Hyster W20-30ZR, Manual

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Valve Repair 2000 SRM 1025
11. Operate each hydraulic function several times to
purge the air from the hydraulic circuit.
12. 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.
13. Check hydraulic oil level in reservoir and fill to
proper level. See Table 1.
14. Test the lift truck by lifting and lowering a load
several times. Check for leaks.
15. Install the drive unit compartment cover. If nec-
essary, install the hydraulic unit compartment
cover.
DIRECTIONAL VALVE
Remove
1. Move lift truck to a safe and level area.
2. Lower the forks completely to relieve pressure
from the hydraulic system.
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 the drive unit compartment cover. On
W25/30/40ZC lift trucks, also remove the hy-
draulic compartment cover.
6. 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.
CAUTION
To prevent dirt or contaminants from entering
the hydraulic system, always install caps on
the hoses and ports of the pump.
7. Tag and disconnect any power wires or hydraulic
hoses blocking access to the valve.
8. Tag and identify the control wiring plugs and
valve coils.
9. Remove the locking screws from the control
wiring plugs.
Disconnect the plugs from the
coils.
10. Remove the nut and slide the front coil off the
valve.
11. Remove the spacer and the rear coil.
12. 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 34 N•m
(25 lbf ft).
5. Slide the rear coil onto the valve cartridge with
the lettering out towards the front coil.
6. Slide the spacer and then the front coil onto the
valve cartridge with the lettering out towards the
coil retainer.
7. Install the nut and torque to 7 N•m (60 lbf in).
8. Connect the control wiring plugs to the coils as
noted on the tags.
9. Install the locking screws into the coil plugs.
10. Connect any power wires and hydraulic hoses
previously disconnected.
11. Connect battery and turn key switch to ON posi-
tion.
12. Operate each hydraulic function several times to
purge the air from the hydraulic circuit.
13. 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.
14. Check hydraulic oil level in reservoir and fill to
proper level. See Table 1.
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