Hyster W20-30ZR, Manual

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2000 SRM 1025 Lift Pump and Motor Repair
DISASSEMBLE
Remove Reservoir
For the following procedures, refer to Figure 5 for
W30/40ZA lift trucks, Figure 6 for W20/30ZR lift
trucks, and Figure 7 for W25/30/40ZC lift trucks.
1. Use the following procedure that applies to your
lift truck:
a. Remove the screw from the clamp and re-
move the clamp from the reservoir and adap-
tor.
b. Remove the four capscrews from the clamps
and remove the clamps from the reservoir
and the adaptor.
2. Lift the hydraulic pump and motor assembly
from the reservoir.
3. Place pump and motor assembly on a clean drip
pan in a horizontal position.
4. Remove and inspect the O-ring seal located
between the hydraulic pump assembly and the
reservoir. Verify that the O-ring seal is not dam-
aged. Replace as needed.
5. Inspect the inlet strainer. If necessary, remove
the retaining clip to access the screen. Replace
parts that cannot be cleaned or are damaged.
CAUTION
Disposal of lubricants and fluids must meet lo-
cal environmental regulations.
6. Pour oil from reservoir into a container suitable
for disposal.
CAUTION
If oil is contaminated or excessively dirty, the
entire hydraulic system should be thoroughly
cleaned.
7. Examine the hydraulic reservoir. Inspect hy-
draulic reservoir for dirt, foreign materials, or
contamination. Clean and flush the hydraulic
reservoir as necessary.
Remove Pump Motor
1. If the lift pump and motor assembly has not been
previously removed, perform steps 1 through 6 in
Remove Lift Pump and Motor Assembly.
2. Tag and disconnect the power wires from the lift
pump motor.
3. Remove the two nuts and washers attaching the
lift pump mounting bracket to the rubber vibra-
tion isolators.
4. Tilt the lift pump and motor assembly forward,
away from the frame to gain access to the two
capscrews on the top of the lift pump motor.
5. Remove two capscrews from top of motor.
6. Lift the motor from the pump assembly.
7. Inspect the motor output shaft, the pump input
shaft, and the coupling. Replace worn or dam-
aged parts.
Disassemble Pump
For the following procedures, refer to Figure 5 for
W30/40ZA lift trucks, Figure 6 for W20/30ZR lift
trucks, and Figure 7 for W25/30/40ZC lift trucks.
1. Remove the two capscrews and lockwashers that
hold pump mounting bracket to pump and re-
move bracket. See Figure 4.
2. Separate reservoir adaptor plate from pump by
removing attaching hardware (W20/30ZR and
W30/40ZA only).
3. Tag and identify each tube and their correspond-
ing locations.
4. Remove tubes and associated items from bottom
of pump.
5. Use the following procedure that applies to your
lift truck:
a. Remove four screws retaining auxiliary valve
block to pump.
b. Remove four screws retaining valve block to
pump.
c. Remove the two fasteners retaining the main
valve block to the pump.
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