Hyster W20-30ZR, Manual

Page: 21 / 48

2000 SRM 1025 Valve Repair
1. VALVE BLOCK
2. HYDRAULIC HOSE FITTING
3. COUNTERBALANCE VALVE
Figure 9. Counter Balance Valve and Valve
Block
W25/30/40ZC
Remove
1. Move lift truck to a safe and level area.
2. Lower forks completely to relieve pressure from
the hydraulic circuit.
3. Position the mast vertical and secure the posi-
tioning with an overhead lifting device to prevent
the mast from tilting forward/backward.
4. Turn key switch to OFF position and disconnect
battery.
5. Block load wheels to prevent lift truck from mov-
ing. Refer to Periodic Maintenance 8000 SRM
1027.
6. Remove the drive unit compartment cover and
the hydraulic unit compartment cover.
7. Discharge the capacitor. See Special Precau-
tions.
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 tilt cylinder hose fitting at the valve
block to relieve any remaining pressure from the
tilt circuit. See (Figure 10, Item 1).
1. HYDRAULIC HOSE FITTING
2. VALVE BLOCK
3. COUNTERBALANCE VALVE
Figure 10. Counterbalance Valve and Valve
Block
9. Tighten the hydraulic hose fitting.
10. Slowly loosen and remove the valve cartridge.
Install
1. Verify that the O-rings on the valve cartridge are
not damaged. Replace as needed.
2. Verify that the valve cartridge and valve block
are clean and not damaged.
3. Lubricate the valve cartridge threads and
O-rings with clean hydraulic oil.
4. Install the valve cartridge and torque to 47 N•m
(35 lbf ft).
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