RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
S70-200 IOM
Page 36
TROUBLESHOOTING THE HYDRAULIC SYSTEM
SYMPTOM
PROBABLE CAUSES and CORRECTIONS
SLIDE VALVE WILL NOT LOAD OR
Solenoid coils may be burned out, replace.
UNLOAD
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.
Solenoid may be mechanically actuated by inserting a piece of 3/16" rod
against armature pin and pushing spool to opposite end. Push A side to
confirm unload capability. If valve works, problem is electrical.
SLIDE VALVE WILL LOAD BUT
A side solenoid coil may be burned out, replace.
WILL NOT UNLOAD
Dirt inside solenoid valve preventing valve from operating both ways, clean.
Solenoid may be mechanically actuated by inserting a piece of 3/16" rod
against armature pin and pushing spool to opposite end. Push A side to
confirm unload capability. If valve works, problem is electrical.
SLIDE VALVE WILL UNLOAD BUT
A side solenoid coil may be burned out, replace.
WILL NOT LOAD
Dirt inside solenoid valve preventing valve from operating both ways, clean.
Solenoid may be mechanically actuated by inserting a piece of 3/16" rod
against armature pin and pushing spool to opposite end. If valve works,
problem is electrical.
SLIDE STOP WILL NOT FUNCTION
Solenoid coils may be burned out, replace.
EITHER DIRECTION
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.
