Group 04, Section 01, Page 2 Mechanical Dock Leveler – M and FMC
Issue Date: 10/01/01, Rev, 0 (Part #038-550E)
PROBLEM PROBABLE CAUSE
LIP DOES NOT RELEASE
AND SWING DOWN
WHEN TRUCK DEPARTS
1. Lip lock seized. Does not swing down from locked position.
- Lack of lubrication.
- Damaged by foreign material in pit.
2. Lip lock held in locked position by foreign material in pit.
DECK DOES NOT STAY
DOWN. SPRINGS BACK
UP AFTER WALKING
DOWN
1. Hold down cable broken.
2. Cable is extended and intact, but does not rewind.
- Foreign material in hold down box stopping rotation of
rewind wheel.
- Cable rewind spring broken.
- Cable out of place and jammed in hold down box.
3. Cable rewinds into hold down box, but does not lock.
- Pull chain or release lever jammed and not returning to
locked position.
- Foreign material lodged under release arm.
- Lock roller, wear strip and rewind wheel locking surfaces
worn from normal usage.
LIP STRIKES REAR OF
TRUCK AS DECK
RAISES, STOPS OR
SLOWS DOWN, AND LIP
DOES NOT LOCK IN
EXTENDED POSITION
1. Damaged or missing dock bumpers allow the vehicle to be
parked too close to the dock leveler.
2. Height differential between dock and truck bed is greater
than recommended.
3. Lip actuator assembly damaged causing lip to begin
extending too early in the cycle.
4. Lip actuator requires adjustment.
LIP WILL NOT CLEAR
REAR OF VEHICLE
WHEN ATTEMPTING TO
RETURN DOCK
LEVELER TO STORED
POSITION WITH TRUCK
PARKED AT DOCK
1. Damaged or missing dock bumpers allow truck to be parked
too close to the dock leveler.
2. Height differential between dock and truck bed is greater
than recommended.
3. Lip actuator damaged causing lip to be held out too late in
cycle.
4. Lip actuator requires adjustment.
DOCK BUMPER
DAMAGE THAT IS
ABNORMAL AND
EXCESSIVE
1. Shunting tractors with raiseable fifth wheel damage bumpers
by causing excess vertical movement of rear of trailer.
2. Air-ride suspension trailers can cause severe bumper
damage if the trailer is raised against the bottom of or
lowered on top of the bumper.
ONE FRONT CORNER
OF DOCK LEVELER SITS
HIGHER THAN THE
OTHER IN STORED
POSITION
1. Pit is out of level, side to side at rear corners or front corners.
DECK DRAGS ON SIDE
WALL OF PIT
1. Pit is out of square.
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