42
PROBABLE CAUSE
AIR LEAKS
LEAKING VALVES
PISTON RING NOT SEALING
RESTRICTED AIR INLET
BLOWN GASKETS
VALVE UNLOADERS NOT FUNCTIONING
PROPERLY
SUGGESTED REMEDY
LOCATE AIR LEAKS BY SOUND OR SOAP BUBBLE TEST. TIGHTEN
OR REPLACE LEAKING FITTINGS ONLY AFTER REDUCING AIR
PRESSURE TO ZERO.
REMOVE VALVES AND INSPECT FOR DAMAGE TO VALVE SEAT OR
VALVE DISC. REPLACE SUSPECT COMPONENTS AND REINSTALL
VALVES USING NEW VALVE SEAT GASKETS AND COVER GASKETS.
REMOVE PISTON RINGS AND CHECK FOR WEAR. IF RING
THICKNESS HAS BEEN REDUCED TO 3/16 INCH OR LESS AT ANY
SPOT, THE RINGS SHOULD BE REPLACED. DO NOT BORE OR
HONE THE CYLINDER UNLESS IT IS BADLY SCORED OR PITTED.
REPLACE THE AIR FILTER ELEMENT. CHECK FOR ANY
OBSTRUCTIONS IN INLET AIR PIPING.
CHECK CYLINDER HEAD AND VALVE GASKETS - REPLACE AS
NECESSARY.
WITH THE COMPRESSOR RUNNING, DISCONNECT THE TUBING
TO THE VALVE UNLOADER ON THE CYLINDER HEAD. IF AIR DOES
NOT ESCAPE, BUT THE COMPRESSOR CONTINUES TO RUN
PARTIALLY OR COMPLETELY UNLOADED, REMOVE THE UNLOADER
ASSEMBLIES AND VALVES AND INSPECT. IF AIR DOES ESCAPE
FROM THE DISCONNECTED TUBING WITH THE COMPRESSOR
RUNNING CHECK FOR LOW OIL PRESSURE. IF AIR ESCAPES BUT
OIL PRESSURE IS NORMAL, REMOVE THE HYDRAULIC UNLOADER
AND PILOT VALVE AND CHECK THEIR VALVE SEATS. IT IS NORMAL
FOR AIR TO LEAK FROM THE DISCONNECTED TUBE WHEN THE
COMPRESSOR IS STOPPED IF A HYDRAULIC UNLOADER IS USED.
TOUBLESHOOTING CHART
INSUFFICIENT AIR PRESSURE OR VOLUME
TROUBLESHOOTING
WARNING: The compressor MUST be locked out
from all energy sources prior to inspection, and
all pressure MUST be relieved from unit to prevent
unexpected release.
There are times when any compressor, no matter how
well built and how accurately maintained, will exhibit
some trouble. While Hycomp engineers are available
to assist any customer experiencing compressor
diffi culties, the following tables are provided to assist
with initial diagnostics.
Find the section describing the general problem
exhibited, then check the probable cause.
If it is not possible to diagnose the cause of the
problem, contact Hycomp or a Hycomp authorized
dealer for assistance.
The only additional problem encountered with the
gas compressors is excess loss of gas through the
packings. Generally the problem is caused by improper
maintenance of the gas packings. However, if the gas
packings have been well maintained, and leaks still
persist, contact the factory.
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