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7. Hydraulic system
7.1 General description
The hydraulic system consists of pump, control valve, lift cylinder, tilt cylinder and
hydraulic pipes.
The hydraulic oil, supplied by the oil pump connecting with the motor, is distributed to
the oil cylinders by the control valve.
Item
Type
Model
Main pump
Displacement
Drive
Type
Control valve
Model
Adjusting pressure
Type
Inner diameter of cylinder
Lift cylinder
Outer diameter of piston rod
Stroke
Type
Inner diameter of cylinder
Tilt cylinder
Outer diameter of piston rod
Stroke
Oil tank
Capacity
7.1.1 Oil pump
Oil pump is gear pump, the type is SG05A20L224C (Chinese brand).
The lift oil pump is driven by lift motor. The oil from pump is distributed into two classes
through priority valves. One is for steering unit and another is for control valve.
7.1.2 Control valve
The control valve is of two-spool, four-body type. Controlled by the control valve lever,
the hydraulic oil from oil pump distributes the high pressure oil to lift cylinder or tilt cylinder.
There are safety valve and self-lock valve in the control valve. Setting on the upper side of
control valve inlet, the safety valve can control the system pressure. Setting in the tilting
valve, the self-lock valve is used to prevent the serious result's happening because of
miss-operating when the tilt cylinder has no pressure source. There is check valve
separately between the inlet port and lift valve inlet, between lift valve inlet and tilt valve
inlet. See Fig7-1.
Model
CPDS15
14.5 MPa
Single action piston type with cut off valve
1495 mm (lift height is 3000mm)
56
CPDS18
Gear type
SG05A20L224C
20 ml/rev
Connect with motor
Plunger piston
MSV04
Φ45 mm
Φ36 mm
Dual action piston
Φ63mm
Φ36mm
85mm
24L
16 MPa
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