Vehicle
Systems
Testing
and
Adjusting
51
Hydraulic System
Relief Valve Pressure Check
Use the pressure Gauge kit to check the relief valve
pressure.
WARNING
Hydraulic oil, under pressure can remain in the
hydraulic system after the engine and pump
have been stopped. Personal injury can be
caused if this pressure is not released before
any work is done on the hydraulic system. To
prevent possible injury, lower the carriage to the
ground, turn the key switch off and move the
control levers to make sure all hydraulic
pressure is released before any fitting, plug,
hose or component is loosened, tightened,
removed or adjusted. Always move the lift truck
to a clean and level location away from the travel
of other machines. Be sure that other personnel
are not near the machine when the engine is
running and tests or adjustments are made.
Relief pressure gage point (1)
Remove the plug from elbow (1). Install pressure-checking adapter (4) and, connect pressure-tube (5) and
pressure gage (6). Pressure gage (6) has a range of 2,8000kpa (4,000psi)
Model Mast
RELIFE PRESSURE
Main relief pressure-lift
Auxiliary Relief
Valve
Pressure
Psi Kpa
psi
Kpa
D15S, G(C)15S-5
STD/FF/FFT
2,550±35
17,600±250
2,040
±50
14,000
±350
D18S, G(C)18S-5
STD/FF/FFT
2,880±35
19,860±250
D20S, G20SC-5
STD/FF/FFT
3,125±35
21,550±250
