Autoquip BASCULE BRIDGE - DOUBLE LEAF - Manual (Page 42)

TROUBLESHOOTING ANALYSIS
PROBLEM POSSIBLE CAUSE AND SOLUTION
Bridge will not lower. • The down solenoid may be malfunctioning.
• The structural members may be in a bind.
• The tubing or hose is obstructed or broken. Check
for obstruction in the line.
• The return filter may be clogged.
• The velocity fuse may be locked. Do not attempt to
remove the velocity fuse. The following steps
should be followed:
1. 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”
button on the controller for a few seconds.
Immediately up releasing the “UP” button, depress
the “DOWN” button. If the bridge starts to lower,
continue pressing the “DOWN” button until the bridge
is in the fully lowered position.
3. If the bridge does not lower after trying Step 2,
wait approximately 10 – 15 minutes for the pressure
in the hydraulic system to equalize. Momentarily
press the “UP” button, then, depress the “DOWN”
button until the bridge is in the fully lowered position.
4. Once the bridge 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 bridge 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.
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