Poweramp POWERHOOK SERIES - Manual (Page 43)

TROUBLESHOOTING POWERHOOK
Symptom Possible Cause Solution
Restraint only partially
lowers from stored
position. Pump operates
in pressure relief
(Restraint does not
extend). Obstruction preventing the
restraint from lowering. Remove obstruction.
Fluid flow to positioning
cylinder blocked. Locate the needle valve that controls fluid flow to the
cylinder. (Hook valve block has two needle valves,
adjust valve adjacent to NV stamped in valve block)
Turn valve out all the way counter clockwise. Turn
valve in all the way clockwise. Turn valve out 1-1/2
turn counter clockwise
Binding inside positioning
cylinder. Locate the positioning cylinder and the hook
weldment. Pushing down on the hook weldment
should extend the positioning cylinder and releasing
the weldment should allow the positioning cylinder to
retract. Consult factory if this does not occur.
Restraint fully lowers
from stored position but
does not extend. Proximity switch at trunnion
that senses when restraint
lowered target and/or
switch out of adjustment. Locate switch on hook trunnion. Observe indicator
light at controller input (#3) that receives signal from
switch. Input light should only turn ON when restraint
fully lowered. If this does not occur, adjust target
counterclockwise. See Adjustments section: Adjust
PowerHook Operating Range.
NOTE: Check circuit breaker inside control assembly
before replacing switch. Make sure breaker is ON.
Use a screwdriver as a temporary target to test
switch. Adjust switch closer to target if input light
turns on. Replace switch if screwdriver is present and
input light on controller does not turn on.
Solenoid “B” valve stuck
ON or Solenoid(s) “C1” or
C2” valve(s) stuck ON. Locate solenoid (See Parts: Valve Block).
Remove coil from cartridge valve and cartridge valve
from valve block.
-Check valve for contaminant’s and/or damage.
-Replace valve if damaged.
Carefully wipe valve with clean rag (do not damage
“O” rings on valve.
-Check valve block for contaminant’s.
-Replace valve and coil.
NOTE: Do not over tighten valve into block. Max Torque:
30-40 lb/ft. or snug to prevent leakage. Tighten coil snug,
avoid over tightening and causing valve to bind.
Operate unit. Replace valve if problem persists and
all other troubleshooting procedures performed.
Restraint does not
tightly engage truck/
trailer RIG bar (inside
lights turn GREEN but
gap exists between RIG
bar and restraint. Pressure switch trip point
set too low.
Pressure differential switch
trip point set too Low.
Pressure switch is factory set. Do not attempt to
adjust in field replace switch from factory pre-set unit.
Pressure differential switch is factory set. Switch
must be replaced.
Incorrect type of hydraulic
fluid used. Drain and re-fill system with proper fluid. See
Maintenance section for proper fluid level and type.
4111-0010 — July 2003 4111-0010 — Nov 2010 41