Poweramp POWERHOOK SERIES - Manual (Page 41)

Symptom Possible Cause Solution
Restraint extends from
stored position without
fully lowering. Proximity switch at trunnion
that senses when restraint
lowered target 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.
Restraint extends from
stored position without
lowering at all. Proximity switch at trunnion
that senses when restraint
lowered target 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 “B” valve 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.
Solenoid “B” coil is not
receiving signal to energize.
A solenoid that is energized
will act like a magnet.
Place a metal tool on coil of
solenoid to determine if coil
is receiving signal. 1. Check controller output that sends a signal to
solenoid. Output may have failed OPEN. Use
meter to check for contact closure when output
is ON.
2. Check all wiring to solenoid for high resistance
(loose) or no connection.
Solenoid “B” coil receiving
signal but not energizing. Coil failed OPEN. Consult Factory for replacement
part.
TROUBLESHOOTING POWERHOOK
4111-0010 — Nov 2010 39