L401 & L404 OPERATION INSTRUCTIONS 6. Troubleshooting
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6. Troubleshooting
6.1 Troubleshooting Chart
PROBLEM POSSIBLE CAUSE SOLUTION
Circuit breaker or fuse blown in shop
power panel.
Locate shop power panel and
restore power. If overload repeats
due to lift operation, contact factory
service representative.
Lift does not operate.
Hydraulic system malfunction. Contact factory service
representative.
Low hydraulic fluid reservoir. Lower lift, check hydraulic fluid level,
and fill. Determine reason for low
hydraulic fluid level.
Overhead obstruction to vehicle. Lower lift and remove obstruction.
Voltage supply low. Contact factory service
representative.
“Raise” button depressed,
motor runs but lift will not rise
to full height.
Hydraulic system malfunction. Contact factory service
representative.
Vehicle is beyond 14,000 lb. (L401) or
16,000 lb. (L404) capacity.
Do not attempt to raise vehicles in
excess of lift capacities.
“Raise” button depressed,
motor runs, lift does not move.
Electrical/Hydraulic control
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.
One or more lock latches still
engaged on the lock ladder.
Raise lift more before pressing
“Latch Retract” button.
Air control malfunction. Check air supply and hoses.
Indicator broken. Contact factory service
representative.
“Latch Retract” button pressed,
indicator does not change to
green.
Leak in the air circuit. Check air circuit and repair any
leaks. Contact factory service
representative.
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