Poweramp POWERSTOP A 11.1996 - Manual (Page 18)

Troubleshooting
Hydraulic Troubleshooting
15
Problem Possible Solution(s)
Restraint will not raise. 1. Remove excess load from restraint. Unit is
designed to raise no more than its own weight as a
safety feature.
2. Strainer element plugged. Remove reservoir and
clean or replace strainer element.
Restraint moves very slowly. 1. Low hydraulic fluid. Add hydraulic fluid as needed.
2. Pump by-pass set too low. Pump by-pass
adjustment is internal to pump, consult factory.
Restraint moves in one direction only
reguardless of button pushed. 1. 4 way valve stuck in either position. Locate
solenoid. Remove coil from spool and spool from
valve block. check spool for contaminants and/or
damage. Replace spool if damaged. Carefully wipe off
spool with clean rag (do not damage "O" rings on
spool) Check valve block for contaminants. Replace
spool in block and coil on spool. DO NOT overtighten
spool into block. Maximum tightening torque for
spool is 35-40 lb./ft. DO NOT overtighten coil on spool.
Operate the unit. Replace spool if problem persists
and all other troubleshooting procedures performed.