Husqvarna RB150 Workshop Manual
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Husqvarna RB150 Workshop Manual

Husqvarna RB150 Workshop Manual

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RB150, RBH180
Workshop Manual
101 89 07-26

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Summary of Contents for Husqvarna RB150

  • Page 1 RB150, RBH180 Workshop Manual 101 89 07-26...
  • Page 2 CONTENTS INTRODUCTION............1 SAFETY RULES ............2 SAFETY EQUIPMENT..........4 TECHNICAL DATA ............5 SERVICE TOOLS ............7 TROUBLE SHOOTING..........8 ELECTRICAL SYSTEM..........22 ENGINE ..............55 POWER TRANSMISSION .......... 62 STEERING SYSTEM ..........80 BRAKES ..............86 CUTTING UNIT ............90...
  • Page 3 INTRODUCTION General Tools This Workshop Manual provides a detailed description of trouble shooting, repairs and testing of Service tools will be required for certain items. All of the riding mower. A description is also included of the appertaining service tools are listed in this the various precautions that are to be taken in Workshop Manual.
  • Page 4 SAFETY RULES General instructions Special instructions Workshops where the riding mowers are repaired Fuel are to be equipped with safety equipment in The fuel that is used for the riding mower has the compliance with local regulations. following hazardous characteristics: No person that is not conversant with the contents 1.
  • Page 5 SAFETY RULES Blocking up WARNING For maintenance or repairs, the riding mower may never be lifted more than 50 centimetres from its level position unless the following precautions are taken: Empty the fuel tank and run the engine until the carburettor is dry.
  • Page 6 SAFETY EQUIPMENT Description The riding mower is equipped with parts that are necessary to create maximum safety for the user and the surroundings. Safety critical details are as follows: • Brakes • Silencer • Air filter • Shear pins • Plastic covers •...
  • Page 7 TECHNICAL DATA Applies to RB 150, 1996 and 1997 models • Engine 15.5 HP Diamond Plus Briggs & Stratton* • Battery 12 Volt / 22 Ah • Front tyres Size: 15 x 6.00 – 6 Tyre pressure: 100 kPa (1 bar) •...
  • Page 8 TECHNICAL DATA Applies to RBH 180 • Engine 18 HP VANGUARD V-TWIN Briggs & Stratton* • Battery 12 Volt / 22 Ah • Front tyres Size: 16 x 6.50 – 8 Tyre pressure: 100 kPa (1 bar) • Rear tyres Size: 20 x 10.00 –...
  • Page 9 SERVICE TOOLS Description The following service tools are required to carry out certain repairs: Tensioning tool 5310057-01 Tool to stretch the gear-toothed belt in the cutting unit.. 5310057-01 Relief tool Tool to relieve pressure of the clutch spring. 5310057-02 5310057-02 English –...
  • Page 10 TROUBLE SHOOTING Cutting unit Cutting blades of the cutting unit do not rotate. Is the cutting unit fitted Fit the cutting unit. correctly? Is the clutch on the Replace the clutch. engine shaft intact? Right cutting blade of the cutting unit does not rotate.
  • Page 11 TROUBLE SHOOTING Drive belt of the cutting unit is slipping. Is the grass too high or Raise the cutting unit, or too wet? wait until the grass is dry. Is the cutting unit fitted Fit the cutting unit. incorrectly? Is the belt worn or Replace the belt.
  • Page 12 TROUBLE SHOOTING Strong vibration occurs when the cutting unit is engaged. Straighten the blades or Are the cutter blades replace them. deformed? Are the cutter blades out Balance the cutter blades. of balance? Are the cutting blades Tighten the blade screws. loose? Are there burn marks or Replace the gear-toothed...
  • Page 13 TROUBLE SHOOTING Gear-toothed belt on the cutting unit is slipping. Is the gear-toothed belt Adjust the gear-toothed poorly adjusted? belt. Replace the gear-toothed Is the gear-toothed belt belt. worn? Replace the relevant Are gearwheels in the gearwheels. cutting unit worn? Gear-toothed belt in the cutting unit becomes worn too quickly.
  • Page 14 TROUBLE SHOOTING Steering system Do the front wheels point to the left or right when the steering wheel points straight ahead? Adjust the steering sector- Is the steering sector- drive and the steering drive correctly set in pinion. relation to the steering pinion? Replace the steering sector-drive and the...
  • Page 15 TROUBLE SHOOTING Brakes The brake has stopped working. Does spring-return of the Is the spring of the brake No Replace the spring. pedal intact? brake pedal work after the pedal has been pressed down? Is the connection between Replace the damaged brake axle and brake rod part.
  • Page 16 TROUBLE SHOOTING Power transmission The tractor does not move forward when a gear is engaged and the throttle is opened. Is the transmission belt Adjust the transmission correctly stretched? belt. Is the transmission belt Replace the transmission intact? belt. Place the transmission Is the transmission belt belt correctly in position correctly positioned on...
  • Page 17 TROUBLE SHOOTING Electrical system Applies to RBH 180, and RB 150 1996 and 1997 models The engine does not stop when the operator rises from the seat. Does the engine stop Replace relay K2 (the when the ignition is lower one). switched off? Adjust or replace microswitch S7 under the...
  • Page 18 TROUBLE SHOOTING Applies to RBH 180, and RB 150 1996 and 1997 models The engine will not start, although the starter motor rotates, there is fuel in the tank and the fuel cock is open. Is the sparking plug and Correct the fault.
  • Page 19 TROUBLE SHOOTING Applies to RBH 180, and RB 150 1996 and 1997 models The starter motor does not rotate when the key is turned to the starting position. Can a clicking sound be Replace the fuse. Is fuse F1 intact? heard from relay K3 that is located in front of the battery?
  • Page 20 TROUBLE SHOOTING Applies to RB 150, 1996 model The cutting unit does not rotate. Does the cutting unit start Replace the fuse. Is fuse F2 intact? in mode “Man” but not in mode “Auto”? Is there 12 V across Is there 12 V between pin Does the cutting unit start terminals of the clutch? if microswitch S6 for the...
  • Page 21 TROUBLE SHOOTING Applies to RB 150, 1996 model The cutting unit stops and starts again without apparent cause during operation. 1. Replace or adjust Does this happen often microswitch S6 of the when the grass collector grass collector. is not full? 2.
  • Page 22 TROUBLE SHOOTING Applies to RBH 180, and RB 150 1997 models The cutting unit does not rotate. Is fuse F2 intact? Replace the fuse. Is there 12 V between pin 1. Adjust or replace S6 of 30 on K1 and earth? the grass collector.
  • Page 23 TROUBLE SHOOTING Applies to RBH 180, and RB 150 1997 models The cutting unit does not stop when the grass collector is full. (“Aut” mode only) Does the cutting unit stop Carry out fault finding on Is microswitch S10 intact? when its height setting is microswitches S10 and set to position T?
  • Page 24 ELECTRICAL SYSTEM Modification of electrical system on RB 150, 1996 model 1. Engine Reason for modification Relay K1 has a self-holding function which breaks 2. Engine stop function power transmission to the cutting unit. The function 3. Carburettor jet is activated when the switch for manual/automatic 4.
  • Page 25 ELECTRICAL SYSTEM Description of modification measures 1. Disconnect the cable connector to relay K1 and K2. 2. Cut off cable 37 (green) just where it connects to terminal #30 on cable connector of relay K2. (Cable 37 is connected to the same terminal as cable 22 [green]).
  • Page 26 ELECTRICAL SYSTEM Description, RB 150 1996 model after modification 1. Engine See wiring circuit, fig. 1. 2. Engine stop function The following pages describe functions that are 3. Carburettor jet integrated with the electrical system of the riding 4. Headlight mower.
  • Page 27 ELECTRICAL SYSTEM Ignition switched off 1. Engine See fig. 2. 2. Engine stop function When ignition is switched off, the stop function 2 of 3. Carburettor jet the engine is earthed via contacts M and G in the 4. Headlight ignition switch S9 and via relay K2.
  • Page 28 ELECTRICAL SYSTEM Ignition switched on 1. Engine See fig. 3. 2. Engine stop function The circuit is made via L and B in the ignition switch 3. Carburettor jet S9 and goes via the following components: 4. Headlight 5. Cutting unit clutch •...
  • Page 29 ELECTRICAL SYSTEM Starter motor activated 1. Engine See fig. 4. 2. Engine stop function Ignition switched on as in the previous description. 3. Carburettor jet The circuit is made via S and B in the ignition switch 4. Headlight S9 and is fed to the operating coil of the starting 5.
  • Page 30 ELECTRICAL SYSTEM Mowing in “Aut“ mode 1. Engine See fig. 5. 2. Engine stop function Ignition is on. Current flows from the battery via the 3. Carburettor jet following components: 4. Headlight 5. Cutting unit clutch • Fuse F2. 6. Battery 12 V, 20 Ah •...
  • Page 31 ELECTRICAL SYSTEM Mowing in “Man“ mode 1. Engine See fig. 6. 2. Engine stop function Ignition is on. Current flows from the battery via the 3. Carburettor jet following components: 4. Headlight 5. Cutting unit clutch • Fuse F2. 6. Battery 12 V, 20 Ah •...
  • Page 32 ELECTRICAL SYSTEM Engine stops when vacating the seat 1. Engine See fig. 7. 2. Engine stop function The microswitch S7 underneath the operator‘s seat 3. Carburettor jet breaks supply to the operating coil of relay K2. The 4. Headlight relay falls and the stop function 2 of the engine is 5.
  • Page 33 ELECTRICAL SYSTEM Headlights 1. Engine See fig. 8. 2. Engine stop function Current is supplied from the ignition switch S9 via 3. Carburettor jet fuse F1 to the lights switch S3. The lights switch 4. Headlight makes the circuit to the headlights 4, which are 5.
  • Page 34 ELECTRICAL SYSTEM Description, RBH 180, and RB 150 1997 models 1. Engine See wiring circuit, fig. 1. The following description deals with the functions 2. Engine stop function 3. Carburettor jet that are integrated with the electrical system of the riding mower.
  • Page 35 ELECTRICAL SYSTEM Ignition switched off 1. Engine See fig. 2. 2. Engine stop function When ignition is switched off, the stop function 2 of 3. Carburettor jet the engine is earthed via contacts M and G in the 4. Headlight ignition switch S9 and via relay K2.
  • Page 36 ELECTRICAL SYSTEM Ignition switched on 1. Engine See fig. 3. 2. Engine stop function The circuit is made via L and B in the ignition switch 3. Carburettor jet S9 and goes via the following components: 4. Headlight 5. Cutting unit clutch •...
  • Page 37 ELECTRICAL SYSTEM Starter motor activated 1. Engine See fig. 4. 2. Engine stop function Ignition switched on as in the previous description. 3. Carburettor jet The circuit is made via S and B in the ignition switch 4. Headlight S9 and is fed via S4 to the operating coil of the 5.
  • Page 38 ELECTRICAL SYSTEM Mowing in “Aut“ and “Man“ modes 1. Engine See fig. 5. 2. Engine stop function Ignition is on as in the description above. Current 3. Carburettor jet flows from the battery via the following components: 4. Headlight 5. Cutting unit clutch •...
  • Page 39 ELECTRICAL SYSTEM In the “Aut“ mode, the cutting unit stops when 1. Engine the grass collector is full 2. Engine stop function See fig. 6. 3. Carburettor jet S5 makes when static pressure in the grass 4. Headlight discharge chute has risen to the preset value (ie, the 5.
  • Page 40 ELECTRICAL SYSTEM The engine stops when vacating the seat 1. Engine See fig. 7. 2. Engine stop function Microswitch S7 underneath the seat breaks the 3. Carburettor jet circuit to the operating coil of relay K2. The relay 4. Headlight releases and the stop function 2 of the engine 5.
  • Page 41 ELECTRICAL SYSTEM Headlights 1. Engine See fig. 8. 2. Engine stop function Power is supplied from the ignition switch S9 via 3. Carburettor jet fuse F1 to the lights switch S3. The lights switch 4. Headlight makes the circuit to the headlights 4 which are 5.
  • Page 42 ELECTRICAL SYSTEM Charging the battery WARNING ANTIDOTE, EXTERNAL: Rinse liberally Take care when handling the electrolyte. with water. It is hazardous, acidic and noxious. Always wear protective goggles and ANTIDOTE, INTERNAL: Drink large protect your skin when handling the acid quantities of water or milk.
  • Page 43 ELECTRICAL SYSTEM Changing fuses On the RB 150, 1996 models, the fuses are located to the right underneath the tank in separate fuse holders. On the RB 150, 1997 models, and RBH 180, the fuses are located on the tank. •...
  • Page 44 ELECTRICAL SYSTEM Symbols Mower system ON Manual switch-off of cutting unit Mower system OFF Automatic switch-off of cutting unit Engine OFF Headlights OFF STOP Starter motor energized Headlights ON Engine started Microswitch under operator‘s seat activated Resetting of cutting unit Microswitch under operator‘s seat deactivated Changing the controls on the instrument panel...
  • Page 45 ELECTRICAL SYSTEM A. ON/OFF switch for mower system Trouble shooting the ON/OFF switch for mower system The pins that are to make contact with each other in the respective modes are marked with a cross (X). Measure the resistance between the pins with an ohmmeter.
  • Page 46 ELECTRICAL SYSTEM B. Ignition switch Trouble shooting the ignition switch The pins that are to make contact with each other in the respective modes are marked with a cross (X). Measure the resistance between the pins with an ohmmeter. The resistance may not exceed 0.5 . Resistance between the other pins is to be more than 1000 .
  • Page 47 ELECTRICAL SYSTEM C. Reset switch The reset switch is located on the instrument panel. Trouble shooting the reset switch Measure the resistance between the two pins with an ohmmeter. The resistance may not exceed 0.5 when the reset switch is pressed in. The reset switch must be replaced if the resistance is infinite.
  • Page 48 ELECTRICAL SYSTEM D. MAN / AUTO switch The switch for the MAN / AUTO mode is located on the instrument panel. Trouble shooting the MAN / AUTO switch The pins that are to make contact with each other in the respective modes are marked with a cross (X). Measure the resistance between the pins with an ohmmeter.
  • Page 49 ELECTRICAL SYSTEM E. Headlights switch The headlights switch is located on the instrument panel. Trouble shooting the headlights switch Measure the resistance between the two pins with an ohmmeter. The resistance may not exceed 0.5 when the headlights switch is in the ON mode. The headlights switch must be replaced if the resistance is more than 1000 .
  • Page 50 ELECTRICAL SYSTEM Microswitch underneath the clutch pedal The microswitch is located underneath the tank to the left of the steering column. Trouble shooting the microswitch for the clutch pedal The pins that are to make contact with each other in the respective modes are marked with a cross (X).
  • Page 51 ELECTRICAL SYSTEM Microswitch underneath the operator‘s seat Trouble shooting the microswitch underneath the operator‘s seat Measure the resistance between the pins with an ohmmeter. The resistance between the pins may not exceed 0.5 when the microswitch is activated. The microswitch must be replaced if the resistance is more than 1000 .
  • Page 52 ELECTRICAL SYSTEM Microswitch for the grass collector The microswitch is located on the rear plate. Trouble shooting the microswitch for the grass collector The pins that are to make contact with each other in the respective modes are marked with a cross (X). Measure the resistance between the pins with an ohmmeter.
  • Page 53 ELECTRICAL SYSTEM Relays K1 and K2 Relay K1 is fitted above K2 underneath the fuel tank. Trouble shooting relays K1 and K2 The pins that are to make contact with each other in the respective modes are marked with a cross (X). Measure the resistance between the pins with an ohmmeter.
  • Page 54 ELECTRICAL SYSTEM Starting relay K3 The starting relay K3 is located underneath the battery basket. Trouble shooting starting relay K3 The pins that are to make contact with each other in the respective modes are marked with a cross (X). Measure the resistance between the pins with an ohmmeter.
  • Page 55 ELECTRICAL SYSTEM Microswitch in grass discharge Activated chute When static pressure in the grass discharge chute exceeds a certain value, (grass discharge chute is Deactivated full) the flap (6) opens. The flap actuates a microswitch which breaks the power supply to the electric clutch and the cutting unit stops.
  • Page 56 ELECTRICAL SYSTEM Microswitch for transport mode Applies to RBH 180, and RB 150 1997 models The microswitches for T-mode are located behind the rear plate. (T-mode = Transport mode) Function • Microswitch 1 breaks the circuit to the electric clutch, which switches off the cutting unit. This occurs when the vertical control of the cutting unit is put in the T-mode.
  • Page 57 ENGINE Dismantling and assembling the engine The figures in this chapter refer to RB 150. The corresponding locations apply also for RBH 180. Changing the sparking plug 0,7 mm CAUTION The engine must cool down before removing the sparking plug. There is otherwise a risk of damaging the threads.
  • Page 58 ENGINE Removing the engine hood 1. Move the hood forward to its limit. 2. Move it back 20°. 3. Lift the hood from its position. Disconnecting the fuel hose from the carburettor 1. Close the flow of fuel by turning the fuel cock (8) at right angles to the fuel hose.
  • Page 59 ENGINE Removing the choke wire (RBH 180) 1. Pull out the choke on the instrument panel. 2. Loosen the screw (14) and lift the wire sheath (16) out of the mounting clamp (15). ’3. Pull the wire outwards and release the wire from the lever (13).
  • Page 60 ENGINE Removing the electromagnetic clutch See chapter “POWER TRANSMISSION“, Changing the electromagnetic clutch. Removing the transmission drive belt See chapter “POWER TRANSMISSION“, Changing the transmission drive belt. Removing the engine belt pulley See chapter “POWER TRANSMISSION“, Changing the engine belt pulley. Removing the engine from the machine CAUTION Ensure that all relevant cables and other...
  • Page 61 ENGINE Fitting the silencer (RBH 180) 1. Fit the silencer with the two gaskets (24) and the four screws (25). VANGUARD 2. Mount the plate behind the engine hood mount 18HP and the engine hood mount (27) with the two V-TWIN screws (26).
  • Page 62 ENGINE Fitting the fuel hose 1. Remove the protective tape from the carburettor fuel port and the end of the fuel hose. 2. Push the fuel hose (9) on the fuel port of the carburettor. 3. To open the flow of fuel, set the fuel cock (8) parallel with the fuel hose.
  • Page 63 ENGINE Connecting cables to the engine 1. Connect the earthing cable (3) to the engine. 2. Connect the cables (4) to the solenoid valve. 3. Fit the guard plate (2), and connect earth (1) to the headlights. 4. Connect cables to the headlights. Fitting the engine belt pulley See chapter “POWER TRANSMISSION“, Changing the engine belt pulley.
  • Page 64 POWER TRANSMISSION Changing the drive belt of the cutting unit Dismantling 1. Hook off the tension spring (1) that is connected to the bracket (2) of the idler pulley. 2. Remove the drive belt from the cutting unit and the electric clutch. Mounting 1.
  • Page 65 POWER TRANSMISSION Changing the engine belt pulley Dismantling 1. Remove the drive belt of the cutting unit. (See page 62) 2. Remove the electric clutch. (See page 62) CAUTION When removing the transmission drive belt, the engine belt pulley can fall off. 3.
  • Page 66 POWER TRANSMISSION Mechanical gearbox for RB The rear plate Dismantling 1. Remove the six screws (1). CAUTION When removing the rear plate, make certain that cables to the microswitch (3) are disconnected before lifting away the plate. 2. Remove the eight screws (2). 3.
  • Page 67 POWER TRANSMISSION 5. Remove the clutch lever (2) from the disc assembly over the rear axle gear. (See below) A. Hold the screw (3) with a screwdriver. B. Remove the nuts (4) and (5). CAUTION Ensure that the lever (2) of the clutch, ball holder surface (6) and balls (7), are protected against dirt.
  • Page 68 POWER TRANSMISSION Changing the gear control Dismantling 1. Remove the elbow joint (1) from the gear control. 2. Remove the gear lever (6) by taking the retainer ring (8) off the pin (9). CAUTION When removing the retainer ring (2), the parts will be ejected from the axle by the compressed spring.
  • Page 69 POWER TRANSMISSION Changing the upper and lower gear rod and elbow joints Removing the upper gear rod 1. Loosen the nuts (2) a couple of turns. 2. Remove the elbow joints (1) and (4) together with the gear rod (3). 3.
  • Page 70 POWER TRANSMISSION Changing the friction plate Inspection Check wear on the friction plate at regular intervals. 1. Remove the rear plate. (See page 64) 2. Check the size between the top of the belt pulley and the top of the friction plate. 3.
  • Page 71 POWER TRANSMISSION 3. Apply the relief tool. (See below) A. Use a multigrip to hold the screw (3) and screw the relief tool onto the screw (3). B. Screw the upper handle anticlockwise while holding the lower handle still. C. When the three lugs have pressed down the clutch spring (10) and the retainer ring (8) can be rotated freely, the retainer ring is to be removed.
  • Page 72 POWER TRANSMISSION 3. Apply the relief tool. A. Use a multigrip to hold the screw (3) and mount the relief tool on the screw (3). B. Screw the upper handle clockwise while holding the lower handle still. C. When the three lugs have pressed down the clutch spring (10) sufficiently, so that the chamfered keyway for the retainer ring is accessible, the retainer ring (8) is to be fitted.
  • Page 73 POWER TRANSMISSION Adjusting the clutch 1. Inspect the clearance of the clutch pedal. The clearance is to be about 1 cm. 2. To adjust the clearance, loosen the locknut (4) and adjusting nut (5) on the screw (3). 3. Hold the screw (3) with a screwdriver while turning the adjusting nut (5) to give the correct clearance.
  • Page 74 POWER TRANSMISSION Hydrostatic gearbox, applies to RBH 180 Rear plate Dismantling 1. Remove the six screws (1). CAUTION When removing the rear plate, make certain that cables to the microswitch (3) are disconnected before lifting off the plate. 2. Remove the eight screws (2). 3.
  • Page 75 POWER TRANSMISSION 5. Remove the rear plate. (See page 72) 6. Remove the three screws (2) and washers, and take off the cooler fan (3). 7. Remove the transmission drive belt from the belt pulley. Mounting 1. Fit the transmission drive belt on the belt pulleys.
  • Page 76 POWER TRANSMISSION Changing the upper link and elbow joints Dismantling 1. Remove the rear plate. (See page 72) 2. Loosen the locknuts (3) half a turn. 3. Remove the elbow joint (5) from the pedal link (6), and elbow joint (2) from the upper lever (1). 4.
  • Page 77 POWER TRANSMISSION Changing the lower link and elbow joint Dismantling 1. Remove the rear plate. (See page 72) 2. Remove the split-pin (1) and washer, and remove the lower link (2). 3. Remove the elbow joint (4) from the lower lever (5), and remove the lower link (2).
  • Page 78 POWER TRANSMISSION Changing the link axle, and upper and lower levers Dismantling 1. Remove the rear plate. (See page 72) 2. Block up the tractor. (See page 3) 3. Remove the retainer ring and washer, and take off the rear right wheel. 4.
  • Page 79 POWER TRANSMISSION Changing the pedal link Dismantling 1. Remove the rear plate. (See page 72) 2. Remove the pedals (1) and (2). 3. Remove the damper (6) from the pedal link. 4. Remove the elbow joint (3) of the upper link from the pedal link (5).
  • Page 80 POWER TRANSMISSION Changing the upper and lower spring holder Dismantling 1. Remove the rear plate. (See page 72) 2. Remove the spring (4). 3. Remove the retainer ring (1) and take the lower spring holder (3) and the upper spring holder (5) off the axle (2).
  • Page 81 POWER TRANSMISSION Checking movement of the upper spring holder 1. Press the forward pedal (7) to the bottom and measure size Y. A. Reduce length h of the setting screw (8) if the size Y <130 mm. B. Increase length h of the setting screw (8) if the size Y >130 mm.
  • Page 82 STEERING SYSTEM Description 11 12 1. Left steering spindle 2. Left tie rod elbow 3. Right steering spindle 4. Tie rod 5. Right tie rod elbow 6. Front steering rod elbow 7. Steering connecting rod 8. Rear steering rod elbow 9.
  • Page 83 STEERING SYSTEM 2. Remove the front wheel by taking off the plastic cap (18), the outer retainer ring (17) and washer. 3. Remove the tie rod elbow (2). 4. For left steering spindle, remove the steering rod belbow (6). 5. For left steering spindle, remove steering column lever (14) and key (13) of the steering connecting rod.
  • Page 84 STEERING SYSTEM Changing the steering gear sector Dismantling 1. Remove the steering rod elbow (8) from the steering gear sector (9). 2. Remove the locknut (19) and washer to remove the lubricating nipple (23) and the bearing (20) of the steering gear sector. 3.
  • Page 85 STEERING SYSTEM Changing the steering column and its parts Dismantling WARNING The riding mower may never be lifted more than 50 cm from a level position unless the following precautions are taken: Drain fuel from the engine and run the engine until the carburettor is dry. Remove the battery.
  • Page 86 STEERING SYSTEM Changing the steering connecting 28 8 rod and steering rod elbows Dismantling 1. Unscrew the nuts (28) half a turn. 2. Remove the steering rod elbow (8) from the steering gear sector. 3. Remove the steering connecting rod (7) from the steering rod elbows.
  • Page 87 STEERING SYSTEM Changing the tie rod and the tie rod elbows 5 29 29 2 Dismantling 1. Unscrew the nuts (29) half a turn. 2. Remove the tie rod elbow (5). 3. Remove the tie rod (4) from the tie rod elbows. Mounting 1.
  • Page 88 BRAKES Applies to RB 150, 1996 and 1997 models Dismantling the brake pedal axle 1. Remove the cutting unit. (See page 92) 2. Remove the spring (2) and take off the parking brake lever (5) and screw (3). 3. Remove the brake pedal (7). A.
  • Page 89 BRAKES Rough adjustment 16 17 18 1. Set the brake lever (16) so that it is at right angles to the brake rod (12). 2. Screw on the nut (19) so that the cup spring (17) just lies lightly against the brake lever and lock the nut (19) with nut (20).
  • Page 90 BRAKES Applies to RBH 180 Dismantling the brake pedal axle 1. Remove the cutting unit. (See page 92) 2. Remove the spring (6) and take off the parking brake lever (3) and screw (5). 3. Remove the brake pedal (1). A.
  • Page 91 BRAKES Rough adjustment 16 17 18 1. Set the brake lever (16) so that it is at right angles to the brake rod (13). 2. Screw on the nut (19) so that the cup spring (17) just lies lightly against the brake lever and lock the nut (19) with nut (20).
  • Page 92 CUTTING UNIT Changing the lifting/lowering wire Dismantling 1. Remove the six screws (1). CAUTION When removing the rear plate, make certain that cables to the microswitch (3) are disconnected before lifting away the plate. 2. Remove the eight screws (2). 3.
  • Page 93 CUTTING UNIT Changing parts of the lifting/ lowering control Dismantling 1. Remove the six screws (1). CAUTION When removing the rear plate, make certain that cables to the microswitch (3) are disconnected before lifting away the plate. 2. Remove the eight screws (2). 3.
  • Page 94 CUTTING UNIT Removing the cutting unit from the machine Dismantling 1. Lower the cutting unit to its lowest cutting position. 2. Loosen the nut (2) to relieve the spring (1). 3. Remove the split-pins (4) and (7). 4. Remove the split-pins (5) and (6) and take the plate off the cutting unit.
  • Page 95 CUTTING UNIT Dismantling the cutting unit Removing the belt pulley 1. Remove the locknut (10) and washer from the cutting blade axle. 2. Take the belt pulley (11) off the cutting blade axle. CAUTION Fit the washer and locknut (10) back on to prevent the cutting blade axle from falling to the floor when removing the gear-toothed belt.
  • Page 96 CUTTING UNIT CAUTION The cutting blade axle can fall down when the locknut (18) is removed. 5. Remove the locknut (18) and washer from the cutting blade axle (20). 55 mm 6. Remove the gearwheel (D) by first tapping down the blade axle with a soft mallet so that the axle is flush with the top of the gearwheel.
  • Page 97 CUTTING UNIT Changing the ball bearings in the bearing holder Dismantling 1. Remove the five screws (28) and unscrew the two screws (27) a couple of turns. 2. Fall the plate backwards to disclose the two bearing holders. 3. Remove the three screws (26) to remove the bearing holders.
  • Page 98 CUTTING UNIT Mounting the cutting unit Fitting the gearwheel (C) 1. Lift the cutting blade axle (25) up through the hole, and place the 25 mm long feather key in its 25 mm chamfered keyway. 2. Align the gearwheel (C) so that the feather key fits in its chamfered keyway inside the gearwheel.
  • Page 99 CUTTING UNIT 3. Lift the cutting blade axle (20) up through the bearing holder, and place the gear-toothed belt (19) round the gearwheel (D). 4. Place the 55 mm long feather key in its chamfered keyway in the cutting blade axle. 55 mm CAUTION The cutting blades are to be fitted at right...
  • Page 100 CUTTING UNIT Adjusting the gear-toothed belt 5310057-01 To adjust tension of the gear-toothed belt, use the tensioning tool and a torque wrench set at 30–35 Nm. A. Tensioning tool. 5310057-01 B. Torque wrench. 1. Unscrew the screws (16) and (17) underneath the plate.
  • Page 101 CUTTING UNIT Fitting the belt pulley The plastic cover is to be put on the cutting unit before fitting the belt pulley and the idler pulley. 150-160 1. Align the belt pulley (11) on the cutting blade axle so that the feather key fits into its chamfered keyway in the pulley.
  • Page 102 CUTTING UNIT Mounting the cutting unit on the riding mower Mounting 1. Push the cutting unit underneath the machine. 2. Make certain that the level control for the cutting unit is set at its lowest position. 3. Fit the front plate securely to the cutting unit with the split-pins (5) and (6).
  • Page 103 CUTTING UNIT 8. Place the drive belt (11) on the belt pulley (30) of the electric clutch. 9. Fit the drive belt (11) on the belt pulley (12) of the cutting unit. 10. Fit the drive belt (11) on the idler pulley, and fit the tensioning spring (9) on the spring bracket (10).
  • Page 104 CUTTING UNIT Changing the shear pins (RB 150, 1997 model, and RBH 180) Dismantling 1. Remove the screw (1), the cup spring (2) and spacer (3). 2. Replace defective shear pins with new ones. (Only genuine spares are to be used) Mounting 1.

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