33
TROUBLESHOOTING
UniLock vehicle restraint
is operational, but the
hook drops while the
transport vehicle is being
serviced, causing the
lights to change.
Verify brake torque.
If brake torque is less than 42 ft-lbs, or chain is loose
or broken, adjust or replace as required.
Drive motor faulty. Check motor. Repair or replace as needed.
UniLock vehicle restraint
is operational, but all
lights are out.
Faulty LED lights. Check and replace LED lights as needed.
Faulty asher. Check asher; if bad replace.
UniLock vehicle restraint
lights not working in
correct order.
Incorrect wiring. Verify all eld wiring connections are
correct.
Inside red light does not
change.
Defective LS1.
Outside lights and inside
green light do not change.
Defective LS2.
UniLock vehicle restraint
carriage does not return
to full up position.
Broken or weak springs. Replace all springs.
Damaged roller track plate. Verify that the roller track plate is straight and not
binding or catching.
Carriage binding in track.
Clean debris out of roller track and/or verify roller
bearings are greased and move freely.
UniLock vehicle restraint
does not release.
Motor or chain failure. Inspect motor and chain; repair or replace as
required.
Symptom Possible Cause Solution
Technical Service at 800-643-5424 or techservices@loadingdocksystems.com
If additional troubleshooting assistance is required, contact Systems, LLC
Technical Services with equipment serial number or customer order number (CO#).
4111-0073 — Sept. 2018
©
2018 Systems, LLC
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