Autoquip DOUBLE PANTOGRAPH LIFT - Manual (Page 69)

69
PROBLEM POSSIBLE CAUSE AND SOLUTION
Lift will not Lower.
• The down solenoid may be malfunctioning.
• The maintenance leg could be installed.
• The structural members may be in a bind.
• The hose or tubing maybe obstructed or broken.
Check for obstruction in the line.
• The return filter may be clogged. (Vertical PU only)
• The velocity fuse may be locked. Do not attempt to
remove the velocity fuse. The following steps
should be followed:
1. Remove the load from the lift. Inspect all fittings,
hoses, and other hydraulic components for leads or
damage.
2. If no leak or damage is noticed, attempt to
pressurize the lifting cylinder by depressing the “UP”
pushbutton (or optional footswitch) for a few seconds.
Immediately release the “UP” button and depress the
“DOWN” button. If the lift starts to lower, continue
pressing the “DOWN” button until the lift is in the fully
lowered position.
3. If the lift does not lower after trying Step 2, wait
approximately 10 – 15 minutes for the pressure in the
hydraulic system to equalize. Then, depress the
“DOWN” pushbutton until the lift is in the fully lowered
position.
4. Once the lift is in the fully lowered position, bleed
the air from the hydraulic system by depressing the
“DOWN” button. Hold the “DOWN” button for
approximately 60 seconds. This step may need to be
repeated several times to fully remove the air in the
system by raising the lift to 50% of its travel and then
lowering it.
• Should the above steps not correct the problem,
contact Autoquip to obtain instruction for further
action.
TROUBLESHOOTING ANALYSIS