Poweramp POWERHOOK SERIES - Manual (Page 42)

TROUBLESHOOTING POWERHOOK
Symptom Possible Cause Solution
Restraint does not
lower at all from
stored position. Pump
operates in pressure
relief (restraint does not
extend). Solenoid “D” 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 “D” coil not
receiving signal to energize.
A solenoid that is energized
will act like a magnet.
Place a metal tool on coil of
solenoid valve 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
ON.
2. Check all wiring to solenoid for high resistance
(loose) or no connection.
Solenoid “D” coil receiving
signal but not energizing. Coil failed OPEN. Consult factory for replacement.
Obstruction preventing the
restraint from lowering. Remove obstruction, check for damage to
components.
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.
4111-0010 — Nov 2010 40