Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
148/168
008831 en 2020.10
Faultfinding instructions
Compressor block
Symptom
Probable cause Solution
Excessive noise and
vibration
Main oil injection valve may be
closed.
Open valve.
Main oil injection valve may be open
too far.
Adjust.
Bearing damage or excessive wear. Replace bearings.
Slide valve/slide stop out of calibra-
tion (over or under compression).
Calibrate.
Coupling loose on shaft.
Tighten coupling. Replace if
damaged.
Refrigerant flood back (Liquid
slugging).
Correct system problem.
Capacity slide valve
and/or slide stop will
not move.
Cannot unload/load
or both
Oil pressure is not sufficient. Check oil pressure.
Solenoid coils may be burned out. Replace.
Incorrect setting of valves in the hy-
draulic system.
Check according to hydraulic system
description.
Malfunction of 4-way control valve of
slide components.
Check according to description of
main components.
Table 56: Compressor block
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