Poweramp POWERHOOK SERIES - Manual (Page 40)

Symptom Possible Cause Solution
Restraint does not
fully extend or motor
overcurrent device and/
or overload device
continuously tripping. Low hydraulic fluid. Add fluid, see Maintenance section for proper fluid
level and type.
Restraint lowers, fully
extends but does not
raise. Pump operates in
pressure relief. Solenoid “D” valve 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.
Proximity switch on guide
track that senses when
restraint is fully extended is
out of adjustment. Locate switch on end of guide track closest to hook
tip. Observe indicator light at controller input (#4)
that receives signal from switch. Input light should
turn OFF when restraint fully extended. If this does
not occur:
-Check switch position, loosen two guide track
mounting bolts, tap guide track assembly back
towards rear pit wall.
-Switch should be positioned approximately 1/4”
from the inside wall of the track. Make sure that the
switch face does not extend further than the guide
track mounting bars welded to the cylinder. Position
switch so that face will not come into contact with
guide rod.
-Tighten nuts to secure switch. DO NOT over tighten
nuts. Maximum tightening torque is 25 lb/ft.
-Run restraint. Make sure motor shuts off when
hook is in stored position. If motor does not shut
off, reposition guide track slightly forward of current
position.
TROUBLESHOOTING POWERHOOK
4111-0010 — Nov 2010 38