Autoquip PLTC DOCK LIFT - Manual (Page 82)

82
DANGER!
To avoid personal injury, NEVER go under the lift platform until the load is
removed and the scissors mechanism is securely blocked in the open position.
See "Lift Blocking Instructions" section.
PROBLEM POSSIBLE CAUSE AND SOLUTION
Lift does not raise.
• The motor voltage/wiring may be incorrect.
• The hydraulic line or hose may be leaking.
• Oil in the reservoir may be low. Add oil as
necessary (See Oil Requirements in the
“Routine Maintenance” section.)
• The load may exceed the rating. (See the
“Specifications” section.)
• The suction screen may be clogged. Remove
and clean the screen. Drain and replace the oil.
• The suction line may be leaking air due to a
loose fitting. Tighten as needed.
• The breather holes in the reservoir fill cap may
be clogged. Remove and clean.
• The "Down" valve may be energized by faulty
wiring or stuck open. Remove the solenoid and
check.
• The power unit pump may be defective
• The structural members of the lift may be in a
bind.
• The manual lowering device may be engaged.
• AIR POWER UNIT: Air hose connections may
be leaking air or hoses maybe crimped. Check
for air leaks and hose crimping and resolve
these issues.
• There may be insufficient air pressure or air flow
at the air motor. Air requirements at the air
motor are: 90 PSI & 110 CFM). Check the air
supply at the air motor and resolve air supply
issues.
Lift seems bouncy during
operation.
• There may be air in the hydraulic system.
Bleed the air from the cylinder
• Oil in the reservoir may be low. Add oil as
necessary (See the “Routine Maintenance”
section.)
• The power unit suction strainer may be clogged.
• The power unit suction line may be leaking.
• There may be foreign material on the roller
plate.
TROUBLESHOOTING ANALYSIS