1600 SRM 974
Axle Assembly Repair
1.
HOSE
2.
STEER MOTOR
3.
CAPSCREW
4.
LOCKWASHER
5.
GEAR
6.
FLAT WASHER
7.
LOCKWASHER
8.
CAPSCREW
Figure 11. Hydraulic Steering Motor,
Gear-Steered
The hydraulic steering motor uses a rotor assembly
to change hydraulic energy into mechanical energy.
The rotor assembly has a fixed rotor with seven vanes
and a stator. There is hydraulic pressure between
the vanes and stator. The pressure makes the stator
rotate in the rotor.
A drive link in the motor housing has two purposes:
1.
To rotate the output shaft
2.
To rotate the commutator
The commutator is a valve that controls the flow of
oil to and from the motor assembly.
This control
of oil flow permits the valve to control the amount
of hydraulic energy. The need for hydraulic energy
changes as the need for mechanical energy changes.
The mechanical energy needed at the output shaft
changes with the steering conditions.
Remove
WARNING
Make sure the brake pedal is released and
the brake is applied. Put blocks on both sides
(front and back) of the drive/steer tire and
the caster wheels to prevent movement of the
lift truck. Put a block on each side (front and
back) of the load wheels to prevent movement
of the lift truck. See the Operating Manual or
Periodic Maintenance 8000 SRM 970.
1.
If the truck has a steering chain, use the steering
system to move the master drive unit for access
to the chain anchor of the steering chain.
2.
Disconnect the battery.
Open the drive unit
compartment cover. Block the drive/steer tires,
caster wheels, and load wheels on both sides
to prevent movement of the lift truck. See the
Operating Manual or Periodic Maintenance
8000 SRM 970.
3.
If the truck has a steering chain, remove the
steering chain from the sprocket of the hydraulic
motor. To remove the chain, first make a mark
on the chain anchor and the MDU housing at the
chain anchor. Remove the cotter pin from the end
of one offset pin at the chain anchor. Remove the
link pin and chain. Remove the chain from the
sprocket of the hydraulic motor. Use wire to fas-
ten the chain so that it does not fall.
4.
Remove the capscrews and lockwashers that re-
tain the hydraulic motor to the articulating axle
weldment. Remove the motor.
5.
Install labels on the hydraulic lines for proper in-
stallation at assembly. Disconnect the hydraulic
lines and install caps on the lines and fittings.
Plug the ports of the motor.
6.
Put the flange of the motor in a soft-jawed vise.
7.
For lift trucks with a chain sprocket, hold the
sprocket and remove the nut and washer. Do not
damage the sprocket teeth.
8.
For lift trucks with a pinion gear, hold the gear
and remove the nut and washer. Do not damage
the gear teeth.
9.
Carefully remove the sprocket or gear and
woodruff key. The woodruff key is located be-
tween the sprocket or gear and shaft. Do not let
the woodruff key fall.
NOTE: Most service personnel do not repair the hy-
draulic motor. The cost of repairs can be greater than
the cost of a replacement motor.
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