12
5 Hydraulic and electric circuit
Hydraulic circuit Electric circuit
6 Operating principle
This product uses a motor-driven hydraulic pump to activate a hydraulic cylinder that raises an M
carriage via a driving chain. A S carriage is connected via a synchronizing chain (driven chain) to the M
carriage so that the two carriages will move up and down together.
● Lift-up
With the control lever set to the lift-up side, the motor turns and the pump feeds hydraulic oil to the
cylinder to raise the carriages via the drive chain.
● Lift-down
With the control lever set to the lift-down side, the lowering valve opens to flow the hydraulic oil in
the cylinder back to the oil tank through the flow stop valve, the lowering valve, and the flow control
valve so that the carriages will move down.
Check valve
Motor
Oil tank
Lowering
valve
Flow control valve
Gear pump
Synchronizing chain
Chain wheel
Drive chain
M carriage
S carriage
Hook control lever
Hook control lever
Hydraulic cylinder
Flow stop valve
Chain adjusting screw
Safety
rod
Catch gear
Supporter
Swing arms
LS for rising
Hydraulic cylinder
Fuse valve
Check valve
Gear pump
Motor
Relief valve
Strainer
Oil tank
Flow control valve
Lowering valve
(Control manual lever)
