RWF II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.610-IOM (JUN 11)
Page 39
TROUBLESHOOTING THE HYDRAULIC SYSTEM
SYMPTOM PROBABLE CAUSES and CORRECTIONS
SLIDE VALVE WILL NOT LOAD OR
UNLOAD
Solenoid coils may be burned out. Test and replace if necessary.
Valve may be closed. Open hydraulic service valves.
Solenoid spool may be stuck or centering spring broken. Replace.
Check outputs 2 and 3 and fuses.
Check LED on coil. If lit, there is power to the coil. Check coil.
Solenoid may be actuated mechanically by inserting a piece of 3/16" rod
against armature pin and pushing spool to opposite end. Push A side to
conrm unload capability. If valve works, problem is electrical.
SLIDE VALVE WILL LOAD BUT
WILL NOT UNLOAD
A side solenoid coil may be burned out. Test and replace if necessary.
Dirt inside solenoid valve preventing valve from operating both ways. Clean.
Check LED on coil. If lit, valve is functioning mechanically. Problem is electrical.
Solenoid may be actuated mechanically by inserting a piece of 3/16" rod
against armature pin and pushing spool to opposite end. Push A side to
conrm unload capability. If valve works, problem is electrical.
SLIDE VALVE WILL UNLOAD BUT
WILL NOT LOAD
A side solenoid coil may be burned out. Test and replace if necessary.
Dirt inside solenoid valve preventing valve from operating both ways. Clean.
Check LED on coil. If lit, valve is functioning mechanically. Problem is electrical.
Solenoid may be actuated mechanically by inserting a piece of 3/16" rod
against armature pin and pushing spool to opposite end. Push A side to
conrm unload capability. If valve works, problem is electrical.
SLIDE STOP WILL NOT FUNCTION
EITHER DIRECTION
Solenoid coils may be burned out. Test and replace if necessary.
Solenoid service valves may be closed. Open.
Manually actuate solenoid. If slide stop will not move mechanical problems
are indicated. Consult Frick factor or Frick service.
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