Jacobsen SLF 1880 Technical/Repair Manual
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Jacobsen SLF 1880 Technical/Repair Manual

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Technical Repair Manual
SLF 1880

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  • Page 1 Technical Repair Manual SLF 1880...
  • Page 2 Page Intentionally Blank...
  • Page 3 ©2011, Jacobsen, A Textron Company. All rights reserved. Litho in the U.S.A. 5/2011 Part Number 4171721 Rev B...
  • Page 4 Page Intentionally Blank...
  • Page 5 Proposition 65 Warning This manual provides detailed information and proce- WARNING dures to safely repair and maintain the following: Jacobsen® SLF1880™ fairway mower and associated accessory attachments. Certain vehicle components contain or emit chemicals known to the state of California to...
  • Page 6 Forward Quick Reference Specifications How to Use This Manual A list of all machine specifications can be found in This manual is designed to provide multiple ways to Chapter 1 “Specifications”. This is a list of all general locate and access repair information. specifications.
  • Page 7 INTRODUCTION CONTROLS ENGINE DRIVE TRAIN BRAKE SYSTEM STEERING WHEELS AND TIRES HYDRAULICS CHASSIS ELECTRICAL SYSTEM PREVENTIVE MAINTENANCE ATTACHMENTS OPTIONS MISCELLANEOUS...
  • Page 8 Page Intentionally Blank...
  • Page 9 INTRODUCTION SECTION 1 INTRODUCTION General Information ............................1 Contents ..............................1 Index Numbers............................1 Replacement Parts........................... 1 Specifications ............................2 Serial Numbers ............................4 General Cleaning ............................. 4 Safety ............................... 4 Torque Values ............................10...
  • Page 10 INTRODUCTION Page Intentionally Blank...
  • Page 11 BER, and the PART DESCRIPTION. uct that may not be included in this manual. Each man- ual is reviewed and updated as required to include 5. Send your order to or visit your nearest Jacobsen changes and product improvements. dealer or distributor.
  • Page 12 INTRODUCTION SPECIFICATIONS Displacement ........68.5 cu. In (1123 cc) Torque ......54 ft-lbs. (73 Nm) @ 2200 rpm Fuel: Product Information Type ............No. 2 Diesel Rating........... Cetane Rating-45 67923..........Super LF-1880 2WD Capacity ......12 U.S. Gal. (45.4 liters) 67924..........Super LF-1880 4WD High-speed - rpm ........3150 no load 67938.........Super LF-1880 Turbo 4WD Low idle - rpm..........1750 no load Lubrication:...
  • Page 13 INTRODUCTION Displacement ........ 68.5 cu. In (1123 cc) Cutting Width........80 in (2032 mm) Torque .....52.7 ft-lbs. (71.5 Nm) @ 2200 rpm Cutting Frequency: Fuel: 8 Blade......0.067 in/mph (1.06 mm/kph) Type....No. 2 Low or Ultra Low Sulfur Diesel 11 Blade ...... 0.049 in/mph (0.77 mm/kph) Rating ..........
  • Page 14 INTRODUCTION SERIAL NUMBERS Accessories and Support Literature Contact your area Jacobsen dealer for a complete list- See Figure 1A-2 for location of tractor assembly series ing of accessories and attachments number. CAUTION Use of other than Jacobsen authorized parts and accessories may cause personal injury or damage to the equipment and could void the warranty.
  • Page 15 INTRODUCTION • Use eye/face protection. Always use proper eye/ WARNING face protection to protect your eyes from flying debris or chemical splatters. • Wear protective footwear. Wear safety shoes Hazards or unsafe practices which could result in severe personal injury or death. (steel-toe) to protect your feet from falling objects.
  • Page 16 INTRODUCTION Keep Work Area Clean • Face Shields: Face shields are often used along with safety glasses to offer a higher level of A clean, organized, well-lit work area is important to protection when sparks fly and flying debris are promote safe working conditions.
  • Page 17 INTRODUCTION Support Machine Securely • Disconnect the air supply before changing air tool attachments. WARNING • Never point air nozzles or air tools at another person. • Support the machine using properly rated • Always maintain air tools properly. jackstands. Never work under a machine supported only by a jack.
  • Page 18 INTRODUCTION Handle Fuel Safely Handle Chemical Products Safely Handle fuel with care - it is highly flammable. WARNING WARNING Exposure to chemical products could result in serious injury. Handle chemical products with • Never remove the fuel cap from the fuel tank, care.
  • Page 19 INTRODUCTION • Disconnect the battery negative (-) cable before ble with the storage container. Never use food or bev- removing or installing electrical components. Always erage containers to store waste fluids. connect the battery negative (-) Cable last. NOTICE • Certain test and adjustment procedures must be performed with the battery connected.
  • Page 20 INTRODUCTION TORQUE VALUES Torque values are given in the “Torque Specifications Chart.” Special torque values are called out in illustra- tions and text throughout this manual. Torque Specifications - Standard SAE Grade #5 Screws Size (In) Torque Values Size (In) Torque Values 8-32 27-33 in-lbs (3-4 Nm)

  • Page 21: Table Of Contents

    CONTROLS SECTION 2 CONTROLS Repair And Service Tools and Materials......................1 Materials Required ........................... 1 Specifications ............................1 Failure Analysis .............................. 3 General ..............................3 Control Adjustments ............................5 General ..............................5 Throttle ..............................5 Neutral And Reverse Sensing Switches ....................6 Traction Pedal Speed Limiter ........................
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  • Page 23: Repair And Service Tools And Materials

    SECTION 2A. REPAIR AND SERVICE TOOLS AND MATERIALS MATERIALS REQUIRED Standard automotive hand tools Tools required: Stoddard solvent or equivalent Cleaning materials: Detergent and water Refer to Section 11 Lubricants: SPECIFICATIONS Throttle Engine low idle speed..........................1750 rpm Engine high idle speed..........................3150 rpm Traction Pedal Transport speed (2 WD)......................0-10.5 mph (16.9 kph) Mow speed (4 WD)........................0-6 mph (9.6 kph)
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  • Page 25: Failure Analysis

    SECTION 2B. FAILURE ANALYSIS GENERAL The following table lists common problems, probable causes, and suggested remedies with section refer- ences to detailed descriptions of remedial procedures. PROBLEM PROBABLE CAUSE REMEDY 1. Engine does not turn over a. Not in neutral a.
  • Page 26 Page Intentionally Blank 2B-4...

  • Page 27: Control Adjustments

    3. Place the engine throttle lever on injection pump proper adjustment cannot be made, contact an autho- against the max speed screw. rized Jacobsen dealer. 4. Adjust the throttle cable nuts until the cable eyelet is positioned on the pin as shown.

  • Page 28: Neutral And Reverse Sensing Switches

    NEUTRAL AND REVERSE SENSING • Magnetic Switch - 0.098 to 0.125 in. (2.5 to 3 mm). SWITCHES • Digital (Orange) Switch - 0.125 to 0.157 in. (3 to 4 mm). Neutral Switch 5. Tighten jam nut against adjusting nut. The traction pedal is designed to return to neutral 6.

  • Page 29: Traction Pedal Speed Limiter

    TRACTION PEDAL SPEED LIMITER MAXIMUM TRANSPORT SPEED Cutting quality is better at speeds well below the trans- Before making speed adjustments at the pump, check port speed of the tractor. An initial mow speed of 6 mph that the engine is running at full rpm under load and the is set at the factory and should be satisfactory for most throttle is adjusted correctly.

  • Page 30: Parking Brake

    Caliper Inner Pad and NOTICE Mounting Support Plate Additional adjustment may be made on the rod end Caliper at the pump if necessary. Actuating Lever Outer Pad and NOTICE Support Plate Pivot Make sure that the traction pedal bottoms out on the floor board so that the control lever on the Figure 2C-7.
  • Page 31 Upper Adjusting Lower Adjusting NOTICE Do not overtighten or turn the cable. 5. Connect the brake return spring. Repeat for the second cable. Figure 2C-9. Parking Brake Cables 2C-9...

  • Page 32: Brake Interlock Switch

    BRAKE INTERLOCK SWITCH • Digital (Orange) Switch - 0.125 to 0.157 in. (3 to 4 mm). NOTICE Brake Arm Gap Use a multimeter to determine when the switch con- tacts open and close. With the ignition switch in the ON position, one of the switch wires will have current (12V) available at all times.
  • Page 33 7. With the lift arm at 30°, adjust the switch (Figure 2C-13) until the contacts open. Secure the switch to maintain the setting. Lift Arm 8. Manually lower the lift arm. The switch contact should close when the lift arm drops below 30° (Figure 2C-13).
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  • Page 35: Gauges And Instruments

    SECTION 2D. GAUGES AND INSTRUMENTS REPAIR 1. Disconnect the battery ground (black) cable. 2. Label the wires for proper identification and dis- NOTICE connect wiring. 3. Remove the attached hardware and replace the Refer to Section 10 for test and repair procedures of component.
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  • Page 37 ENGINE SECTION 3 ENGINE Repair, Service Tools, and Materials ......................1 Materials Required ........................... 1 Failure Analysis .............................. 3 General ..............................3 General Instructions............................5 Contents ..............................5 Cleaning & Lubrication ..........................5 Engine................................7 General ..............................7 Engine Belt............................... 7 Engine Oil..............................
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  • Page 39: Repair, Service Tools, And Materials

    SECTION 3A. REPAIR, SERVICE TOOLS, AND MATERIALS MATERIALS REQUIRED Standard automotive hand tools Tools required: Stoddard solvent or equivalent Cleaning Detergent and water materials: Anti-rust, Never-Seize Refer to Section 11 Lubricants: Compressed air source Other service Engine hoist items: SPECIFICATIONS Engines Kubota D1105E......Torque 54 ft-lbs.
  • Page 40 Page Intentionally Blank 3A-2...

  • Page 41: Failure Analysis

    SECTION 3B. FAILURE ANALYSIS GENERAL The following table lists common problems, probable causes, and suggested remedies with section refer- ences to detailed descriptions of remedial procedures. PROBLEM PROBABLE CAUSE REMEDY 1. Engine will not start a. Parking brake disengaged or a.
  • Page 42 Page Intentionally Blank 3B-4...

  • Page 43: General Instructions

    SECTION 3C. GENERAL INSTRUCTIONS CONTENTS CLEANING & LUBRICATION A Kubota three cylinder diesel engine is used in the Thoroughly cleaning the engine on a regular basis will Super LF-1880 Fairway Mower. The Kubota D1105-E & provide better conditions for component removal, D1105-E3B liquid cooled engine is used for all mower repair, and inspection.
  • Page 44 Page Intentionally Blank 3C-6...

  • Page 45: General

    1. Adjustments and maintenance should always be performed by a qualified technician. If proper adjustment cannot be made, contact an autho- rized Jacobsen dealer. 2. Replace, do not adjust, worn or damaged compo- nents. ENGINE BELT Inspect and adjust the new engine belt after the first 50 hours of operation.

  • Page 46: Engine Oil

    ENGINE OIL AIR CLEANER Check the engine oil at the start of each day, before The air cleaner assembly includes an air filter restric- starting the engine. If the oil level is low, do not add oil tion gauge. The gauge indicates the condition of the air until the oil level reaches the add mark, remove the oil filter based on the amount of suction required to draw filler cap and add 1qt (.946 L) of oil as required...
  • Page 47 Inlet Hose Intake Hose Intake Hose Turbo Units Cleaner Air Filter Restriction Guage Plenum Figure 3D-4. Air Cleaner Assembly Exploded View 1. Release the spring clips and remove the air 4. Inspect the new filter element. Do not use a dam- cleaner end cover.

  • Page 48: Radiator Service

    RADIATOR SERVICE CAUTION CAUTION Always use a mixture of ethylene glycol base anti- freeze and fresh water in the engine cooling system. Never remove the radiator cap when the coolant is Normally a 50/50 coolant mixture will provide freeze hot. The engine must be shut off and cooled before protection to -37°F (-38°C) and boil over protection the radiator cap is removed.
  • Page 49 Figure 3D-6. Radiator, Hydraulic Oil Cooler, and Dust Screen Removal 9. Carefully remove the radiator from the mount. 1. Shut off the engine and remove the ignition key. Installation 1. Place the radiator in position on the radiator CAUTION mount and secure with three bolts on each side. 2.

  • Page 50: Exhaust System

    EXHAUST SYSTEM Inspect the exhaust system for cracks, holes, and dis- tortion (Figure 3D-7). Tighten or replace the exhaust clamps. CAUTION Do not attempt to service the exhaust system when the engine is hot. Serious personal injury can occur. NOTICE If a change in the color or sound of the exhaust occurs, stop the engine immediately, identify the problem and repair as necessary.

  • Page 51: Fuel System

    FUEL SYSTEM CAUTION The fuel filter is mounted on the rear of the engine above the battery. Moisture and other foreign matter Never remove the fuel cap from the fuel tank or add can accumulate in the fuel filter. The filter should be fuel when the engine is running.
  • Page 52 Fuel Filter Service 5. Remove the filter element and drain the excess fuel into an appropriate container. 1. Shut off the engine and remove the ignition key. Allow the engine to cool completely before servic- CAUTION ing. 2. Close the fuel filter valve (Figure 3D-9). Dispose of fuel properly.

  • Page 53: Engine Removal

    Purging the Fuel System 7. Inspect the fuel filter, hoses, clamps, and pipes for leaks. Repair as necessary. NOTICE 8. Place the ignition switch in the OFF position. ENGINE REMOVAL Refer to the engine manufacturer’s manual for addi- tional information on the fuel system. The engine is mounted behind the driver’s seat and drives the traction pump using a drive shaft.

  • Page 54: Engine Installation

    ENGINE INSTALLATION 9. Using the procedures in Section 2, connect the throttle cable on the injection pump and cable housing clamp. 1. If necessary, remove components from the engine and install on the components on the new engine. 10.Connect the fuel outlet hose to the fuel filter and open the fuel valve.
  • Page 55 Air Clean Assembly Throttle Cable and Housing Clamp Battery Drive Shaft Fuel Filter Fuel Hose Clamp and Engine Mount Alternator Radiator Hoses Figure 3D-13. Engine Components 3D-17...
  • Page 56 Page Intentionally Blank 3D-18...
  • Page 57 DRIVE TRAIN SECTION 4 DRIVE TRAIN Repair and Service Tools and Materials ......................1 Materials Required ........................... 1 Specifications ............................1 Failure Analysis .............................. 3 General ..............................3 Traction Pump-Drive Shaft..........................5 General ..............................5 Service ..............................5...
  • Page 58 Page Intentionally Blank...

  • Page 59: Repair And Service Tools And Materials

    SECTION 4A. REPAIR AND SERVICE TOOLS AND MATERIALS MATERIALS REQUIRED Standard automotive hand tools Tools required: Stoddard solvent or equivalent Cleaning materials: Refer to Section 11 Lubricants: SPECIFICATIONS Driveshaft Total Length..........................11.144 in (283 mm) Balance............................<2 oz-in @3200 rpm Flange Bolt Torque......................35-40 ft-lbs. (47-54 Nm) 4A-1...
  • Page 60 Page Intentionally Blank 4A-2...

  • Page 61: Failure Analysis

    SECTION 4B. FAILURE ANALYSIS GENERAL The following table lists common problems, probable causes, and suggested remedies with section refer- ences to detailed descriptions of remedial procedures. PROBLEM PROBABLE CAUSE REMEDY 1. Drive shaft loose a. Universal joints worn a. Change (Section 4C) 2.
  • Page 62 Page Intentionally Blank 4B-4...

  • Page 63: Traction Pump-Drive Shaft

    SECTION 4C. TRACTION PUMP-DRIVE SHAFT GENERAL The traction pump is driven by a universal joint type drive shaft connected between the drive pump and engine. SERVICE Removal 1. Remove the four socket head screws securing the rear yoke to the engine drive plate (Figure 4C-1). Rear Yoke U-Joint Front Yoke...
  • Page 64 Assembly 4. Slowly and carefully tighten the vise. The bearing caps will be pressed into the ears. The bearing NOTICE caps should be pressed evenly until the bearing cap rubber seal completely covers the cross shaft. During assembly make sure all parts, especially the 5.
  • Page 65 BRAKE SYSTEM SECTION 5 BRAKE SYSTEM Repair and Service Tools and Materials ......................1 Materials Required ........................... 1 Specifications ............................1 Failure Analysis .............................. 3 General ..............................3 Parking Brake ..............................5 General ..............................5 Cables ..............................5...
  • Page 66 Page Intentionally Blank...

  • Page 67: Repair And Service Tools And Materials

    SECTION 5A. REPAIR AND SERVICE TOOLS AND MATERIALS MATERIALS REQUIRED Standard automotive hand tools Tools required: Stoddard solvent or equivalent Cleaning materials: Refer to Section 11 Lubricants: Brake pads Other service items: SPECIFICATIONS Brakes Brake Pedal Free Travel........................1.5 in (38 mm) Brake Disc Diameter........................10.7 in (271.7 mm) Brake Disc Thickness........................0.187 in (4.7mm) Brake Pad Thickness (Inside Pad)....................0.530 in (13.5mm)
  • Page 68 Page Intentionally Blank 5A-2...

  • Page 69: Failure Analysis

    SECTION 5B. FAILURE ANALYSIS GENERAL The following table lists common problems, probable causes, and suggested remedies with section refer- ences to detailed descriptions of remedial procedures. PROBLEM PROBABLE CAUSE REMEDY 1. Parking brake does not hold a. Brake is misadjusted a.
  • Page 70 Page Intentionally Blank 5B-4...

  • Page 71: General

    SECTION 5C. PARKING BRAKE GENERAL CABLES The brake system used on the LF-1880 is a mechani- The brake cables (Figure 5C-1) are connected to the cal disc brake system actuated by a left and right brake brake pedal and the actuating lever. When pushed, the cable.
  • Page 72 Disassembly 3. Inspect the spring retainer and actuating lever and return springs for wear and distortion. Replace as 1. Using a suitable jack, lift the front wheels off the necessary. ground. Support the tractor with jack stands. 4. Inspect the cables and cable mounting for wear 2.
  • Page 73 Adjustment 3. Use the cable nuts to adjust free travel and actuat- ing lever position. 1. Check the brake-actuating lever. The lever should 4. Repeat the procedure for the other side. just touch the inner support plate. 2. Check the brake pedal free travel (Figure 5C-2). The pedal free travel should be approximately 1.5 in (38 mm).
  • Page 74 Page Intentionally Blank 5C-8...
  • Page 75 STEERING SECTION 6 STEERING Repair, Service Tools, and Materials ......................1 Materials Required ........................... 1 Specifications ............................2 Failure Analysis .............................. 3 General ..............................3 Steering valve ..............................5 General ..............................5 Removal ..............................5 Steering Valve Disassembly ........................6 Steering Valve Inspection .........................
  • Page 76 Page Intentionally Blank...

  • Page 77: Materials Required

    SECTION 6A. REPAIR, SERVICE TOOLS, AND MATERIALS MATERIALS REQUIRED Standard automotive hand tools Tools required: Stoddard solvent or equivalent Cleaning materials: Refer to Section 11 Lubricants: 6 pieces 0.007 in (0.18 mm) shim stock 0.5 in (13 mm) Other service wide and 1.5 in (38 mm) long items: Portable hydraulic filtering unit...
  • Page 78 SPECIFICATIONS Steering Valve Circuit Relief Valve Pressure......................1160 PSI (80 bar) Steering Circuit Flow....................5.5 gpm @ 3000 rpm (20.8 lpm) Steering Valve Displacement Per Revolution................6.6 Cu in (108 cc) Steering Cylinder Steering Cylinder Bore........................1.5 in (38.1 mm) Steering Cylinder Rod........................0.750 in (19 mm) Steering Cylinder Stroke........................9 in (22.8 cm) Steering Axle Rear Wheel Toe-in....................0.0625 to 0.125 in (1.6 to 3.2 mm)

  • Page 79: General

    SECTION 6B. FAILURE ANALYSIS GENERAL The following table lists common problems, probable causes, and suggested remedies with section refer- ences to detailed descriptions of remedial procedures. PROBLEM PROBABLE CAUSE REMEDY 1. Noisy when steering wheel is a. Low hissing sound a.
  • Page 80 PROBLEM PROBABLE CAUSE REMEDY 6. Lost motion at steering a. Steering wheel loose a. Tighten wheel b. Loose or worn steering link- b. Tighten or repair (Section 6E or Section 9F) c. Steering cylinder internal c. Repair (Section 6D) leakage d.

  • Page 81: Steering Valve

    SECTION 6C. STEERING VALVE GENERAL 1.Using a portable filtering unit, vacuum pump, or suitable container, drain the hydraulic oil or install The power steering valve uses hydraulic flow produced a vacuum pump on the hydraulic tank fill port. by the charge pump within the traction pump. A pres- 2.Remove the steering tower cover (Figure 6C-1).

  • Page 82: Steering Valve Disassembly

    STEERING VALVE DISASSEMBLY NOTICE NOTICE The following steps reference Figure 6C-2 unless Before attempting repairs or disassembly of any otherwise noted. hydraulic components, thoroughly clean the compo- nents and work area. A clean work area is essential 9. Place the power steering service fixture to satisfactory operation of repaired hydraulic com- (Figure 6A-1) securely in a vise.

  • Page 83: Steering Valve Inspection

    2. Inspect the finished ground surfaces of all the components. NOTICE 3. Inspect the slot edges and surface for nicks, scor- ing, and rounding. The metering package should be disassembled for NOTICE inspection purposes only. Proceed with STEP 17 for disassembly and inspection procedures.
  • Page 84 2. Place the tube (27) and special bolts (25) in the 12.Install the commutator ring (3) and commutator service fixture. cover (2), flat surface down with ring screw recesses, stator screw slots, and cover screw 3. Install a new retaining ring (24) on the shaft (26) holes aligned.
  • Page 85 23.Install three 0.5 in (13 mm) springs (10) into the insolation manifold (13) and install the valve ring (8). STEP 30 STEP 25 STEP 24 STEP 5 Steering Wheel Nut Figure 6C-5. Steering Valve Assembly 24.Install the valve plate (9) as shown (closed cylin- 27.Install the o-rings (4) and seal ring (3) on the port der up) in the valve ring (8), aligning the spring cover (2).

  • Page 86: Installation

    Figure 6C-6. Metering Package Assembly Figure 6C-7. Alignment Grooves 30.Install the lock nuts (1). Tighten the lock nuts grad- INSTALLATION ually in sequence to 20-24 ft-lbs (27-33 Nm) torque, (Figure 6C-5). 1. Place the steering valve in the steering valve bracket with the four studs protruding through the bracket.

  • Page 87: Steering Cylinder

    SECTION 6D. STEERING CYLINDER GENERAL REMOVAL The steering cylinder is attached to the steering axle 1. Shut off the engine and remove the ignition key. between the right side of the axle and the left steering 2. Block the wheels and set the parking brake. arm.

  • Page 88: Disassembly

    DISASSEMBLY INSPECTION NOTICE WARNING When removing the ball joint, count the number of Use appropriate eye protection when using com- turns for removal. This will aid in replacing the ball pressed air for cleaning or drying purposes. Com- joint. pressed air can cause serious personal injury. Use safety reduction valves to reduce the air pressure to 1.

  • Page 89: Assembly

    ASSEMBLY 3. Follow the steps illustrated in Figure 6D-4 for assembly. 1. Install the seal kit as shown in Figure 6D-5. NOTICE 2. Lubricate all parts with clean hydraulic oil before assembly. Install the ball joint, using the same number of turns as noted during removal.
  • Page 90 5. Start the engine and turn steering wheel stop to 7. Check the steering toe-in and turn stop adjust- stop in both directions to purge air from cylinder. ments as described in this section and in the Parts and Maintenance manual. 6.

  • Page 91: Steering Adjustments

    SECTION 6E. STEERING WHEEL ADJUSTMENT STEERING ADJUSTMENTS 1. Turn the wheel to the straight ahead position. 2. Loosen the jam nuts (Q) on both sides of the tie rod (R), (Figure 6E-1). 3. Turn the tie rod (R) to provide proper toe-in. Toe-in should be set to 0.0625 in (1.5 mm) (S), (Figure 6E-1).
  • Page 92 Page Intentionally Blank 6E-16...
  • Page 93 WHEELS AND TIRES SECTION 7 WHEELS AND TIRES Repair, Service Tools, and Materials ......................1 Materials Required ........................... 1 Specifications ............................1 Failure Analysis .............................. 3 General ..............................3 Tire Service..............................5 General ..............................5 Service ..............................5...
  • Page 94 WHEELS AND TIRES Page Intentionally Blank...

  • Page 95: Materials Required

    WHEELS AND TIRES SECTION 7A. REPAIR, SERVICE TOOLS, AND MATERIALS MATERIALS REQUIRED Standard automotive hand tools Tools required: Stoddard solvent or equivalent Cleaning materials: Refer to Section 11 Lubricants: Commercial tire sealant Other service items: Tire pressure gauge Compressed air source with inflation tool SPECIFICATIONS Tire Pressure Tire Pressure Front.........................10-12 psi (69-83 kPa)
  • Page 96 WHEELS AND TIRES Page Intentionally Blank 7A-2...

  • Page 97: General

    WHEELS AND TIRES SECTION 7B. FAILURE ANALYSIS GENERAL references to detailed descriptions of remedial pro- cedures. The following table lists common problems, proba- ble causes, and suggested remedies with section PROBLEM PROBABLE CAUSE REMEDY 1. Tractor rides hard h. Over-inflated tires a.
  • Page 98 WHEELS AND TIRES Page Intentionally Blank 7B-4...

  • Page 99: General

    WHEELS AND TIRES SECTION 7C. TIRE SERVICE GENERAL reduce the tire pressure to the desired level for opera- tion, (Figure 7C-1). The tires are subject to damage from sharp objects. If NOTICE large punctures or tears occur, take the tire (on the wheel) to a qualified tire repair shop.
  • Page 100 WHEELS AND TIRES Page Intentionally Blank 7E-6...
  • Page 101 HYDRAULICS SECTION 8 HYDRAULICS Repair, Service Tools, and Materials ......................3 Materials Required ........................... 3 Specifications ............................5 Failure Analysis .............................. 7 General ..............................7 General Instructions............................9 General ..............................9 Hydraulic Tube and Hose Fittings ......................9 37° Flare Fittings ............................ 10 Hose Installation Instructions .........................
  • Page 102 General ..............................69 Removal ..............................69 Repair..............................69 Installation .............................. 72 Rear (4 Wheel Drive) Traction Motor Repair ....................73 General ..............................73 Removal ..............................73 Repair..............................73 Installation .............................. 76 4 Wheel Drive Control Valve Repair ......................77 General ..............................77 Removal ..............................
  • Page 103 Disassembly............................123 Assembly.............................. 124 Installation ............................125 Reel Valve Repair ............................127 General ..............................127 Removal ............................... 127 Installation ............................127 Reel Motor Repair............................129 General ..............................129 Removal ............................... 129 Installation ............................129 Oil Cooler Repair ............................131 General ..............................131 Removal ...............................
  • Page 104 Page Intentionally Blank...

  • Page 105: Materials Required

    Stoddard solvent or equivalent Cleaning materials: Detergent and water Loctite “Locquic” Primer “T” Refer to (Section 11) Lubricants: Seal and Repair Kits (available from Jacobsen deal- ers) Liquid gasket Special bearing mandrel Other service items: Front Traction Motor Repair JAC 5052...
  • Page 106 12" 2" 1" 2" 12" 14" 16" 3/4" NC Ready Rod 15" Long 36" 1" Pipe Cut to Fit Between Runners 2-3/4" NC Nuts 12" 1" Pipe 2" 13-1/2" Long Two Cargo Straps 3" Wide 12' Long Figure 8A-2. Wheel Restraint 8A-4...

  • Page 107: Specifications

    SPECIFICATIONS Traction Pump Traction Pump Displacement....................1.35 ci/rev (22.1 cc/rev) Traction Pump Volume @ 3150 RPM..................18.4 gpm (69.6 lpm) Traction Circuit Reliefs.........................3045 psi (210 Bar) Charge Pump Displacement....................0.425 ci/rev (6.96 cc/rev) Charge Pump Volume @ 3150 RPM.....................5.8 gpm (22 lpm) Charge Circuit Relief - 2011 and Prior Models..............58-102 psi (400-703 kpa) Charge Circuit Relief - 2011 and Later Models............145-203 psi (1000-1400 kpa) Steering Relief..........................1160 psi (80 Bar) Traction Motors...
  • Page 108 Charge Filter - 2011 Units and Later Charge Filter Element........................Full Flow 10 Micron Charge Filter Bypass Differential Pressure..................25 psid (172 kpa) Reservoir Reservoir Cap Pressure........................3 psi (20.6 kpa) Reservoir Cap Vent.........................10 Micron Foam Vent Reservoir Capacity......................8 U.S. Gal (30.28 liters) Fluid Type (Biodegradeable)....................Jacobsen GreensCare 68 8A-6...

  • Page 109: General

    SECTION 8B. FAILURE ANALYSIS GENERAL The following table lists common problems, probable causes, and suggested remedies with section refer- ences to detailed descriptions of remedial procedures. PROBLEM PROBABLE CAUSE REMEDY 1. System noisy a. Oil cold a. Let oil warm up b.
  • Page 110 PROBLEM PROBABLE CAUSE REMEDY 5. No 4 wheel drive a. Faulty 4 wheel drive valve a. Repair (Section 8K) b. Faulty crossover relief valve b. Repair (Section 8H) c. Rear traction motor faulty c. Repair (Section 8J) d. Low charge pressure d.

  • Page 111: General

    • Discard all seals and o-rings as they are removed. FITTINGS Install new seals and o-rings during reassembly. Most seals are available in component kit form from your Jacobsen dealer. WARNING CAUTION To avoid serious bodily injury, always lower mower...

  • Page 112: 37° Flare Fittings

    37° FLARE FITTINGS Thread Tube Torque In- # of Flat Dash Size O.D. Rotations Torque Recommendations Size 1/2-20 0.312 170-190 3 1/4:3 3/4 1. Assemble tube nut adapter to fitting with a mini- mum torque (finger tight) until the flare contact the 9/16-18 0.375 215-245...

  • Page 113: Ors (Face Seal) Fittings

    Replacement o-rings for o-ring Boss O-ring Boss Torque Recommendations Fittings SAE Dash Thread Torque Tube O.D. Size Size In-lbs 3/8-24 0.188 96-120 Tubing O.D. Jacobsen Thread Size or Hose I.D. Part No. 7/16-20 0.250 168-192 1/2-20 0.312 216-240 5/16-24 459290 9/16-18 0.375...
  • Page 114 Replacement o-ring for ORS Fittings Table 8C-1: O-ring Face Seal Torque Recommendations ORS O-ring Jacobsen SAE Dash Thread Torque ORS Tube Size Tube O.D. Size Part No. Size Size In-lbs 339908 339909 9/16 0.250 120-144 339910 339911 11/16 0.375 216-240...

  • Page 115: General

    SECTION 8D. HYDRAULIC SCHEMATICS GENERAL Several changes was implemented in 2011 to the Hydraulic Traction Circuit. The traction pump incorpo- rated a hardened charge pump coupling, hardened charge relief valve poppet and seat, increased charge pressure from 58-102 psi (400-703 kpa) to 145-203 psi (1000-1400 kpa) and a charge filter was added to the hydraulic circuit.

  • Page 116: Schematic - 2011 & Prior

    SCHEMATIC - 2011 & PRIOR Hydrostatic Forward Relief Valve Traction 3045 psi Pump Valve Check Valve Relief Valve 1160 psi 1.35 ci Gear 0.39 0.39 0.39 0.425 3150 50 rpm Pump Charge Reverse Check Relief Relief Valve Valve Valve Charge 3045 psi Pump 58-102 psi...
  • Page 117 Schematic - 2011 & Prior Forward Front 11.9 Valve 11.9 Wheel Motors 4WD Solenoid Check Valve Reverse Check Valve Right Rear Wheel Motor 7.97 Left Rear Wheel Motor 7.97 TN2503 Figure 8D-2. Hydraulic Schematic - 2011 & Prior Units 8D-15...
  • Page 118 Schematic - 2011 & Prior Steering Unit Check Valve Steering Valve Steering Cylinder TN2504 Figure 8D-3. Hydraulic Schematic - 2011 & Prior Units 8D-16...
  • Page 119 Schematic - 2011 & Prior Center Right Front Left Front Cylinder Cylinder Cylinder One-Way Orifice One-Way Orifice One-Way Orifice 0.032 0.032 0.032 Right Rear Left Rear Cylinder Cylinder One-Way Orifice 0.026 One-Way Orifice 0.040 in. 0.026 One-Way Orifice 0.026 Check Check Check Valve...
  • Page 120 Schematic - 2011 & Prior Rear Reel Valve Solenoid Valve Left Rear 0.60 ci Reel Motor Backlap Valve Right Rear 0.60 ci Reel Motor Relief Valve Test 2200 psi Port Front Reel Valve Right Front Solenoid 0.60 ci Valve Reel Motor Backlap Valve Center...

  • Page 121: Schematic- 2011 & Later

    SCHEMATIC- 2011 & LATER Hydrostatic Forward Relief Valve Traction 3045 psi Pump Valve Check Valve Relief Valve 1160 psi 1.35 ci Gear 0.39 0.39 0.39 0.425 3150 50 rpm Pump Charge Reverse Check Relief Relief Valve Valve Charge Valve 3045 psi 145-203 psi Pump 10 Micron...
  • Page 122 Schematic Continued - 2011 & Later Forward Front Valve 11.9 11.9 Wheel Motors 4WD Solenoid Check Valve Reverse Check Valve Right Rear Wheel Motor 7.97 Left Rear Wheel Motor 7.97 TN2503 Figure 8D-7. Hydraulic Schematic - 2011 & Later Units 8D-20...
  • Page 123 Schematic Continued - 2011 & Later 10 Micron Filter Charge Filter 25 psi Bypass Steering Unit Check Valve Steering Valve Steering Cylinder TN2504-A Figure 8D-8. Hydraulic Schematic - 2011 & Later Units 8D-21...
  • Page 124 Schematic Continued - 2011 & Later Center Right Front Left Front Cylinder Cylinder Cylinder One-Way Orifice One-Way Orifice One-Way Orifice 0.032 0.032 0.032 Right Rear Left Rear Cylinder Cylinder One-Way Orifice 0.026 One-Way Orifice 0.040 in. 0.026 One-Way Orifice 0.026 Check Check Check...
  • Page 125 Schematic Continued - 2011 & Later Rear Reel Valve Solenoid Valve Left Rear 0.60 ci Reel Motor Backlap Valve Right Rear 0.60 ci Reel Motor Relief Valve Test 2200 psi Port Front Reel Valve Right Front Solenoid 0.60 ci Valve Reel Motor Backlap Valve...
  • Page 126 Page Intentionally Blank 8D-24...

  • Page 127: Traction Circuit-Neutral Schematic And Theory Of Operation

    SECTION 8E. TRACTION CIRCUIT THEORY OF OPERATION TRACTION CIRCUIT—NEUTRAL traction pump rotating group and the tow valve, and exits the hydrostatic traction pump at ports “A” and “B.” SCHEMATIC AND THEORY OF The oil is then routed in parallel to the front wheel OPERATION motors, port “A”...
  • Page 128 Traction Circuit—Neutral Schematic Hydrostatic Forward Traction Relief Valve Pump 3045 psi Valve Check Valve Relief Valve 1160 psi 1.35 ci 0.425 Gear Pump 0.39 ci 0.39 ci 0.39 ci 3150 50 rpm Reverse Check Charge Relief Valve Valve Relief Charge 3045 psi Valve Pump...
  • Page 129 Traction Circuit—Neutral Schematic, Continued Forward Front Valve Wheel 11.9 ci 11.9 ci Motors 4WD Solenoid Check Reverse Valve Check Valve Right Rear Wheel Motor 7.97 Left Rear Wheel Motor 7.97 Inlet or Drain Oil Charge Pressure Oil TN2518 Figure 8E-2. Traction Circuit - Neutral 3 Charge Pressure Oil from traction Pump (Port A) 5 Front Wheel Motor Case Drain Oil to Lift Valve (Port T) 4 Charge Pressure Oil from Traction Pump (Port B)
  • Page 130 Page Intentionally Blank 8E-28...

  • Page 131: Traction Circuit-Forward 2Wd Schematic And Theory Of Operation

    TRACTION CIRCUIT—FORWARD Traction Drive Circuit 2WD SCHEMATIC AND THEORY OF When the traction pedal is moved to the FORWARD position, operating pressure oil from the traction pump OPERATION rotating group is routed to the combination check valves/3045 psi (210 bar) relief valves and the tow System Conditions: valve, and exits the traction pump at port “A.”...
  • Page 132 Traction Circuit—Forward 2WD Schematic Hydrostatic Forward Relief Valve Traction 3045 psi Pump Valve Check Valve Relief Valve 1160 psi 1.35 ci 0.425 Gear Pump 0.39 ci 0.39 ci 0.39 ci 3150 50 rpm Charge Check Relief Reverse Valve Charge Valve Relief Valve Pump 145-203 psi...
  • Page 133 Traction Circuit—Forward 2WD Schematic, Continued Forward Front Wheel 11.9 ci 11.9 ci Valve Motors 4WD Solenoid Check Reverse Valve Check Valve Right Rear Wheel Motor 7.97 Left Rear Wheel Motor 7.97 Charge Pressure Oil Inlet or Drain Oil Operating Pressure Oil TN2520 Figure 8E-4.
  • Page 134 Page Intentionally Blank 8E-32...

  • Page 135: Traction Circuit-Reverse 2Wd Schematic And Theory Of Operation

    TRACTION CIRCUIT—REVERSE then routed to the front wheel motors, driving the motors. Oil exiting the front wheel motors is routed to 2WD SCHEMATIC AND THEORY OF port “A” of the traction pump to replenish the intake OPERATION side of the traction pump rotating group. Operating pressure oil is also supplied to the check System Conditions: valve at port “B”...
  • Page 136 Traction Circuit—Reverse 2WD Schematic Hydrostatic Forward Traction Relief Valve Pump 3045 psi Valve Check Valve Relief Valve 1160 psi 1.35 ci 0.425 Gear Pump 0.39 ci 0.39 ci 0.39 ci 3150 50 rpm Charge Check Valve Relief Reverse Charge Valve Relief Valve Pump 145-203 psi...
  • Page 137 Traction Circuit—Reverse 2WD Schematic, Continued Forward Front Valve Wheel 11.9 ci 11.9 ci Motors 4WD Solenoid Check Valve Reverse Check Valve Right Rear Wheel Motor 7.97 Left Rear Wheel Motor 7.97 Charge Pressure Oil Inlet or Drain Oil Operating Pressure Oil TN2522 Figure 8E-6.
  • Page 138 Page Intentionally Blank 8E-36...

  • Page 139: Traction Circuit-Forward 4Wd Schematic And Theory Of Operation

    TRACTION CIRCUIT—FORWARD then routed to the front wheel motors, driving the motors. Oil exiting the front wheel motors is routed to 4WD SCHEMATIC AND THEORY OF port “B” of the traction pump to replenish the intake OPERATION side of the traction pump rotating group. Operating pressure oil is also routed to port “A”...
  • Page 140 Traction Circuit—Forward 4WD Schematic Hydrostatic Forward Traction Relief Valve 3045 psi Pump Valve Check Valve Relief Valve 1160 psi 1.35 ci 0.425 Gear Pump 0.39 ci 0.39 ci 0.39 ci 3150 50 rpm Charge Check Reverse Relief Valve Charge Relief Valve Valve Pump 3045 psi...
  • Page 141 Traction Circuit—Forward 4WD Schematic, Continued Forward Front 11.9 ci Valve Wheel 11.9 ci Motors 4WD Solenoid Check Valve Reverse Check Valve Right Rear Wheel Motor 7.97 Left Rear Wheel Motor 7.97 Charge Pressure Oil Inlet or Drain Oil Operating Pressure Oil TN2524 Figure 8E-8.
  • Page 142 Page Intentionally Blank 8E-40...

  • Page 143: General

    SECTION 8F. TRACTION CIRCUIT FIELD TEST GENERAL 2. Check all lines and fittings for leakage and tighten as necessary (Section 8C). When a hydraulic failure occurs, some simple, effective NOTICE tests can be performed prior to using a test instrument. The results of these tests can lead you to the sus- pected component failure.

  • Page 144: Front Traction Motor Test

    hydrostatic drive circuit, including the traction pump, 4. Position a drain pan (minimum capacity 1 gallon front wheel motors or 4WD valve. Proceed with an (3.8 liters)) near the wheel motor. Instrument Test (Section 8G). 5. Install a separate test hose on the case drain fit- ting and place the free end in the container.

  • Page 145: General

    SECTION 8G. TRACTION CIRCUIT INSTRUMENT TESTS GENERAL The tests in this section are provided as a means of WARNING isolating problems in the hydraulic system This section uses two test methods to identify a prob- To avoid serious bodily injury, always lower mower lem or to evaluate a hydraulic circuit.

  • Page 146: Pressure Tests

    Con- tact your local Jacobsen dealer for additional infor- • If charge pressure is not within range the charge mation and assistance.
  • Page 147 0 to 500 psi (0 to 3447 kPa) Gauge Steering Unit Auxiliary Port Charge Relief Valve Figure 8G-2. Charge Pressure Test 8G-45...

  • Page 148: Flow Tests

    FLOW TESTS before performing the test to ensure proper test results. Read and understand the flow meter directions and Follow the directions for each test carefully. The instructions before attempting to test the hydraulic sys- hydraulic oil must be at normal operating temperature tem (Figure 8G-3).

  • Page 149: Steering Circuit Test

    • If pressure drops off before reaching range, steering • If steering relief valve pressure is not in the specified range in one or both positions, proceed with Step relief valve or charge pump may be at fault. NOTICE 13.At the steering cylinder, remove both hydraulic lines, plug the lines and cap the cylinder ports.

  • Page 150: Traction Circuit Flow Test

    Charge Pump Outlet Hose Charge Pump Outlet Load Valve Figure 8G-4. Charge pump and Steering Flow Test TRACTION CIRCUIT FLOW TEST NOTICE Before performing this test, be sure tow valve, located on the underside of the traction pump is closed (Figure 8F-1). 8G-48...

  • Page 151: Traction Pump Flow Test

    TRACTION PUMP FLOW TEST 1. Set up flow meter for a “T” test to minimize flow meter test connections while testing the traction circuit. (Figure 8G-5). Traction Pump Flow Test Blocking Disc Bottom Hydro Port Top Hydro Port “Forward” “Reverse” Top Hydraulic Line “Reverse”...
  • Page 152 11. Open flow meter load valve, set parking brake, CAUTION reel switch off, start engine and advance throttle to high idle position. When using a plug to block a pressure line the plug 12.Adjust flow lock tool to obtain 10 gpm (37.8 lpm) must be able to withstand the pressure developed in no load flow on the flow meter (Figure 8G-6).

  • Page 153: Front Traction Motor Flow Test

    FRONT TRACTION MOTOR FLOW 19.Remove blocking disc inserted between flow meter hoses and “T” fittings on hydraulic lines TEST located behind front axle and reconnect flow meter hydraulic lines to “T” fittings. (Figure 8G-5). NOTICE 20.Install blocking disc at the locations indicated in (Figure 8G-7) to test the right front traction motor.
  • Page 154 front traction motor will require repair or 25.Remove blocking disc inserted between “T” fit- replacement. tings on hydraulic lines located behind front axle and reconnect hydraulic lines to “T” fittings. 24.Open tester load valve, slow engine to idle speed (Figure 8G-7). and shut off engine.

  • Page 155: 4Wd Valve Flow Test

    4WD VALVE FLOW TEST • If flow drops 0.5 to 1.5 gpm (1.9 to 5.6 lpm), the left front traction motor is marginal. NOTICE • If flow drops more than 2 gpm (7.6 lpm), perfor- mance will be noticeably reduced. The left front traction motor will require repair or replace- Before performing this test, a traction pump flow test ment.

  • Page 156: Rear Traction Motor Flow Test

    REAR TRACTION MOTOR FLOW • If flow drops 0.5 to 1.0 gpm (1.9 to 3.8 lpm), the 4WD valve is marginal. TEST • If flow drops more than 1 gpm (3.8 lpm), perfor- mance will be noticeably reduced. The 4WD Right Rear Traction Motor Flow Test valve will require repair or replacement.
  • Page 157 • If flow drops 0.5 gpm (1.9 lpm) or less, right 43.Remove blocking disc inserted between left rear rear traction motor is okay, proceed to Left traction motor ports and hoses (Figure 8G-9). Rear Traction Motor Flow Test. 44.All blocking disc are removed to test the left rear •...
  • Page 158 Figure 8G-11. Left Rear Traction Motor Flow Test 45.Open flow meter load valve, set parking brake, reel switch off, start engine and advance throttle to high idle position. 46.Slowly close tester load valve until 2200 psi (152 Bar) is obtained. 47.Read/record gpm (lpm) flow on Traction Circuit Test Record (Figure 8G-13).

  • Page 159: Charge Pump Test Record

    Charge Pump Test Record SLF 1880 Charge Circuit Test Record Model:__________ Serial_________ Hours of Use_________ Date:__________ Hydraulic oil Temperature when test performed............____________ Engine high idle speed..................... ____________ Charge Circuit Pressure Test 145 to 203 psi (1000 to 1400 kpa) - 2011 Units A) Step 4 - Page 8G-38 - Charge pressure 54 to 66 psi (372 to 455 kPa)....(____________)

  • Page 160: Traction Circuit Test Record

    Traction Circuit Test Record SLF 1880 Traction Circuit Test Record Model:__________ Serial_________ Hours of Use________ Date:__________ Hydraulic oil Temperature when test performed............. ____________ Engine high idle speed................... ____________ Traction Pump Pressure Test - Page 8G-43 10 gpm (37.8 lpm) A) Step 12 - Traction Pump no load flow (use flow lock tool)......... ____________ B) Step 14 - Traction pump flow @ 2200 psi (151.7 Bar)........

  • Page 161: General

    The pistons have shoes repairs to the traction pump or motor. A suitable high that ride against a swiveling swashblock. By swiveling pressure filter such as the Jacobsen 5097 is recom- the swashblock the piston stroke is extended on one mended.
  • Page 162 Control Valve Plate/Charge Housing Pump Assembly Rotating Rear Valve Group Plate Coupling Assembly Input Shaft & Bearing Assembly Rear Cover (Not Used on LF 1880) Main Case & Input Shaft Swashblock Gerotor Pump Rear Valve Plate Assembly Main Case and Input Shaft Valve Plate Charge Pump...

  • Page 163: Removal

    REMOVAL 8. Remove the traction pump and reel pump from the frame. 1. Shut off the engine and remove the ignition key. 9. Remove the two socket head capscrews that Allow the engine to cool completely. secure the reel pump to the traction pump. 2.
  • Page 164 Valve Plate And Gerotor Bypass Pressure Relief Valve Rear Valve Plate O Rings Coupler Gerotor Pump Bushing Cross-Port Steering Relief Valve Relief Valve Retaining Ring Valve Plate Cross-Port Tow Valve Relief Valve Figure 8H-4. Valve Plate and Gerotor Pump Disassembly CAUTION Use extreme care to avoid damaging parts and wear surfaces of rotating group and associated parts...
  • Page 165 Rotating Group Shoe Retainer Spring Shoe Retainer Cylinder Pistons Barrel Ball Retaining Fulcrum Ring Hydrodynamic Bearing O-Ring Figure 8H-5. Rotating Group Disassembly Drive Shaft Group Figure 8H-6. Drive Shaft Group Disassembly 8H-63...

  • Page 166: Inspection

    Swashblock Group (Figure 8H-7) 1. Place square end of piston on a bench and hold firmly. 2. Pull on the end of the hose with the other hand Swashblock and note the end play. A good piston/shoe fit will Saddle have no end play with the shoe free to rotate and Bearings pivot on the piston ball.

  • Page 167: Assembly

    ASSEMBLY Swashblock (Figure 8H-9) Position the hydrodynamic bearing into the housing so that the pin is at the 8 o’clock position between protru- sion and pump housing to assure CCW rotation. Retaining Ring Hydrodynamic Bearing Swashblock Saddle Bearings Shaft Seal (Flush with Main Case Housing)
  • Page 168 Rotating Group Assembly Install the shoe retainer with the center curved surface NOTICE toward the fulcrum ball (Figure 8H-11). Do not force pistons into barrel. The pistons should fit loosely. Cylinder Barrel Shoe Retainer Pistons Main Case Assembly Figure 8H-11. Rotating Group Assembly Valve Plate, Gerotor Pump, Rear Plate Assembly (Figure 8H-12) Figure 8H-12.
  • Page 169 Control Group Assembly (Figure 8H-13) Traction Pump Assembly Gasket Control Pin Arm and Pintle O-Ring Control Housing O-Ring Figure 8H-13. Control Group Assembly 8H-67...

  • Page 170: Installation

    INSTALLATION 4. Install the drive shaft on the traction pump input shaft and engine. 1. Using a new o-ring lubricated with clean hydraulic 5. Replace the hydraulic oil filter and fill the hydraulic oil, position the reel pump on the traction pump tank with hydraulic oil.
  • Page 171 SECTION 8I. FRONT TRACTION MOTOR REPAIR GENERAL 8. Tag and disconnect the hydraulic hoses from the motor. Immediately plug the hoses and motor to The traction pedal and traction pump control the front prevent contamination of the hydraulic system. traction motors. The motor is mounted inside the front 9.
  • Page 172 Port Manifold Cover* Spring Capscrews & Pin Valve Valve Plate Drive Outer Face Seal Link Balance Ring Gerotor Wear Plate Seals Shaft Drive Seal Shaft Shaft & Bearing Assembly Backup Ring Dust Seal Figure 8I-3. Front Traction Motor NOTICE During assembly, position the seals, seal rings, and backup ring properly (Figure 8I-4).
  • Page 173 6. Install the seals and backup ring in the flange end 8. Install the shaft face seal as shown in (Figure 8I- as shown in (Figure 8I-5). 6). Place the wear plate on the flange end. Dust Shaft Seal Seal Mounting Shaft &...
  • Page 174 11. Install the balance ring on the valve with the pin groove facing upwards. NOTICE 12.Coat the springs and pins with petroleum jelly. Install both springs and pins in the holes of the Be sure the gerotor, valve plate, and valve are timed manifold cover.
  • Page 175 SECTION 8J. REAR (4 WHEEL DRIVE) TRACTION MOTOR REPAIR GENERAL 8. While supporting the motor, remove the four mounting bolts and lock washers, (Figure 8J-2). The traction pedal and traction pump control the rear 9. Remove the motor from the motor mount. traction motors.

  • Page 176: Assembly

    Port Manifold Cover* Spring Capscrews & Pin Valve Valve Plate Drive Outer Face Seal Link Balance Ring Gerotor Wear Plate Seals Shaft Drive Seal Shaft Shaft & Bearing Assembly Backup Ring Dust Seal Figure 8J-3. Rear Traction Motor NOTICE During assembly, position the seals, seal rings, and backup ring properly (Figure 8J-4).
  • Page 177 6. Install the seals and backup ring in the flange end 8. Install the shaft face seal as shown in (Figure 8J- as shown in (Figure 8J-5). 6). Place the wear plate on the flange end. 7. Press the bearing and shaft assembly into the flange end of the motor.

  • Page 178: Installation

    11. Install the balance ring on the valve with the pin groove facing up. NOTICE 12.Coat the springs and pins with petroleum jelly. Install both springs and pins in the holes of the Be sure the Gerotor, valve plate, and valve are timed manifold cover.

  • Page 179: General

    SECTION 8K. 4 WHEEL DRIVE CONTROL VALVE REPAIR GENERAL REPAIR The 4 wheel drive control valve is mounted on the The 4 wheel valve repairs are limited to changing o- frame below the engine. rings, backup rings, and coil. The valve can be replaced as an assembly (Figure 8K-1).
  • Page 180 Page Intentionally Blank 8K-78...
  • Page 181 SECTION 8L. HYDRAULIC CIRCUITS THEORY OF OPERATION STEERING CIRCUIT SCHEMATIC AND THEORY OF OPERATION System Conditions: • Engine running • Steering wheel turned to the right or left (left turn shown) Oil Supply to Steering Unit Hydraulic oil is drawn from the hydraulic oil tank by the charge pump.
  • Page 182 Steering Circuit Schematic Steering Unit Check Valve Steering Valve Charge Pressure oil Operating Pressure Oil Metered Oil Return Oil TN2512 1 Operating Pressure Oil from Charge Pump Outlet 2 Charge Pressure Oil to Hydrostatic Traction Pump 8L-80...
  • Page 183 RAISE CIRCUIT SCHEMATIC AND THEORY OF OPERATION System Conditions: • Engine running at fast idle • Mower lift lever in the RAISE position NOTICE The cutting unit motors will automatically shut off as the cutting units are raised. Oil Supply to the Lift Valve Hydraulic oil is drawn from the hydraulic oil tank by section 3 of the gear pump assembly.
  • Page 184 Raise Circuit Schematic Right Front Left Front Center Cylinder Cylinder Cylinder One-Way One-Way One-Way Orifice Orifice Orifice 0.032 in. 0.032 in. 0.032 in. Right Rear Left Rear Cylinder Cylinder One-Way Orifice 0.026 in. One-Way 0.040 in. Orifice One-Way 0.026 in. Orifice 0.026 in.
  • Page 185 LOWER CIRCUIT SCHEMATIC AND THEORY OF OPERATION System Conditions: • Engine running • Mower lift lever in the LOWER position Oil Supply to Lift Valve Hydraulic oil is drawn from the hydraulic oil tank by section 3 of the gear pump assembly. Operating pres- sure oil from section 3 of the gear pump is routed to the lift valve.
  • Page 186 Lower Circuit Schematic Right Front Center Left Front Cylinder Cylinder Cylinder One-Way One-Way One-Way Orifice Orifice Orifice 0.032 in. 0.032 in. 0.032 in. Right Rear Left Rear Cylinder Cylinder One-Way Orifice 0.026 in. One-Way 0.040 in. Orifice One-Way 0.026 in. Orifice 0.026 in.
  • Page 187 MOW CIRCUIT (ON) SCHEMATIC restricts oil flow, the valve(s) will open to allow oil to bypass the return filter (or oil cooler) to allow oil to flow AND THEORY OF OPERATION to the hydraulic tank. Hydraulic oil is used to lubricate the internal compo- System Conditions: nents of pumps and motors.
  • Page 188 Mow Circuit (ON) Schematic Rear Reel Valve Left Rear 0.60 ci Reel Motor Solenoid Valve Backlap Valve Right Rear 0.60 ci Reel Motor 2200 psi Test Relief Port Valve Front Reel Valve Right Front 0.60 ci Reel Motor Solenoid Valve Backlap Valve Center...
  • Page 189 BACKLAP CIRCUIT SCHEMATIC Oil Return AND THEORY OF OPERATION Return oil from the reel motors enters the reel valves at port “A” and flows through the solenoid valves to the oil cooler, return filter, and then the hydraulic tank. System Conditions: The return filter and oil cooler are equipped with crack •...
  • Page 190 Backlap Circuit Schematic Rear Reel Valve Solenoid Valve Left Rear 0.60 ci Reel Motor Backlap Valve Right Rear 0.60 ci Reel Motor Relief Test Valve Port 2200 psi Front Reel Valve Right Front Solenoid 0.60 ci Reel Motor Valve Backlap Valve Center 0.60 ci...

  • Page 191: General

    SECTION 8M. HYDRAULIC FIELD TEST PROCEDURES GENERAL 2. Check all lines and fittings for leakage and tighten as necessary (Section 8C). When a hydraulic failure occurs, some simple, effective NOTICE tests can be performed prior to using a test instrument. The results of these tests can lead you to the sus- pected component failure.
  • Page 192 10.Remove the floor jack, start engine and hold joy- • If oil flows from the cylinder test hose, the cylinder is stick in the raise position, observe the open end of bypassing oil and must be replaced or repaired. test hose in the container. 11.
  • Page 193 Steering Cylinder Steering Unit Steering Cylinder Steering Cylinder Hoses Figure 8M-2. Steering System MOWER (REEL MOTOR) SYSTEM 1. Shut off the engine and remove the ignition key. TEST 2. Remove the case drain hose from the reel motor to be tested. (Figure 8M-3) Immediately plug the The reel motor circuit consists of the reel (auxiliary) hose.
  • Page 194 8. Measure the amount of oil collected from the case • If the oil from the case drain is over 1 gpm (3.8 lpm) drain and multiply by 4 to get the leakage in gal- the motor should be repaired or replaced. lons or liters per minute (gpm) or (lpm).
  • Page 195 SECTION 8N. HYDRAULIC INSTRUMENT TESTS GENERAL The tests in this section are provided as a means of WARNING isolating problems in the hydraulic system This section uses two test methods to identify a prob- To avoid serious bodily injury, always lower mower lem or to evaluate a hydraulic circuit.
  • Page 196 The steering relief valve cannot be repaired or problem encountered within a hydraulic system Con- adjusted. Replace if damaged or faulty (Figure 8N- tact your local Jacobsen dealer for additional infor- mation and assistance. 7. Remove steering system relief valve plug, spring, PRESSURE TESTS and cone.
  • Page 197 0 to 2000 psi (0 to 138 Bar) Gauge Steering Unit Inlet Relief Valve Steering Figure 8N-2. Steering Circuit Test LIFT CIRCUIT PRESSURE TEST • If the relief valve exceeds range, replace the relief valve. Lift Circuit • If the relief valve does not reach range, the reel (auxiliary) hydraulic pump may be at fault.
  • Page 198 Conclusion • If the relief valve does not reach range, perform a reel (auxiliary) hydraulic pump flow test. • If the relief valve opens within range, a lift cylinder is at fault. Isolate the cylinder by shutting off the engine 9.
  • Page 199 Quick Connect Fitting 0 to 2000 psi (0 to 13790 kPa) Figure 8N-4. Lower Circuit Testing 8N-97...
  • Page 200 REEL MOTOR PRESSURE TEST 6. While observing the pressure gauge, place the reel motors in the forward (ON) position. The reel motors can be tested at the reel motor control CAUTION valves. There are two reel motor control valves. One valve controls the front reels while the other controls the center reels.
  • Page 201 FLOW TESTS Read and understand the flow meter directions and instructions before attempting to test the hydraulic sys- Follow the directions for each test carefully. The tem (Figure 8N-6). hydraulic oil must be at normal operating temperature before performing the test to ensure proper test results. Load Valve Flow Meter...
  • Page 202 Charge Pump Outlet Hose Charge Pump Outlet Fitting Load Valve Figure 8N-7. Charge Pump and Steering Flow Test 8N-100...
  • Page 203 FRONT REEL CIRCUIT FLOW TEST Front Reel Pump Section Flow Test 4. Insert blocking disc on flow meter hose connected Section one of the triple gear pumps supplies hydraulic to the reel valve hydraulic line. oil to the front reel valve and circuit. 1.
  • Page 204 8. Slowly close tester load valve until 1600 psi (110 Bar) is indicated on the pressure gauge. Record flow indication (B) on “Front Reel Circuit Test Record” (Figure 8N-13). 9. Subtract flow indication (A) from flow indication (B). The result is section one pump leakage. Conclusion •...
  • Page 205 Front Reel Valve Flow Test 13.Remove the blocking disc from the flow meter inlet hose connected to the hydraulic line connected to Front reel pump flow test must be performed before the front reel valve (Figure 8N-8). performing this test. 14.Insert the blocking disc at the inlet fitting of the Flow meter connections remain the same from the pre- right front reel motor (Figure 8N-9).
  • Page 206 20.Read/record pressure indication (D) on the “Front Reel Circuit Test Record” (Figure 8N-13). Conclusion • Early models reel relief valve pressure was 3000 psi (307 Bar). • Late models (2009) reel relief valve pressure was 2200 psi (152 Bar). 21.Open flow meter load valve and slow engine to low idle speed.
  • Page 207 Right Front Reel Motor Test 30.Open flow meter load valve and slow engine to low idle speed. Front reel pump and front reel valve flow test must be performed before performing this test. 31.Shut off the engine and remove the ignition key. Flow meter connections remain the same from the pre- 32.Proceed to Front Center Reel Motor Flow Test.
  • Page 208 Conclusion • If leakage is ½ to 1 gpm (1.9 to 3.8 lpm), motor is marginal. • If leakage is less that ½ gpm (1.9 lpm), motor is not • If leakage is over 1 gpm (3.8 lpm) motor may be at fault.
  • Page 209 REAR REEL CIRCUIT FLOW TEST Rear Reel Pump Section Flow Test 4. Insert blocking disc on flow meter hose connected Section two (Center Section) of the triple gear pumps to the rear reel valve hydraulic line. supplies hydraulic oil to the rear reel valve and circuit. 1.
  • Page 210 8. Slowly close tester load valve until 1600 psi (110 Bar) is indicated on the pressure gauge. Record flow indication (B) on “Rear Reel Circuit Test Record” (Figure 8N-14). 9. Subtract flow indication (B) from flow indication (A). The result is section two pump leakage. Conclusion •...
  • Page 211 Rear Reel Valve Flow Test 13.Remove the blocking disc from the flow meter inlet hose connected to the hydraulic line connected to Rear reel pump flow test must be performed before the rear reel valve (Figure 8N-10). performing this test. 14.Insert the blocking disc at the inlet fitting of the left Flow meter connections remain the same from the pre- reel motor (Figure 8N-11).
  • Page 212 Rear Reel Valve - Relief Valve Test 19.Continue to close the load valve on flow meter until 0.0 gpm (lpm) is obtained. 20.Read/record pressure indication (D) on the “Rear Reel Circuit Test Record” (Figure 8N-14). Conclusion • Early models reel relief valve pressure was 3000 psi (307 Bar).
  • Page 213 Left Rear Reel Motor Test 30.Open flow meter load valve and slow engine to low idle speed. Rear reel pump and rear reel valve flow test must be performed before performing this test. 31.Shut off the engine and remove the ignition key. Flow meter connections remain the same from the pre- 32.Proceed to Rear Right Reel Motor Flow Test.
  • Page 214 • If leakage is over 1 gpm (3.8 lpm) motor may be 40.Shut off the engine and remove the ignition key. faulty. 41.Remove blocking disc and flow test meter and 39.Open flow meter load valve and slow engine to restore hydraulic hose and line connections. low idle speed.
  • Page 215 LIFT/LOWER CIRCUIT FLOW TEST 5. Slowly close tester load valve until 1000 psi (6894 kPa) is indicated on the pressure gauge. Record flow indication (h). Section three of the reel (auxiliary) hydraulic pump supplies hydraulic flow to the lift valve. 6.
  • Page 216 SLF-1880 REEL CIRCUIT FLOW TEST RECORDS SLF 1880 Front Reel Circuit Test Record Model:__________ Serial_________ Hours of Use________ Date:__________ Hydraulic oil Temperature when test performed............. ____________ Engine high idle speed................... ____________ Front Reel Pump Section (1) Flow Test - Page 8N-93 A) Step 7 - Front Reel Pump (Section 1) no load flow..........
  • Page 217 SLF 1880 Rear Reel Circuit Test Record Model:__________ Serial_________ Hours of Use________ Date:__________ Hydraulic oil Temperature when test performed............. ____________ Engine high idle speed................... ____________ Rear Reel Pump Section (2) Flow Test - Page 8N-99 A) Step 7 - Rear Reel Pump (Section 1) no load flow..........____________ B) Step 8 - Rear Reel Pump flow @ 1600 psi (110 Bar).........
  • Page 218 Page Intentionally Blank 8N-116...
  • Page 219 SECTION 8O. REEL (AUXILIARY) HYDRAULIC PUMP REPAIR GENERAL REMOVAL The reel (auxiliary) hydraulic pump is mounted on the 1. Shut off the engine and remove the ignition key. rear of the traction pump (Figure 8O-1). The traction 2. Remove the seat and seat pan. pump is driven by a the engine using a conventional drive shaft and u-joints.
  • Page 220 DISASSEMBLY 2. Mark the pump sections to ensure proper assem- bly. Using a center punch place one mark on sec- tion 1, two marks on section 2 and three marks on 1. Thoroughly clean the outside of the pump before section 3 (Figure 8O-3).
  • Page 221 3. Use a new seal kit during assembly. Use clean grease to keep seals in position. Marker 4. Remove the alignment mark from gear sets after they have been installed with teeth in mesh. 5. Rotate the drive shaft after assembling each sec- tion to make sure there is no binding between parts.
  • Page 222 Page Intentionally Blank 8O-120...
  • Page 223 SECTION 8P. LIFT/LOWER VALVE REPAIR GENERAL 6. While supporting the valve, remove two mounting screws and lock washers from the bottom of the The lift valve is used in conjunction with the reel (auxil- valve. iary) hydraulic pump and joystick to lift and lower the 7.
  • Page 224 Page Intentionally Blank 8P-122...
  • Page 225 SECTION 8Q. LIFT CYLINDER REPAIR GENERAL INSPECTION The SLF-1880 mower uses five lift cylinders to lift and 1. Inspect all parts for excessive wear, cracks, gall- lower the reels. The cylinders are all the same. ing and broken parts. REMOVAL 2.
  • Page 226 c. Remove the nylon spacer (Figure 8Q-4). f. Pull the rod assembly from the cylinder body (Figure 8Q-7). Nylon Spacer Assembly Figure 8Q-4. Nylon Spacer Figure 8Q-7. Rod Assembly d. Remove head lock ring from inside the cylinder body (Figure 8Q-5). ASSEMBLY Lock Ring 1.
  • Page 227 4. Assemble the cylinder. d. Push the rod guide into the cylinder approxi- mately 0.75 in (Figure 8Q-12). a. Place a small lock ring, nylon spacer, large lock ring, and rod guide onto the rod (Figure 8Q-9). Rod Guide Nylon Spacer Rod Guide 3/4"...
  • Page 228 Page Intentionally Blank 8Q-126...
  • Page 229 SECTION 8R. REEL VALVE REPAIR GENERAL 5. While supporting the valve, remove two mounting screws and lock washers from the bottom of the There are two reel valves used to control the rotation of valve. the reel motors. Both valves are mounted near the front 6.
  • Page 230 Front Center Reel Reel Valve Valve Solenoid Valve Coil Coil Port Plug Relief Knob Valve Flow Control Figure 8R-1. Reel Valve Mounting 8R-128...
  • Page 231 SECTION 8S. REEL MOTOR REPAIR GENERAL INSTALLATION There are five hydraulic reel motors, two center reel 1. Remove plugs and using tags created during motors and three front reel motors (Figure 8S-1). The removal, connect the hydraulic hoses to the motor motors are identical.
  • Page 232 Page Intentionally Blank 8S-130...
  • Page 233 SECTION 8T. OIL COOLER REPAIR GENERAL 5. Tag and disconnect the oil cooler hydraulic hoses. Immediately plug the hoses and oil cooler to pre- The oil cooler is mounted between the seat and vent contamination of the hydraulic system. engine. When hydraulic oil overheats the viscosity of 6.
  • Page 234 Page Intentionally Blank 8T-132...
  • Page 235 SECTION 8U. COMPONENT LOCATIONS Hydraulic Hydraulic Hydraulic Return Filter Charge Filter Tank Front Traction Rear Traction Motor Motor Traction Pump & Reel (Auxiliary) Pump Oil Cooler Rear Traction Front Traction Lift Cylinder Motor Motor Steering Unit Lift/Lower Valve 4WD Valve Reel Valve 8U-133...
  • Page 236 Page Intentionally Blank Figure 8U-1. Component Locations 8U-134...

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