Specifications

60
7.4 Hydraulic oil circuit (Fig7.5)
The oil from the hydraulic pump comes to the control valve first and there is
divided by the flow divider into two parts, one being sent to lift cylinder or tilt cylinder,
and another to the power steering unit in constant flow rate to operate the steering
cylinder. With the spools of the lift and tilt spool valves in neutral position, the oil from
the pump directly returns to the tank through the passage in the control valve. When
the lift spool is pulled, the oil from the pump flows through the flow regulator valve and
reaches the lower part of the lift cylinder to push the piston up. When push the lift
spool, the circuit between the lower part of the lift cylinder and the oil tank is
connected and the piston begins to descend due to the weight of the load and all of
lifting parts. In this case, the oil flow returning to the control valve is regulated by the
flow regulator valve and the fork descent speed is controlled. When the tilt lever is
operated, the high pressure oil reaches the front or rear chamber of the cylinder and
pushes the piston forward or backward. The oil pushed out by the piston returns to the
oil tank through the control valve and the mast then tilts forward or backward.
circuit
Fig7.5 Hydraulic oil
Ton
t
2-3
3.5
Flow,control
valve Q1
L/min
65
65
Flow,steering
unit Q2
L/min
13
13
Primary
pressure,
hydraulic
system P1
Mpa
17.5
19
Steering
pressure P2
Mpa
9
10.5