Dock Leveler Troubleshooting - Blue Giant BLUE GENIUS SERIES Installation & Owner's Manual

19.
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PROBLEM
Deck will not raise when
touch button is operated.
Motor does not attempt to
run, no sound is heard
from motor / power pack
and control box.
Deck will not raise when
touch button is operated.
Motor attempts to run, but
power supply breaker
switch trips to the off position,
turning the power off before
the motor reaches full running
speed.
Lip does not extend fully. Oil
level in reservoir is not low.
A-SERIES HYDRAULIC DOCK LEVELER WITH BLUE GENIUS™ CONTROLS

DOCK LEVELER TROUBLESHOOTING

Do not attempt to install, make repairs or adjustments. Only a trained and
authorized service technician should perform the installation process.Contact your
local dealer or distributor for assistance.
PROBLEM CAUSE
1. No power supply to control station.
- Breaker tripped.
- Fuse blown.
- (Disconnect) switch open.
2. Thermal overload tripped open.
- Shut off main power from fused disconnect and turn back on.
- If trip-off recurs, check / repair motor circuit as required.
3. Faulty control box component i.e. fuse, touch button, contactor, transformer.
- Repairs by qualified personnel as required.
- Single phase condition on a three phase system.
1. Power supply circuit is overloaded by other equipment or components being used
on a branch circuit controlled by the same breaker switch. The power supply line
circuit must be upgraded to meet the requirements of the power unit.
A temporary corrective measure is to purposely misadjust the pressure relief valve to
allow a minimal bypass of oil at motor startup and cause a reduction of amperage
draw during startup. Turn relief valve adjusting screw counter-clockwise 1/4 turn and test
operate. Repeat as required to a setting that will allow motor to start and deck and lip to raise
and extend fully. Readjust to normal settings after line voltage problem has been corrected.
Failure to readjust to normal setting will result in unnecessary, frequent, service callbacks.
1. Lip plate bent causing hinge to bind.
- Repair and lubricate as required.
2. Foreign material lodged in the lip hinge area.
- Clean thoroughly as required.
3. Relief valve is by-passing.
- In some instances slight mechanical imperfections can be overcome by increasing the
hydraulic pressure.
- Turn relief valve adjusting screw clockwise until it bottoms out and then back off 1/8 turn.
Note: Repair is not completed until mechanical damage is corrected.
23
Relief Valve (7)