Poweramp POWERHOOK P4111-0010 5.2006 - Manual (Page 45)

43 4111-0010 — December 2004
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 switch is factory set. Do not attempt to
adjust in field. Return to factory for adjustment or
replace switch with factory pre-set unit.
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 overtighten valve into block. Max Torque:
30-40 lb/ft. or snug to prevent leakage. Tighten coil snug,
avoid overtightening 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.