Ramp Will Not Return To Stored Position From Full Below Dock Position; Ramp Lock During Downward Travel - Kelley HK User Manual

TroUbLesHooTing gUiDe,
raMP wiLL noT reTUrn To sToreD PosiTion
froM fULL beLow Dock PosiTion:
(Applies to A.R.T.D. 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 "STOP" button is out.
2. Check to be sure the control box switch is in the "ON"
position.
3. Check for electrical power to control box.
4. 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.
5. 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 15 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 solenoid valve "STOP" function for proper
operation.
2. Check for debris in pit which may be restricting downward
travel.
3. 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.
36 6004754F — HK and HK-S Hydraulic Dock Leveler, 3 Button — Safe
©2009 4Front Engineered Solutions, Inc.
continued
Fig. 42
Lip
Needle valve
Fig. 43
adjusting screw
turn screw clockwise
to increase time
Ramp
Return to dock
switch assembly
Needle vavle
locking nut
T
Frame January 2009
™