©2014 4Front Engineered Solutions, Inc.
March 2014
6004753N — Hydraulic Dock Leveler - One Button Control — Safe
T
Frame
™
37
TroUbLesHooTing gUiDe,
continued
2. Downward speed of the ramp is controlled by a needle
valve located in the pump/motor. Turn valve in to
eliminate locking. See Fig. 43. See chart on page 39 for
amount of time dock leveler should move from its fully
raised position to full below dock position.
noTe:
Do not adjust needle valve more than 1/4 turn. Test operation.
Readjust turning valve a maximum of 1/4 turn between testing.
During TESTING DO NOT TURN MORE THAN FOUR (4)
1/4 TURNS.
Dock LeVeL sUPPorTs wiLL noT reTracT for
beLow Dock oPeraTion:
1. Check for broken chain to dock level support legs. See
Fig. 44.
2. Check connection of dock level control chain to the dock
level support legs. See Fig. 44.
3. Check for binding of dock level control chain. See Fig.
44.
4. Check for binding in dock level support legs.
5. Check length of below dock control chain. Adjust chain
so dock level support legs are retracted as shown in Fig.
44.
Dock LeVeL sUPPorT Legs wiLL noT swing fULLy
forwarD:
noTe:
Lip must be pendant.
1. Check for binding or debris which may be restricting leg.
2. Check below dock control chains to ensure chain has
enough slack to allow leg to swing forward. Adjust as
required. See Fig 44.
LiP PLaTe wiLL noT sTay oUT/faLLs as LeVeLer is
Lowering:
1. Pilot operated check valve (PC2) may not be closing.
Remove and inspect for foreign matter. Clean as
required. See Fig 45.
Dock level
support leg
BDC
chain
Fig. 44
Fig. 45
Needle valve adjusting
screw. Turn screw
clockwise to
increase time.
Needle valve
locking nut
Fig. 43
Pilot operated
check valve (PC2)
