TM 5-3805-263-14&P-3
SYMPTOMS
CAUSE
REMEDY
G. Faulty compressor
G. Replace or repair the compressor after
determining none of the preceding
installation defects exist.
4. Compressor fails to unload
A. Faulty governor or governor
A. Test the governor for proper operation
installation
and inspect air lines to and from the gover-
nor for kinks or restrictions. Replace or
repair the governor or its connecting air
lines.
B. Faulty or worn unloader
B. Inspect for worn, dirty or corroded unloader
pistons or bores
pistons and their cylinder block bores.
Replace as necessary.
5. Compressor leaks oil
A. Damaged mounting gasket
A. Check the compressor mounting bolt
torque. If the mounting bolt torque is low,
replace the compressor mounting gasket
before retorquing the mounting bolts.
B. Cracked crankcase, cylinder
B. Visually inspect the compressor exterior
block or end cover
for cracked or broken components. Cracked
or broken crankcases or mounting flanges
can be caused by loose mounting bolts.
The end cover can be cracked by over-
torquing fitting or plugs installed in the end
cover. Replace or repair the compressor as
necessary.
C. Loose end cover or cylinder
C. Check the cap screw torques and tighten
block cap screws
as necessary.
D. Loose oil supply or return
D. Check the torque of external oil line
line fittings
fittings and tighten as necessary.
E. Porous compressor casting
E. Replace the compressor if porosity is
found.
F. Mounting flange or end
F. Replace as necessary.
cover, O-Ring or gasket-
missing, cut, or damaged.
6. Compressor constantly cycles
A. Leaking compressor
A. Remove the compressor inlet air strainer
(compressor remains
unloader pistons
or fitting. With the compressor unloaded
unloaded for a very short
(not compressing air), check for air
time.)
leakage around the unloader pistons.
Replace as necessary.
B. Faulty governor
B. Test the governor for proper operation and
repair or replace as necessary
C. Excessive system leakage
C. Test for excessive system leakage as
instructed in Symptom 3, Remedy E
Reduce leakage wherever possible
D. Excessive reservoir
D. Drain reservoirs.
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