Baoli CPDS15 - Hydraulic System; General Description

56
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.
Model
Item
CPDS15
CPDS18
Main pump
Type
Gear type
Model
SG05A20L224C
Displacement
20 ml/rev
Drive
Connect with motor
Control valve
Type
Plunger piston
Model
MSV04
Adjusting pressure
14.5 MPa
16 MPa
Lift cylinder
Type
Single action piston type with cut off valve
Inner diameter of cylinder
Φ45 mm
Outer diameter of piston rod
Φ36 mm
Stroke
1495 mm (lift height is 3000mm)
Tilt cylinder
Type
Dual action piston
Inner diameter of cylinder
Φ63mm
Outer diameter of piston rod
Φ36mm
Stroke
85mm
Oil tank
Capacity
24L
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.