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Lift Motor Troubleshooting
MOTOR ISSUE
- The electric motor does not run
CAUSE
- 1. Fuse is burnt or breaker is tripped
- 2. Check for the correct voltage to the motor
- 3. Inspect all wiring connections
- 4. The "up" button is defective
- 5. The AC Contactor is defective
- 6. Overhead limit switch is defective
- 7. Motor windings burned out
REMEDY
- 1. Replace fuse or reset circuit breaker
- 2. Supply correct voltage to the motor
- 3. Repair, replace, insulate and tighten all wires
- 4. Replace the "up" button
- 5. Replace the AC contactor
- 6. Replace the overhead limit switch
- 7. Replace the motor
MOTOR ISSUE
- The electric motor makes a humming sound
CAUSE
- 1. Start capacitor is defective
- 2. The AC Contactor is defective
REMEDY
- 1. Replace the start compacitor
- 2. Replace the AC contactor
MOTOR ISSUE
- The electric motor runs but will not raise the lift
CAUSE
- 1. Plugged oil filter screen
- 2. Cracked or loose oil suction tube
- 3. Lowering valve is stuck open
- 4. Low hydraulic oil level
- 5. Oil pump is not priming
REMEDY
- 1. Clean or replace oil filter screen
- 2. Replace or tighten oil suction tube
- 3. Clean or replace lowering valve
- 4. Fill tank with hydraulic oil. Refer to owner's manual
- 5. Replace oil pump
MOTOR ISSUE
- Electric motor runs and raises unloaded but will not raise with a load
CAUSE
- 1. Debris in the lowering valve
- 2. Motor operating on low voltage
- 3. Pressure adjust valve out of adjustment
- 4. Exceeding the weight limit of the lift
REMEDY
- 1. Clean or replace lowering valve
- 2. Supply correct volage to the motor
- 3. Adjust or replace pressure adjust valves
- 4. Check vehicle weight and/or check for equal vehicle weight distribution
MOTOR ISSUE
- Lift comes down slowly
CAUSE
- 1. External hydraulic oil leak(s)
- 2. Debris in the loweing valve
- 3. Debris in the check valve
REMEDY
- 1. Repair external leaks
- 2. Clean or replace lowering valve
- 3. Clean or replace check valve
MOTOR ISSUE
- Slow lifting speed or hydraulic oil seeping out of the filler/breather cap
CAUSE
- 1. Air mixed with hydraulic oil
- 2. Oil-return tube loose
- 3. Hydraulic system over filled
REMEDY
- 1. Repair external leaks
- 2. Clean or replace lowering valve
- 3. Clean or replace check valve
MOTOR ISSUE
- Power unit is noisy
CAUSE
- 1. Sucking air and oil at the same time (foamy oil causing cavitation)
- 2. Power unit mounting bolts (to the post) are loose
- 3. Worn motor coupling - located between the motor and the pump
- 4. Plugged oil filter screen
REMEDY
- 1. Change old hydraulic oil with fresh hydraulic oil
- 2. Tighten power unit mounting bolts
- 3. Replace motor coupling
- 4. Clean or replace oil filter screen
MOTOR ISSUE
- Lift Stops Short Of A Full Rise
CAUSE
- 1. Low on hydraulic oil
- 2. Oil suction tube is too short or it has a crack in it
REMEDY
- 1. Add oil
- 2. Replace oil suction tube
