Kelley HK-S User Manual page 36

TroUbLesHooTing gUiDe,
LiP exTenDs before raMP reacHes fULL aboVe
Dock PosiTion:
1. Check lip sequence valve pressure setting. See Fig. 41.
LiP faiLs To DroP To THe PenDanT PosiTion wHen
raMP is raiseD froM VeHicLe:
1. Check for damage to lip cylinder and/or pivot pins.
2. Check for binding in lip hinge.
3. Check lip sequence valve pressure setting. See Fig. 41.
raMP wiLL noT reTUrn To sToreD PosiTion froM
fULL beLow Dock PosiTion:
(Applies to ARTD option only)
noTe:
Ramp will not raise if a lift vehicle or other heavy material is
left on top of the ramp.
1. Check to be sure the control box switch is in the "ON"
position.
2. Check for electrical power to control box.
3. Check to assure that the dock leveler lip is falling to the
full pendant position. Lip should be 1/2" to 1-1/2" from
the face of the dock when the ramp is in the full below
dock position. The return to dock switch is connected to
the lip and will not operate if the lip remains in the full or
partially extended position.
4. Check return to dock switch and mounting bracket. If
hardware is loose or missing, the switches can move
on the brackets. Switch contacts should be closed when
dock leveler is full below dock and lip is pendant. See
wiring diagrams on pages 21 through 24. See Fig. 42.
noTe:
Return to dock level switch should turn off pump/motor when
ramp reaches approximately 4" to 6" above dock level.
raMP Lock DUring DownwarD TraVeL:
1. Check for debris in pit which may be restricting downward
travel.
36 6004753N — Hydraulic Dock Leveler - One Button Control — Safe
©2014 4Front Engineered Solutions, Inc.
continued
Fig. 41
Set lip sequence
pressure at 1500
PSIG. Pressure
gauge should
read 1500 PSI
before lip begins
to extend
Lip sequence valve
pressure adjusting
screw.Turn screw
clockwise to increase
pressure.
Sequence valve locking nut
Fig. 42
Lip
Auto Return to Dock
switch assembly
Detail A
Ramp
T
Frame March 2014
™