STR-4200™ Dok-Lok
®
Owner's Manual
Rite-Hite
®
16 Publication:
AMEN00102 2017-07-06
MAINTENANCE
Troubleshooting
Continued
PROBLEM
PROBABLE CAUSE
REMEDY
1 Unit faults after LOCK
button is pressed, never
gets an inside GREEN light
Damage or missing rear impact
guard
Restrain trailer by alternate means, place system in HORN-OVERRIDE
state
Truck not backed in straight or tight
against bumpers
Re-position trailer
Hydraulic system malfunction
Verify power unit runs for ~25sec and cylinders fully extend If not,
contact Rite-Hite
Sensor issue
Verify sensor operation and adjustment; see sensor testing and
adjustment procedure
2 Unit locks (gets inside
GREEN light) then faults
when a forklift enters or
leaves trailer
Trailer is not tight against bumpers
Re-position trailer
Damaged rear impact guard
Verify condition of rear impact guard, if damaged, restrain trailer by
alternate means and place system in HORN-OVERRIDE state
Sensor(s) out of adjustment
Verify sensor adjustment; see sensor testing and adjustment procedure
3 Hook does not raise and
lights do not flash
Power source malfunction
Check power source including building circuit breaker, 15A and 15A fuses
on power module
Power module failure
Verify appropriate motor output LED (M1), and SOL LED is lit when LOCK
button or UNLOCK button is pressed
Incorrect wiring
Verify wiring per electrical schematic
4 Lights are flashing, but
hook does not raise/lower
Hook needs to be lubricated
Lubricate hook shaft
Severed hose
Replace damaged hose as required
Sensor(s) out of adjustment
Verify appropriate LED is lit when LOCK button or UNLOCK button is
pressed
Check for defective push button board or ribbon cable
Disconnect cylinder and check extension / retraction without hook
attached
Verify wiring per electrical schematic
5 Is operational but hook
drops causing lights to
change and/or horn to
sound while trailer is being
serviced
Hook cylinder defective
Disconnect cylinder and check extension / retraction without hook
attached
6 Hook is operational but all
lights are out
Bulbs burnt out, loose or missing
Check all bulbs and replace as required
Damaged circuit board
If ISG and OSR LEDs are not flashing while in locked position or ISR and
OSG LEDs are not flashing while in UNLOCKED position, replace circuit
board
Incorrect wiring
Verify wiring per electrical schematic
7 Control box horn does not
sound, but lights and hook
are operational
Horn defective
Power horn using 12V DC power If horn does not sound, replace as
required
8 Hook is in stored position
with and inside green light
Incorrect wiring
Verify wiring of SW1 and SW2 at control box and outside junction box
9 Carriage does not return to
a full up position
Carriage binding in track
Check to see if roller track plate is clean and rollers are clean, free of
debris and lubricated Use only approved grease
Damaged roller track plate
Verify that roller track plate is straight and not damaged
Broken or weak springs
Replace as required
Improperly shimmed Base Plate
Shim and adjust as required
