Hyster W20-30ZR, Manual

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2000 SRM 1025 Valve Repair
Remove
1. Move the lift truck to a safe and level area.
2. Lower the forks completely and extend the forks
completely.
3. Turn key switch to OFF position and disconnect
battery.
4. Block load wheels to prevent lift truck from mov-
ing. Refer to Periodic Maintenance 8000 SRM
1027.
5. Remove drive unit compartment cover.
6. Discharge the capacitor. See Special Precau-
tions.
WARNING
There are pinch points on the reach carriage
that can cause an injury.
Use clamps and
blocks to stop the scissor arms from moving.
7. Install clamps and blocks (on both sides) be-
tween the load bearings and the bottom of the
rear frame of the reach assembly to keep the
forks from retracting. See Figure 8.
WARNING
Hydraulic oil hoses and lines may be under
high pressure. Hydraulic oil can be injected
into the body by pressure. To prevent possible
injury, shield yourself from any escaping oil.
Wrap a rag around the fitting and loosen the
fitting and loosen the connection slowly.
8. Loosen one hydraulic hose fitting on the lower
side of the valve block to relieve pressure. See
(Figure 11, Item 1).
9. Remove the check valve cartridge.
Install
1. Verify that the valve cartridge O-rings are not
damaged. Replace as needed.
2. Verify that the valve cartridge and valve block
are clean and not damaged.
3. Lubricate the check valve cartridge threads and
O-rings with clean hydraulic oil.
1. HYDRAULIC HOSE FITTING
2. VALVE BLOCK
3. CHECK VALVE
Figure 11. Pilot Operated Check Valve and
Valve Block
4. Install the valve cartridge and torque to 27 N•m
(20 lbf ft).
5. Tighten the hydraulic hose fitting.
6. Remove the clamps and blocks.
7. Connect battery and turn key switch to ON posi-
tion.
8. Operate each hydraulic function several times to
purge the air from the hydraulic circuit.
9. Check the top of the lift cylinder to determine if
a buttonhead bleed screw is present. If a bleed
screw is present, bleed the air from the hydraulic
system. See Bleed Hydraulic System.
10. Check hydraulic oil level in reservoir and fill to
proper level. See Table 1.
11. Test lift truck by lifting and lowering a load sev-
eral times. Check for leaks.
12. Install the drive unit compartment cover.
SELECTOR VALVES: REACH, TILT, AND
SIDESHIFT
W20/30ZR and W25/30/40ZC
Remove
1. Move the lift truck to a safe and level area.
2. Lower the forks completely and extend the forks
completely.
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