14-14
PRESSURE RELIEF VALVE ADJUSTMENT
Notes:
• Always follow the procedure below for adjustment. Careless adjustment may cause high-
pressure generation, resulting in damage to equipment such as the oil pump.
• There is no adjustment if:
(a) the pressure relief valve is not disassembled
(b) the pressure relief valve is replaced in conformity with the mast supplied with the
vehicle; check the maximum pressure
1 Remove the plug of the pressure measuring point on the priority valve and connect a pressure gauge.
Pressure gauge end stroke: 300 bar or more.
2 Loosen the counter nut on the relief valve adjustment screw and adjust the screw (only for lifting
section).
3 Adjust the oil pressure as follows:
(a) Turn the key switch ON
(b) Lift the mast to the end stroke and check the pressure on the pressure gauge (without load)
(c) Adjust the pressure if necessary bearing in mind that:
screwing in = increasing of pressure
screwing out = decreasing of pressure
(d) Tight the counter nut when the detected pressure reach the correct value according to the
table below
4 Remove the pressure gauge and screw in the plug.
Pressure relief valve
Release screw
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