©2014 4Front Engineered Solutions, Inc.
March 2014
6004753N — Hydraulic Dock Leveler - One Button Control — Safe
T
Frame
™
35
TroUbLesHooTing gUiDe,
continued
Be certain, before climbing into the dock leveler pit or
doing any maintenance or repair under the dock leveler,
that: 1) THE MAINTENANCE STRUT AND LIP LOCK ARE
SECURELY IN PLACE, [see Fig. 38} and 2) the power is
disconnected and properly tagged or locked off.
Before servicing the dock leveler, read and follow the
Safety Practices on page 3 and the Operation section of
this manual.
raMP faiLs To raise:
1. If motor fails to run:
1.1 Check that all cords are wired into the junction box.
1.2 Check for electrical power to the control box.
1.3 Check “ON/OFF” switch on control box.
Before doing any electrical work, make certain the power
is disconnected and properly tagged or locked off.
1.4 Check for loose wires in control box.
1.5 Check fuses. Replace if required.
1.6 If problem can not be found, contact a qualified
electrician.
2. If motor runs:
2.1 Check hydraulic oil level in reservoir. Add if
required. See Fig. 39 for proper levels and types of
oil to be used.
2.2 Check for loose hydraulic hose fittings or broken
hoses. Repair or replace as required.
2.3 Check for binding in ramp cylinder pivots.
2.4 Check hydraulic bypass pressure and adjust as
required. See Fig. 40.
LiP faiLs To exTenD:
1. Check for damage to lip cylinder and/or pivot pins.
2. Check for leakage in lip cylinder or hydraulic hose
feeding cylinder.
3. Check for binding in lip hinge.
4. Check hydraulic oil level in reservoir. Add if required.
See Fig. 39.
5. Check hydraulic bypass pressure and adjust as required.
See Fig. 40.
6. Check lip sequence valve pressure setting. See Fig. 41.
3"- 4"
Use type 5606 (low temp.)
hydraulic oil.
Check oil level with ramp
raised and lip extended
Fig. 39
Bypass pressure locking nut
Detail A
Set bypass pressure at
2000 PSIG with ramp
raised and lip
extended.
RV1, bypass
pressure adjusting
screw. Turn screw
clockwise to
increase pressure
A
Fig. 40