Autoquip COIL TRANSFER CARS - Manual (Page 17)

17
Familiarize yourself with this operator’s manual before operating this equipment.
CAUTION!
Do not continue to depress the “UP” button on the controller if the lift is
not raising or if the lift has reached the fully raised position. To do so may
result in permanent damage to the motor or pump.
Scissors lifts are designed primarily for in-plant applications and are furnished with
constant pressure pushbutton and footswitch controls. Actuating the "UP" button
causes the coil on the contactor to energize, closing the line contacts and allowing the
line voltage to be applied to the motor. The motor will drive a gear pump, which in turn
draws oil from the reservoir through the pump and forces it at a constant volume under
pressure required by the load. The oil flows through the valves and piping into the
hydraulic cylinder. The hydraulic cylinder is attached to structural members of the lift
causing the scissor mechanism of the legs to open as the cylinder rod extends.
When the desired height or upward travel of the platform is attained, the "UP" button is
deactivated by releasing pressure from the pushbutton or footswitch. The power unit
will stop pumping oil, and the check valve will close preventing reverse flow of the oil.
This maintains the desired raised position
To lower the lift, the operator simply depresses the "DOWN" button on the pushbutton
control energizing the down valve solenoid. The solenoid activates the valve to open.
Once opened, the down valve allows oil in the hydraulic cylinder to flow through the
velocity fuse, the flow control, and the down valve at a controlled rate and return to the
reservoir. The downward travel of the lift platform may be stopped at a desired
elevation by releasing pressure from the "DOWN” button.
NOTE: The motor does not operate during downward travel.
CAUTION!
Do not operate the power unit on relief for more than a few seconds. When
on relief, the valve will make an audible squealing sound.
OPERATING INSTRUCTIONS