Relief Valve Adjust - Yale 524150797 Maintenance Manual

1900 YRM 1506
16. Remove the pressure gauge and tee.
17. Reconnect the hydraulic hose to pump.
18. Connect the battery and turn the key switch to ON
position.
19. Operate the hydraulic functions several times to
purge the air from the hydraulic circuit.
20. Remove blocks from wheels.
21. Test the lift truck by lifting and lowering a load
several times. Visually check for leaks.
CAUTION
DO NOT OVERFILL RESERVOIR. Oil will leak from
the breather/filler cap during operation if reservoir
is over filled.
22. Check the hydraulic oil level in the reservoir. Re-
move breather cap and add recommended hy-
draulic oil to proper level, as required. See the
section Hydraulic Pump Reservoir.
23. Install the drive unit compartment cover.

RELIEF VALVE ADJUST

Refer to the section Relief Valve Pressure Check to
determine if adjustment is necessary.
1. Verify the key switch is in the OFF position and
the battery is disconnected.
2. Remove the hydraulic reservoir. See Hydraulic
Pump Reservoir.
3. Loosen the locking nut on the relief valve. See
Figure 8.
4. Adjust the relief valve screw in small increments.
Turn the adjustment screw clockwise to increase
pressure. Turn the adjustment screw counter-
clockwise to decrease pressure.
5. Tighten the lock
15 N•m (11 lbf ft).
6. Install the hydraulic reservoir as removed.
nut and torque to
7. Connect the battery and turn key to the ON posi-
tion.
8. Recheck the relief pressure. See Relief Valve
Pressure Check.
9. Repeat as necessary, until the correct relief pres-
sure is measured.
10. Perform Step 13 through Step 23 in Relief Valve
Pressure Check to complete procedure.
1. LIFT MOTOR
2. PUMP HOUSING
3. TUBE
4. CLAMP
5. INLET ADAPTER
6. SCREEN
7. SNAP RING
8. ADJUSTMENT SCREW
9. LOCK NUT
10. RELIEF VALVE ASSEMBLY
Figure 8. Relief Valve Adjust
Relief Valve Adjustment
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