7. HYDRAULIC SYSTEM
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(2) Oil pressure adjustment
①
Remove the plug of the check port (G) located in the inlet section of the control valve, then set there
a 20 MPa {200 kgf/cm
2
} [2901 psi] capacity oil pressure gauge.
②
Operate the tilt lever till the cylinder piston reaches it stroke end. Then measure the hydraulic
pressure at that position.
③
If the pressure is not as specified, loosen the relief valve lock nut and adjust it by turning the
adjustment. If the measured pressure is higher than the specified, once lower it by turning the
adjustment screw counterclockwise till it goes down below the specifi ed level. Then turn the screw
clockwise this time till the specifi ed level is acquired.
④
When adjustment is complete, tighten the lock nut.
Fig. 7.4
INLET SECTION
RELIEF VALVE
LOCK NUT
CAP
Unit: MPa {kgf/cm
2
} [psi]
1 to 1.8 t 2.0 to 3.5 t
Required oil pressure 14.2 {145} [2062] 17.2 {175} [2489]
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