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HYDRAULIC SYSTEM
Fitting
1. Clean the surfaces mating pumps and motors to their mounts.
2. Bolt the hydraulic pump loosely into place - it must still be possible to move the pump.
3. Bolt the hydraulic motor loosely into place - it must still be possible to move the motor.
4. Using new “O” rings (34), and only hand tightening the fittings at either end, connect the pipe
between pump and motor.
5. Tighten the hydraulic pump bolts.
6. Tighten the hydraulic motor bolts.
7. Tighten the pipe fittings to a torque of 41 Nm (30 ft/lb).
Hydraulic Pump
Removing
1. Drain the hydraulic tank as per the instructions given above.
2. Raise the mower and support on blocks or jack stands.
3. Remove the rear wheel on the side with the faulty pump.
4. Using a swivel-jointed socket handle, hold the idler pulley so that the belt can be rolled off the
pulley beneath the pump (see “Changing belts”).
5. Loosen the two lock screws holding the pump pulley and remove it from its shaft.
6. Clean as set out in the instructions.
7. Remove the hydraulic lines (21, 22 or 23, 24) and “O” rings (34) from both pump and motor.
8. Be careful not to damage the cooler when working on the right hydraulic pump. Release the ball
joint (10) from the pump lever (12) - refer to the “Hydraulic pump linkages” diagram.
9. Disconnect the hose (28) and “O” ring (33) from the pump.
10. Disconnect the hose (26) and “O” ring (33) from the pump.
11. Remove the pump’s retaining bolts and lift it away.
Dismantling and Assembling
Refer to Hydro-Gear Service Manual for Bantam Duty Pump models 10A and 21L.
Fitting
The fitting procedure is the reverse of the removal procedure.
Use new “O” rings.
Pay particular attention to the following:
• Fit hydraulic pipes as per the instructions under “Hydraulic Lines”.
IMPORTANT INFORMATION
Pipes between hydraulic pumps and hydraulic motors must not be subjected to bending or
compression. To avoid pipe fatigue and the resultant leaks and fractures, the fitting
procedures below must be observed.