Hunter L494 - Troubleshooting

6.Troubleshooting
Table3.Troubleshooting Chart
PROBLEM POSSIBLE CAUSE SOLUTION
Lift does not operate. Circuit breaker or fuse blown in shop
power panel.
Hydraulic system malfunction.
Locate shop power panel and restore power.
If overload repeats due to lift operation,
contact factory service representative.
“RAISE” button depressed,
motor runs but lift will not
rise to full height
Low hydraulic uid reservoir.
Overhead obstruction to vehicle.
Voltage supply low
Hydraulic system malfunction.
Lower lift, check hydraulic uid level, and ll.
Determine reason for low hydraulic uid
level.
Lower lift and remove obstruction.
Contact factory service representative.
“RAISE” button depressed,
motor runs, lift does not
move.
Vehicle is beyond capacity.
Electrical/Hydraulic controls
malfunction.
Electrical control malfunction.
Do not attempt to raise vehicles in excess of
lift capacities. Electrical/Hydraulic controls
malfunction.
Contact factory service representative.
Runways continue to rise
after “Raise” button is
released.
Electrical control malfunction. Turn circuit breaker “Off” at shop power
panel.
Contact factory service representative.
Locks do not retract One or more locks still engaged on the
lock ladder.
Air control malfunction. Leak in air
circuit.
Raise lift more before pressing “LOCKS
RETRACT” switch
Check air supply and hoses. Check air circuit
and repair any leaks.
Contact factory service representative.
“Lower sequence started;
lift raises but then does
not lower.
One or more locks still engaged on the
lock ladder.
Air control malfunction. Velocity fuse
tripped.
Electrical/Hydraulic controls
malfunction.
One or more locks still engaged on the lock
ladder.
Check air supply and hoses.
Contact factory service representative.
Lift continues to descend
after “LOWER” button is
released.
“LOWER” button is stuck or 2- way
valve (“LOWER” solenoid valve) is
stuck open
Contact factory service representative.
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