator becomes cold and the air which passes through the evaporator core is cooled.
Page 461 Figure 2 Figure 3 Air conditioning, position of components Compressor Safety valve Receiver drier with pressure monitor Condenser (hinged)
Page 463 Service Information Document Title: Function Group: Information Type: Date: Central valve, description Service Information 2014/5/21 Profile: Central valve, description The central valve distributes pressure and flow out to the steering, brakes, servo and working hydraulics. The central valve is positioned on the inside of the rear frame on the right side under the cab. The brake pressure, steering pressure and servo pressure can be adjusted on the central valve.
Page 464 Figure 1 Central valve, principle diagram Pressure build-up of brake system simultaneously with steering. = Oil under pressure Green = Return oil, without pressure Pale pink = LS-pressure, steering Pink = Brake pressure Orange = Servo pressure...
Page 465 Figure 2 Central valve, sectional view...
Page 466 Service Information Document Title: Function Group: Information Type: Date: Working hydraulics, Service Information 2014/5/21 description Profile: Working hydraulics, description The L70B/L70C is provided with load-sensing hydraulics. The working hydraulicsconsists mainly of the following components: oil tank, central valve, two variable pumps connected in parallel, servo valve, control valve, solenoid valves, oil cooler and control cylinders.
Page 467 Figure 1 Hydraulic system, principle diagram Pump 1 Pump 2...
Page 468 Figure 2 Hydraulic system, working hydraulics Tilting cylinder Lifting cylinders Servo valve Hydraulic oil tank Oil cooler Hydraulic oil pump Central valve Control valve [ 1]Optional equipment...
Page 469: Hydraulic Diagram
Service Information Document Title: Function Group: Information Type: Date: Hydraulic diagram Service Information 2014/5/21 Profile: Hydraulic diagram Hydraulic diagram L70C, – 12829...
Page 471 Figure 1 Hydraulic oil tank Hydraulic oil pump 2 pcs Central valve MA57, brake pressure charging Servo valve Control valve Return oil block Oil cooler Solenoid valve block MA51, separate attachment lock By-pass valve for oil cooler Hydraulic diagram L70C, 12830–...
Page 472 Figure 2...
Page 473 Hydraulic oil tank Hydraulic oil pump 2 pcs Central valve MA57, brake pressure charging Servo valve Control valve Return oil block  Oil cooler, 2 pcs[ 1] Solenoid valve block MA51, separate attachment lock By-pass valve for oil cooler Hydraulic diagram L70C, 12341 –...
Page 474 Figure 3...
Page 475 Hydraulic oil tank Hydraulic oil pump, 2 pcs Central valve MA57, brake pressure charging Servo valve Control valve Return oil block Oil cooler Solenoid valve block MA36, 4th function MA48, Pressure draining 3rd and 4th functions MA51, separate attachment lock MA85, LS-signal 4th function Accumulator 14 bar (203 psi), (load lowering equipment) Other solenoid valves in hydraulic diagram...
Page 476 Figure 4 Hydraulic oil tank...
Page 477 Hydraulic oil pump, 2 pcs Central valve MA57, brake pressure charging Servo valve Control valve Return oil block  Oil cooler, 2 pcs[ 2] Solenoid valve block MA36, 4th function MA48, Pressure draining 3rd and 4th functions MA51, separate attachment lock MA85, LS-signal 4th function Accumulator 14 bar (203 psi), (load lowering equipment) Other solenoid valves in hydraulic diagram...
Page 478 Figure 5 Hydraulic oil tank Hydraulic oil pump Central valve MA57, brake pressure charging Servo valve Control valve...
Page 479 Valve block, Boom Suspension System Return oil block Oil cooler Solenoid valve block MA36, 4th function MA48, Pressure draining 3rd and 4th functions MA51, separate attachment lock MA85, LS-signal 4th function Accumulator for load lowering and pressure draining Other solenoid valves in hydraulic diagram MA41 Floating position MA55...
Page 480 Figure 6...
Page 481 Hydraulic oil tank Hydraulic oil pump Central valve MA57, brake pressure charging Servo valve Control valve Valve block, Boom Suspension System Return oil block Oil cooler Solenoid valve block MA36, 4th function MA48, Pressure draining 3rd and 4th functions MA51, separate attachment lock MA85, LS-signal 4th function Accumulator for load lowering and pressure draining Other solenoid valves in hydraulic diagram...
Page 482 Figure 7 Hydraulic oil tank Hydraulic oil pump Central valve...
Page 483 MA57, brake pressure charging Servo valve Control valve Valve block, Boom Suspension System Return oil block  Oil cooler, 2 pcs[ 3] Solenoid valve block MA36, 4th function MA48, Pressure draining 3rd and 4th functions MA51, separate attachment lock MA85, LS-signal 4th function Accumulator for load lowering and pressure draining Other solenoid valves in hydraulic diagram MA41...
Page 485 Figure 8 Hydraulic tank with return oil filter Hydraulic pumps Central valve Servo valve Control valve Control valve 5th/6th functions Hydraulic oil cooler MA41 Floating position MA48 Pressure draining MA150 Constant flow via 3rd function...
Page 486 [ 1]Optional equipment [ 2]Optional equipment [ 3]Optional equipment...
Page 487 Service Information Document Title: Function Group: Information Type: Date: Control valve, description Service Information 2014/5/21 Profile: Control valve, description The control valve is a spool/poppet valve with closed centre. The valve consists of three sections where each section consists of three blocks, see Fig. Figure 1 Control valve Anti-cavitation valve, lowering function...
Page 488 Figure 2 Draining of oil behind the stem pistons Draining of LS-pressure (bleed off) Restriction Plug Blocked duct with hex socket plug Control valve, component parts Figure 4 principle diagram, tilting section, see Fig.
Page 489 Figure 3 Control valve, lifting section Stem piston Valve cone Piston Load-holding valve with valve seat Spool Spring Support washer Shock valve Shims Spool. Is actuated by servo pressure. Load-holding valve.Opens if the pump pressure is higher than the pressure acting on the back of the load-holding valve.
Page 490 Figure 4 Tilting section, neutral (Principle diagram) = Oil under pressure Green = Return oil, without pressure Violet = Oil closed in Orange = Stand-by pressure Tilting section, tilting in Servo pressure acts on the left side of spool 1 and on stem piston 7. The oil behind stem piston 7 is drained through connection 12.
Page 491 The LS-pressure is drained by means of a restriction 11 (bleed off) to tank. The oil from the piston rod end of the tilting cylinder is conducted to poppet 6. The poppet is opened by the oil pressure from the cylinder when the stem piston is kept open by servo pressure. The oil is then conducted to back-up valve 9 and further on to the tank.
Page 492 Tilting section, shock function Shock pressure is reached at the piston end of the tilting cylinder, if, for instance, a large stone falls into the bucket. The oil is conducted past poppet 6 on to load-holding valve 2 and further via the duct in the load-holding valve to shock valve 3. Sock valve 3 opens and directs part of the oil flow through restriction 4 back to the tank.
Page 493 = Oil under pressure Green = Return oil, without pressure Blue = Return pressure Orange = Stand-by pressure Lifting section, lifting Servo pressure acts on the left side of spool 1 and on stem piston 7. The oil behind stem piston 7 is drained through connection 12. Oil from the hydraulic pump opens load-holding valve 2.
Page 494 Lifting section, lifting = Oil under pressure Green = Return oil, without pressure Blue = Return pressure Violet = Oil closed in Orange = Servo pressure Lifting section, lowering / tilting in The servo pressure for lowering acts on the right side of spool 1 and on stem piston 7. In order to make the hydraulic pump build up enough pressure to make it possible to operate the tilting-in function while, at the same time, lowering;...
Page 495 Figure 8 Lifting section, lowering / tilting in = Oil under pressure Green = Return oil, without pressure Blue = Return pressure Violet = Oil closed in Orange = Servo pressure Lifting section, floating position MA41 activated, see hydraulic diagram. Servo pressure acts on both sides of spool 1 and on both stem pistons 7.
Page 496 This means that poppets 6 are not actuated by any spring force, but are instead controlled by oil pressure and oil flow. The piston end and the piston rod end of the lifting cylinders then become connected. The LS-pressure is drained by means of a restriction 11 (bleed off) to tank. Figure 9 Lifting section, floating position Green...
Page 497 Stem piston 7 drains to tank via solenoid valve MA55A. The normal draining 12 is closed with a plug 13 which is fitted in the duct. Solenoid valve MA55B is not energised. Single-acting lifting function engaged: When SW97 (on the instrument panel) is actuated MA55A and MA55B obtain supply. Servo pressure to MA55A ensures that stem piston 7 and poppet 6 are closed.
Page 498 Figure 10 Lifting section, single-acting lifting, stand-by (hydraulic pump unloaded) = Oil under pressure Green = Return oil, without pressure Violett = Oil closed in...
Page 499 Orange = Servo pressure and stand-by pressure 3rd section, stand-by (hydraulic pump unloaded) Neutral position: Pistons 12 drained to tank. Stand-by pressure on spool 1. NOTE!  During brake charging, pressure from the BLS[ 1] connection on the central valve will apply a maximum pressure of 16.5 MPa (165 bar) (2393 psi) on the pistons.
Page 500 Green = Return oil, without pressure Violet = Oil closed in Orange = Stand-by pressure Control valve (principle diagram and symbol diagram) Spool Load-holding valve Shock valve Restriction (in steel gasket) Non-return valves (LS-pressure)  Poppet [ 2]  Stem piston[ 3] Anti-cavitation valve Back-up valve Lifting cylinder...
Page 501 Figure 12 Control valve (principle diagram and symbol diagram)
Page 503 Figure 13 Control valve (symbol diagram) [ 1]Brake Load Sensing [ 2]Poppet valve [ 3]Poppet valve...
Page 504 Service Information Document Title: Function Group: Information Type: Date: Shock valve 3:e function, Service Information 2014/5/21 checking and adjusting Profile: Shock valve 3:e function, checking and adjusting Op nbr 1. Connect a pressure gauge 0 - 25 MPa (0 - 3626 psi) to the control valve. 2.
Page 505: Service Information
Service Information Document Title: Function Group: Information Type: Date: Shock valve, lifting Service Information 2014/5/21 function, checking and adjusting Profile: Shock valve, lifting function, checking and adjusting Op nbr 91211 11 666 022 Pressure gauge 0 - 60 MPa (0 - 8700 psi) 11 666 037 Hose 11 666 030 Hand pump 999 3723 Union...
Page 506 Figure 1 Assembling tools 11 666 030 Hand pump 3723 Union 3726 Nipple 3522 Quick-action coupling 11 666 022 Pressure gauge 0 - 60 MPa (0 - 8700 psi) 11 666 037 Hose Remove the cover plate on the front frame and connect pressure hose 11 666 037 to the pressure outlet by the control valve, see Fig.
Page 507 Figure 3 Adjusting shock pressure Valve cone Spring Shims Plug for shock valve Restriction in the gasket...
Page 508 Service Information Document Title: Function Group: Information Type: Date: Shock valve, tilting Service Information 2014/5/21 function, checking and adjusting Profile: Shock valve, tilting function, checking and adjusting Op nbr 91209 11 666 003 Pressure gauge, 0 - 40 MPa (0 - 5800 psi) 11 666 037 Hose The following applies when checking: Temperature:...
Page 509 Figure 2 Checking shock pressure, tilting rearward (piston end) Figure 3 Adjusting shock pressure Valve cone Spring Shims Plug for shock valve Restriction in the gasket Tilting forward, shock valve on tilting cylinder (piston rod end) Figure 1 3. Connect the pressure gauge (0 - 40 MPa) to the pressure outlet for tilting forward, see Fig. 4.
Page 510 Figure 4 Checking shock pressure, tilting rearward (piston rod end)
Page 511 Service Information Document Title: Function Group: Information Type: Date: Stand-by pressure, Service Information 2014/5/21 checking and adjusting Profile: Stand-by pressure, checking and adjusting Op nbr 91303 11 666 020 Pressure gauge, 0 - 25 MPa (0 - 3626 psi) 11 666 037 Hose The following applies when checking: Temperature: Normal working temperature...
Page 512 to approx. 16.5 MPa (2393 psi). Then wait until the pressure in the brake system has been built up, after which the stand-by pressure may be checked (see Section 5 for more information). Adjustment is carried out with the adjusting screw on the pressure compensator of the respective pumps as follows: Adjusting 3.
Page 513 Service Information Document Title: Function Group: Information Type: Date: Working pressure, checking Service Information 2014/5/21 and adjusting Profile: Working pressure, checking and adjusting Op nbr 91304 11 666 003 Pressure gauge, 0 - 40 MPa (0 - 5800 psi) 11 666 037 Hose The following applies when checking: Temperature: Normal working temperature...
Page 514 2. SloLy move the lowering control lever to full deflection. Read off the pressure when the lifting arms have reached their bottom position. NOTE! The floating position (SW60) must not be selected during this the check. Adjustment is carried out with the adjusting screw on the pressure compensator of the respective pumps as follows: Adjusting 3.
Page 515: Servo System
Service Information Document Title: Function Group: Information Type: Date: Servo system Service Information 2014/5/21 Profile: Servo system Figure 1 Servo valve Thrust pin Valve spool Spring Connection to control valve The servo valve consists of four or six valve spools, one for each hydraulic function. The servo valve works in principle as a pressure-reducing valve.
Page 516 solenoid. Figure 2 Servo valve Figure 3 Pressure diagram, output pressure from servo valve Servo pressure Thrust pin stroke Starting pressure 0.3 MPa (44 psi) (applies to all spools) Forced opening Max. servo pressure Controllable servo pressure...
Page 517 Figure 4 Thrust pin and guide Thrust pin stroke, 6.5 - 6.6 mm (0.256 - 0.260 in) Washer Thrust pin Guide O-ring O-ring Spacer washers for adjusting starting position (1.2 mm (0.047 in) stroke) of the thrust pin before the valve spool opens and the so called starting pressure is obtained Lock ring Spacer washers for adjusting stroke...
Page 518 Figure 5 FjSpring pack with valve spool Spacer washers for adjusting starting pressure Bolt Spacer washers, forced opening Spring Return spring Valve spool...
Page 519 Service Information Document Title: Function Group: Information Type: Date: Servo pressure, checking Service Information 2014/5/21 and adjusting Profile: Servo pressure, checking and adjusting Op nbr 91455 11 666 019 Pressure gauge, 0 - 6 MPa (0 - 870 psi) 11 666 037 Hose The following applies when checking: Temperature: Normal working temperature...
Page 520 Figure 1 Central valve, checking and adjusting servo pressure Hose 11 666 037 with pressure gauge 11 666 019 2. Start the engine. 3. Tilt inward (rearward) until stop and read off max. servo pressure on the pressure gauge. Adjusting 4.
Page 521 Figure 2 Adjusting, servo pressure...
Page 522 Service Information Document Title: Function Group: Information Type: Date: Servo pressure, checking at Service Information 2014/5/21 spool in control valve Profile: Servo pressure, checking at spool in control valve Op nbr 91463 999 3704 Nipple, 2 pcs 11 666 019 Pressure gauge, range 0 - 6 MPa (0 - 870 psi), 2 pcs 11 666 037 Hose, 2 st E 1370 Support The following applies when checking:...
Page 523 Checking 1. Remove the cover plate in the front frame. Fit two nipples 3704, one on either side of the valve spool, for the function which is to be checked.Connect hoses and pressure gauges, see Fig. Figure 2 Checking servo pressure at valve spool 3704 (connected one on either side of the valve spool) 11 666 037 and 11 666 019 (2 of each) 3.
Page 524 Service Information Document Title: Function Group: Information Type: Date: Servo valve, operating Service Information 2014/5/21 controls, adjusting Profile: Servo valve, operating controls, adjusting Op nbr 91454 Control levers, adjusting 1. Remove cover and switches. 2. Adjust the distance between the lever adjusting screw and thrust pin, see Fig. Figure 1 Sensing position Adjusing screw...
Page 525 Figure 2 2–3 mm (0.079 – 0118 in) Striking plate Holding solenoid Sacer washer Alt 2. Connect a pressure gauge (0 - 6 MPa) according to Fig. Figure 3 Checking servo pressure at valve spool 3704 (connected one on either side of the valve spool) 11 666 037 and 11 666 019 (2 of each) Adjust so that the sensing position is reached at a pressure of 1.6 MPa (16 bar) (232 psi).
Page 526 CAUTION The floating position should never become engaged until the sensing position has been passed. Figure 4 Microswitch Lock nut Holding solenoid, lifting (MA20) Holding solenoid, tilting rearward (MA19) Holding solenoid, floating position (MA21) Holding solenoid, holding function 3: (MA76) Figure 5 SW60 Switch floating position (right instrument panel) 7.
Page 527 Service Information Document Title: Function Group: Information Type: Date: 4th Hydraulic function Service Information 2014/5/21 Profile: 4th Hydraulic function L70C can, in addition to the ordinary control valve, be equipped with an electrically controlled solenoid valve (MA36A) for operating the 4th hydraulic function, the quick-action couplings of which are fitted furthest out on the lifting arms. The oil flow is controlled with a spring-return switch (SW19) on the control lever carrier casing for the ordinary hydraulic functions and is either connected or disconnected.
Page 528 Figure 1 Solenoid valve MA36A/B and pressure relief valve Solenoid valve MA48/85 (only up to incl. serial number -12340) s/n — 12340...
Page 529 Figure 2 s/n 12341 —...
Page 531 Figure 3...
Page 533 Service Information Document Title: Function Group: Information Type: Date: Hydraulic Service Information 2014/5/21 functions Profile: 5th and 6th Hydraulic functions Loader L70C can, in addition to the ordinary control valve, be equipped with an electrically controlled 2-section valve for operation of the 5th and 6th hydraulic functions. Figure 1 Control valve, 5th/6th hydraulic functions...
Page 534 Figure 2 Symbol diagram 5th/6th control valve Pressure-limiting valve (max. 210 bar = 3046 psi) Anti-cavitation valves Spool affected by servo pressure Compensator Copying spool, copies the pump pressure to LS- The valve is supplied from the ordinary hydraulic pumps and can thus be installed in the machine without "Attachment Hydraulics HD"...
Page 535 Figure 3 Switch for 5th and 6th hydraulic functions, SW125 Control lever 6th hydraulic function, CU16 Control lever 5th hydraulic function, CU18 On the console for the control levers there is also a switch. The switch must be actuated in order to be able to use the 5th and 6th functions.
Page 536 Figure 4 Switch for 5th and 6th hydraulic functions Control lever for 6th hydraulic function Control lever for 5th hydraulic function 5th / 6th hydraulic functions, description of function The following text describes the 5th hydraulic function. (The 6th hydraulic function works in the same way). RE26 always obtains battery voltage at connection 30, and when the ignition key is turned to running position, position 1, voltage is obtained at connection 86 and RE26 is activated.
Page 537 Figure 5 Position of connector HK for 5th/6th functions In the linear lever CU18 there is a microswitch for centre position indication and a non-contacting inductive sensor for the lever position. The output terminals HN1 and HN2 on CU17 are current-controlled, so called pulse width modulated (PWM), which means that they supply the correct current regardless the feed voltage and changes in resistance in the circuits for MA132 and MA133.
Page 538 Figure 7 Hydraulschema 5:e/6:e hydraulfunktion Wiring diagram 5th/6th hydraulic functions...
Page 539 Figure 8...
Page 540 CU15 Control unit, 6th function CU16 Linear lever, 6th function CU17 Control unit, 5th function CU18 Linear lever, 5th function MA130 Solenoid valve, 6th function MA131 Solenoid valve, 6th function MA132 Solenoid valve, 5th function MA133 Solenoid valve, 5th function RE26 Relay, unloading ignition switch RE35...
Page 541 Figure 10 Position of conector HK Figure 9 Adjust the flow (the speed) to 0.4 A with screw 2 (lever forward). Figure 9 Adjust the symmetry between the plus (+) and minus ( - ) sides using screw 3 , so that lever rearward also provides 0.4 A.
Page 542 adjusting final speed, common to both directions fine adjustment of final speed, lever forward. Adjusting starting speed 5th function (6th function is adjusted in a similar way). Operate the lowering function for the standard hydraulics against the end position and keepthe lowering lever in this position so that max.
Page 543 resistance in the solenoid valves should be 24.6 ohm at +20 °C (68 °F) and 27 ohm at +50 °C (122 °). If this cannot be achieved the solenoid valves should be changed. If the measured values for the lever and the solenoid valves are correct and in spite of this the system does not work, the control unit is faulty or the trimming potentiometers are to a large extent incorrectly adjusted.
Page 544 Service Information Document Title: Function Group: Information Type: Date: Attachment hydraulics GP, Service Information 2014/5/21 description Profile: Attachment hydraulics GP, description "Attachment Hydraulics GP" (General Purpose) makes it possible to operate hydraulic equipment with medium power requirements continuously during hard operation (for example a sweeper). "Attachment Hydraulics GP"...
Page 545 Figure 2 Flow control MA150, activates flow control Adjustable flow regulator, (servo pressure 0 - 3.5 MPa = 0 - 508 psi) There is also a holding function in the equipment. It consists of switch SW88, positioned on the right panel and a holding solenoid MA76 positioned on the control lever of the servo valve for the 3rd function.
Page 546 Figure 3 Pressure gauge Wheel for adjusting flow Emergency stop, SW143 There is an emergency stop SW137 and a holding relay RE42 in order to increase safety. RE42 interrupts the supply, if the engine is stopped. This means that SW141 must be turned off and then on again in order to restart the hydraulic equipment, e.g.
Page 547  Max. power requirement (HD) 65 kW For more information about attachment hydraulics HD, see Service Manual Hydraulic Equipment ref. no. 21 1 669 6649. Figure 4 Attachment Hydraulics GP and flow control for 3rd function (common electrical system) circuits 27:4 - 27:8...
Page 549 [ 1]Also for constant flow (return) 3rd hydraulic function [ 2]Also for constant flow (pressure) 3rd hydraulic function...
Page 550 Service Information Document Title: Function Group: Information Type: Date: Boom Suspension System Service Information 2014/5/21 Profile: Boom Suspension System NOTE! Only machines with Contronic (ECU) can be equipped with Boom Suspension System. In order to increase the operator comfort and to reduce mechanical stresses on the frame, drive line, lifting frame etc., a suspension system is available as optional equipment.
Page 551 bucket filling stage when 1st gear is used and then automatically engaged when upshifting to a higher gear takes place. Speed dependent disengagement of Boom Suspension System If the lower end of switch SW142 is pressed in, the system will be engaged when the travelling speed exceeds approx. 5 km/ h = 3.1 mph.
Page 552 Connection to piston end of lifting cylinders Connection to piston rod end of lifting cylinders Connection to hydraulic system return pipe Connection to control valve inlet (pressure side) Connection to hydraulic system return pipe Connection for pressure gauge Position of components Figure 3...
Page 553 Figure 4 Position of components, front frame Direction of travel Accumulator Control valve, working hydraulics Valve block, Boom Suspension System Solenoid valve, MA129 Solenoid valve, MA59 Solenoid valve, MA55B Sensor SE88 Sensor, SE87 for single-acting lifting function Solenoid valve, MA55A (single-acting lifting function) Solenoid valve, MA41 (floating position) Connections Connection to accumulator...
Page 554 control lamp LC38 and solenoid valves MA59 and MA55B is interrupted. Wiring diagram, Boom Suspension System...
Page 556 Figure 5 LC 38 Control lamp, Boom Suspension System MA 55B, MA 59 Control lamp, Boom Suspension System MA55B, MA59 Solenoid valves, fitted in Boom Suspension System valve block RE 22 Relay, Boom Suspension System SW 106 Switch for Boom Suspension System, the switch has spring return action SW 142 Switch for selection between Kick-down dependent...
Page 557 Figure 6 Control valve, lifting section Plug Deactivated Boom Suspension System Via the built-in non-return valves the solenoid valves MA55B and MA59 close the connection between the piston rod end of the lifting cylinders and the tank and between the piston end of the cylinders and the accumulator.
Page 558 Figure 7 Hydraulic diagram...
Page 559 Valve block, boom suspension system Pressure-reducing valve R1 The valve works as a pilot valve for poppet D and works together with the poppet as a pressure-reducing valve and limits the pressure in the accumulator to 20 MPa (2900 psi). If the closing pressure is too high, more than 21 MPa (3046 psi), the lifting arms lower slightly because safety valve TB opens.
Page 560 Accumulator Non-return valve Poppet MA59B Solenoid valve Boom Suspension System MA59A Solenoid valve Boom Suspension System Pressure-reducing valve for the accumulator Pressure-reducing valve for the accumulator Safety valve for the accumulator Lifting cylinder...
Page 561 Service Information Document Title: Function Group: Information Type: Date: Flow control 3rd function Service Information 2014/5/21 Profile: Flow control 3rd function Flow control of the 3rd function makes it possible to operate hydraulic equipment with a smaller power requirement. The difference between this equipment and "Attachment Hydraulics GP"...
Page 562 Service Information Document Title: Function Group: Information Type: Date: Accumulator boom Service Information 2014/5/21 suspension system, releasing pressure Profile: Accumulator for boom suspension system, releasing pressure Op nbr CAUTION Before any work is carried out on the hydraulic system of the Boom Suspension System, the hydraulic oil pressure in the accumulator must be released as follows.
Page 563 Service Information Document Title: Function Group: Information Type: Date: Accumulator, boom Service Information 2014/5/21 suspension system, reconditioning Profile: Accumulator, boom suspension system, reconditioning Op nbr 91603 999 3734 Fitting sleeve Dismantling 1. Release the hydraulic oil pressure in the accumulator according to "ACCUMULATOR FOR BOOM SUSPENSION SYSTEM, RELEASING PRESSURE"...
Page 564 Figure 1 Accumulator Stamped-in ser. no. Cylinder tube End plate, oil side End plate, gas side Piston Oil seal Oil seal Lock ring Washer Washer Bolt Bolt O-ring Gas valve Protective clamp 8. Carefully press the piston out of the cylinder tube with the aid of a wooden rod. 9.
Page 565 17. Precharge the accumulator according to the Specifications. 18. Check for any gas leakage with the aid of leak-tracing fluid or alternatively a soap and water solution or oil. 19. Fit the protective cap for the gas valve and the protective clamp for the accumulator. 20.
Page 566 Service Information Document Title: Function Group: Information Type: Date: Accumulator, precharging Service Information 2014/5/21 pressure, checking adjusting Profile: Accumulator, precharging pressure, checking and adjusting Op nbr 91602 11 666 008 Gas filling set 11 666 018 Pressure gauge 0 - 25 MPa (0 - 3626 psi) An impaired suspension function may be caused by too low precharging pressure in the accumulator.
Page 567 Figure 1 Checking precharging pressure Gas cylinder Breather valve Pressure gauge Accumulator Gas pressure regulator T-handle 9. Close the accumulator gas valve and remove the gas filling set. 10. Check for any gas leakage both on threads and gas valve with the aid of leak-tracing fluid or a soap and water solution.
Page 568 Service Information Document Title: Function Group: Information Type: Date: Boom suspension system, Service Information 2014/5/21 checking Profile: Boom suspension system, checking Op nbr 91601 Checking flow path from hydraulic oil pump to lifting cylinder and accumulator. (Boom Suspension System not activated). 1.
Page 569 Checking electrical functions. 12. Activate the Boom Suspension System with SW106 and tilt inward (rearward) until stop and keep the control lever in that position. The lifting arms should now rise sloLy and control lamp LC38 light with a fixed light. 13.
Page 570 Service Information Document Title: Function Group: Information Type: Date: Pressure-reducing valves Service Information 2014/5/21 closing pressure, checking Profile: Pressure-reducing valves R1 and R2, closing pressure, checking Op nbr 91604 11 666 022 Pressure gauge 0 - 60 MPa (0 - 8700 psi) 11 666 037 Hose 963804 Reducing nipple 930032 Quick-action coupling...
Page 571 6. The closing pressure of the pressure-reducing valve R1 is checked by raising the lifting arms against their top position. When the arms have reached the top position, the pressure should quickly rise to 12 MPa (1740 psi). The closing pressure of the pressure-reducing valve R2 is checked by sloLy tilting the bucket rearward against the end position.
Page 572 Service Information Document Title: Function Group: Information Type: Date: Safety valve TB, opening Service Information 2014/5/21 pressure, checking Profile: Safety valve TB, opening pressure, checking Op nbr 91605 11 666 003 Pressure gauge 0 - 40 MPa (0 - 5800 psi) 11 666 030 Hand pump 11 666 037 Hose 999 3723 Coupling...
Page 573 11 666 037 Hose 3. Drill a 12 mm hole in a blind nut 4821970 and thread to 1/4" BSP and loosen the accumulator connection in the valve block. In stead fit the blind nut together with a quick-action coupling 930032. 4.
Page 574 Service Information Document Title: Function Group: Information Type: Date: Lifting cylinder Service Information 2014/5/21 Profile: Lifting cylinder Figure 1 Lifting cylinder Oil seal Piston seal O-ring with support rings O-ring with support ring Seal Seal Scraper seal Slide ring...
Page 575 Service Information Document Title: Function Group: Information Type: Date: Tilting cylinder Service Information 2014/5/21 Profile: Tilting cylinder Figure 1 Tilting cylinder Oil seal Piston seal O-ring with support rings O-ring with support ring Seal Seal Scraper seal Slide ring...
Page 576 Thank you for your purchase. Have a nice day. file:///C|/Users/app/Documents/yeqiwen-END.txt[2014/5/21 9:18:46]...