Group 30, Hydraulic Control Valve/Lift Circuit
30-4-2 • Hydraulic System Pressure Checks and Adjustments SM 765, Nov ’06
Main Pressure Relief Adjustment
IMP
RTANT
Main pressure relief setting is set at the fac-
tory. If the relief pressure does not measure
within the setting range, main pressure relief
setting is adjusted.
To adjust the hydraulic system main pressure relief valve:
1. Loosen the jam nut on the main relief valve adjust-
ment screw.
2. Turn the adjustment screw to set the main pressure
relief setting to the normal range.
3. Reset the jam nut on the main relief valve adjustment
screw.
Auxiliary Pressure Relief Adjustment
IMP
RTANT
The auxiliary relief setting only applies to a
hydraulic valve that has auxiliary sections
added.
To adjust the hydraulic system auxiliary pressure relief
valve:
1. Loosen the jam nut on the auxiliary relief valve
adjustment screw.
2. Turn the adjustment screw to set the auxiliary pres-
sure relief setting to the normal range.
3. Reset the jam nut on the auxiliary relief valve adjust-
ment screw.
Pressure
check port
Main
relief valve
Secondary
relief valve
Main
relief valve
Secondary
relief valve
Adjustement screw
Jam nut
Jam nut
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