Baoli F Series - Hydraulic oil circuit

67
6.4 Hydraulic oil circuit (Fig6.5)
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
Fig6.5 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