Autoquip TRUCK LEVELER - SHALLOW PIT MOUNT - Manual (Page 29)

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Familiarize yourself with this operator’s manual before operating the equipment!!!
The Truck Levelers have a lifting capacity from 40,000 to 60,000 pounds. The safety
relief valve on the power unit has been factory set to open at a pressure slightly above
the rated load capacity and allows the oil to bypass back into the reservoir to prevent
damage to the lift and its hydraulic power unit. Lowering loads exceeding the rated
capacity of the lift may also result in excessive wear and damage to the lift as well as
possible personal injury.
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
could result in permanent damage to the motor or pump.
The Truck Levelers are furnished with constant pressure push button controls.
Actuating the “UP” button causes the contractor to energize, closing the line contacts
and allowing line voltage to be applied to the motor. The motor will drive a fixed
displacement 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 cylinders that lift the platform as the
cylinder rods are forced out.
When the desired height of the platform is attained, releasing pressure from the push
button deactivates the “UP” button. 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 platform, depress the “DOWN” button on the push button control, which will
energize the down valve solenoid. The solenoid pushes out and activates the down
valve, which allows it to open. Once opened, the down valve allows oil in the hydraulic
cylinders to flow through the velocity fuses and the down valve at a controlled rate and
return to the reservoir.
The downward travel of the platform may be stopped at any desire 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