14-7
14
RELIEF VALVE ADJUSTMENT
• Always follow the procedure below for adjustment. Careless adjustment may cause high-
pressure generation, resulting in damage to hydraulic units such as the service pump
• No adjustment is needed when the relief valve is not disassembled or the mast is replaced
• If the relief valve is replaced, check the maximum pressure according to the mast used
1. Remove the plug of the pressure measuring point on the pump and connect a pressure gauge.
Pressure gauge end stroke: 300 bar or more
2. Loosen the counter nut on the relief valve and adjust the screw (allen screw for lifting, square screw for
tilting, side shift and other lever)
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) Tighten the counter nut when the measured pressure reaches the correct value according to
the mast performance table
4. Repeat point 3 for the other functions too (tilting, side shift, …) once each time
5. Remove the pressure gauge and screw in the plug
Sideshift relief valve
pressure
Tilting relief valve
pressure
Lifting relief valve
pressure
IV way relief valve
pressure
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