66
66
Fig. 6.4 Setting pressure of the relief valve
Fig. 6.4 Setting pressure of the relief valve
6.4 Hydraulic oil circuit (Fig6.5)
6.4 Hydraulic oil circuit (Fig6.5)
The oil from the hydraulic pump comes to the control valve first and there is divided
The oil from the hydraulic pump comes to the control valve first and there is divided
by the flow divider into
by the flow divider into two parts, one being sent to lift cylinder or
two parts, one being sent to lift cylinder or tilt cylinder, and another
tilt cylinder, and another
to the power steering unit in constant flow rate to operate the steering cylinder. With the
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
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,
returns to the tank through the passage in the control valve. When the lift spool is pulled,
the oil from
the oil from the pump flows through the fl
the pump flows through the flow regulator valve and reaches the lower part of
ow 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
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
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
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
returning to the control valve is regulated by the flow regulator valve and the fork descent
by the flow regulator valve and the fork descent
speed is controlled. When the tilt lever is
speed is controlled. When the tilt lever is operated, the high pressure oil reaches the front
operated, the high pressure oil reaches the front
or rear chamber of the cylinder and pushes the piston forward or backward. The oil
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
pushed out by the piston returns to the oil tank through the control valve and the mast
then tilts forward or backward.
then tilts forward or backward.
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