Poweramp POWERHOOK SERIES - Manual (Page 44)

TROUBLESHOOTING POWERHOOK
Symptom Possible Cause Solution
Restraint engages truck/
trailer RIG bar but does
not automatically shut
OFF. Pump operates in
pressure relief. Pressure switch trip point
set too high.
Pressure differential switch
trip point set too high.
Pressure switch is factory set. Do not attempt to
adjust in field replace switch with factory.
Pressure differential switch is factory set. Switch
must be replaced.
Restraint extends
from RIG bar engaged
position, fully lowers but
does not retract. Solenoid “B” valve stuck
ON, or solenoid(s) “C1” or
“C2” stuck OFF. 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.
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.
Use a screwdriver as a temporary target to test
switch. Replace switch if screwdriver is present and
input light on controller does not turn on.
Solenoid “C1” or “C2” coil(s)
not receiving signal to
energize. A solenoid that
is energized will act like
a magnet. Place a metal
tool on coils of solenoids
to determine if coils are
receiving signal. Check Controller output that sends the solenoid
signal. Output may have failed OPEN. Use meter
to check for contact closure when output ON.
Check all wiring to solenoids for high resistance
(loose) or no connection.
Solenoid “C1” or “C2” coil(s)
receiving signal but not
energizing. Coil(s) failed OPEN. Consult factory for replacement
coil.
4111-0010 — Nov 2010 42