Valve Repair 2000 SRM 1025
COUNTERBALANCE VALVE
W20/30ZR
Remove
1. Move the lift truck to a safe and level area.
2. Lower the forks completely and extend the forks
completely. Tilt the forks down until they contact
the floor.
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 pin
ch points on the reach carriage
that can caus
e an injury. Use clamps and
blocks to st
op the scissor arms from moving.
7. Install cla
mps and blocks (on both sides) be-
tween the lo
ad bearings and the bottom of the
rear frame o
f the reach assembly to keep the
forks from r
etracting. 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 both hydraulic hose fittings on the bottom
of the valve block to relieve pressure from the tilt
circuit. See Figure 9.
9. 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.
1. REAR FRAME OF THE REACH ASSEMBLY
2. LOAD BEARING
3. WOOD BLOCK
4. CLAMP
Figure 8. Typical Blocks and Clamps
Installation
3. Lubricate the valve cartridge threads and
O-rings with clean hydraulic oil.
4. Installthevalvecartridgeandtorqueto47N•m
(35 lbf ft).
5. Tighten the hydraulic hose fittings.
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 hydraulic oil level in reservoir and fill to
proper level. See Table 1.
10. Test lift truck by lifting and lowering a load sev-
eral times. Check for leaks.
11. Install the drive unit compartment cover.
16
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