Autoquip SERIES 35 SCISSORS LIFT - Manual (Page 45)

45
PROBLEM POSSIBLE CAUSE AND SOLUTION
Lift Does Not Raise,
Continued. Breather holes in reservoir fill plug may be clogged. Remove and
clean.
Voltage may be too low to run pump with existing load. Check by
measuring voltage at motor terminals, or as near as possible, while
pump is running under load. Inadequate or incorrect wiring can starve
motor when source voltage is ample. Correct as necessary.
Down valve may be energized by faulty wiring or stuck open. Remove
solenoid and check.
Motor may be single phasing. Check wiring, fuses, etc.
Pump may be seized if motor is humming or blowing fuses on
overload protection devices. Remove pump. Pump can be rotated by
hand unless seized. Check for cracks in housing.
Down solenoid valve stem may be bent, causing valve to stick open.
Replace down solenoid valve.
PROBLEM POSSIBLE CAUSE AND SOLUTION
Lift Won’t Lower. Solenoid coil may be incorrectly wired, burned out, not rated for the
voltage, or line voltage may be excessively low. Check voltage near
coil.
Velocity fuse may be locked. Do not attempt to remove the
velocity fuse. The following steps should be followed:
1. Remove load from lift. Inspect all fittings, hoses, and other
hydraulic components for leaks or damage.
2. If no leak or damage is noticed, attempt to pressurize lifting
cylinder by pressing “UP” button on controller for a few seconds.
Immediately release “UP” button and press “DOWN” button. If lift
starts to lower, continue pressing “DOWN” button until lift is fully
lowered.
3. If lift does not lower after trying Step 2, wait approximately 10 – 15
minutes for pressure in hydraulic system to equalize. Then, press
“DOWN” button until lift is fully lowered.
4. Once lift is fully lowered, hold “DOWN” button for approximately 60
seconds to bleed air from system. This step may need to be
repeated several times to fully remove air in system by raising the lift
to 50% of its travel and lowering.
If above steps do not correct problem, contact Autoquip to obtain
instruction for further action.