Specifications

81
6.7 Hydraulic circulation system (Main circuit)
The hydraulic system sketch sees Fig. 6.10.
The hydraulic circulation system of the main circuit is complicated with the
hydraulic for power steering. The hydraulic piping is of O-ring fitting type with excellent
sealing performance, providing secure oil tightness.
The hydraulic oil sent from the rear main pump flows directly to the control valve,
while the hydraulic oil sent from the front main pump is divided by the flow divider
valve in two portions for steering and load handling operation.
The hydraulic oil for load handling flows into the control valve and mingles with
the hydraulic oil from the rear main pump. With the control valve in neutral position,
the oil returns to the oil tank, passing through the valve.
Fig.6.10 Hydraulic system
Ton
t
5
6
7
Flow of control valve Q
1
L/min
160
160
160
Flow of steering unit Q
2
L/min
25
25
25
Pressure of primary safety valve P
1
MPa
20
20
20
Pressure of steering safety valve P
2
MPa
12.3
12.3
12.3
When the lift lever is pulled, the hydraulic oil from the control valve flows through
the flow regulator valve and reaches the lower part of the lift cylinder piston to push up