Poweramp POWERSTOP AUTO 11.1996 - Manual (Page 19)

Electrical Troubleshooting - Continued
17
PROBLEM POSSIBLE SOLUTION(S)
Restraint does not lower - motor runs in
pressure relief, inside & outside lights
work. 1. Solenoid spool mechanically stuck ON. Remove
spool from hydraulic block. Inspect block for
contaminants. Test. Replace if necessary.
NOTES:
DO NOT RUN MOTOR WHEN SPOOL IS REMOVED FROM
BLOCK.
DO NOT OVERTIGHTEN COIL ON SPOOL. N UT IS TO
ONLY BE TIGHTENED TO PREVENT COIL FROM FALLING
OFF SPOOL.
DO NOT OVERTIGHTEN SPOOL INTO BLOCK. SPOLL IS
ONLY TO BE TIGHTENED TO PREVENT FLUID EXIT FROM
BLOCK VIA SPOOL WHEN UNIT OPERATING.
Restraint does not lower - motor does
not run, inside & outside lights work. 1. Obstruction activating limit switch lever. Remove
obstruction. Make sure lever operates freely.
2. Defective limit switch. Use voltmeter to test switch
contact operation.
3. Defective control relay(s). Use voltmeter to test
voltage at relay(s) coil & to test relay(s) contact
operation.
4. No voltage at motor. Use voltmeter to test voltage
at motor.
5. Thermal protector inside motor has tripped. Wait
for protector to reset.
Light(s) does not work or light(s) does
not work correctly - restraint raises &
lowers. 1. Defective bulb. Replace.
2. Obstruction preventing activation or deactivation of
limit switch lever. Remove obstruction. Make sure
lever operates freely.
3. Defective limit switch. Use voltmeter to test switch
contact operation.
4. Defective control relay. Use voltmeter to test
voltage at relay coil & to test relay contact operation.
5. Defective contact block(s) at light control selector
(or key) switch. Use voltmeter to test.