TM 5-3805-260-24
SYMPTOMS
CAUSE
REMEDY
governor is operating properly, replace the
unloader pistons and plungers and inspect
their bores in the cylinder block. Clean
lubricate as necessary. Inspect for bent,
kinked or blocked tubing leading to or from
the governor.
G.
Faulty compressor.
G.
Replace or repair the compressor after
determining none of the preceding
installation defects exist.
33. Compressor fails to unload.
A.
Faulty governor or
A.
Test the governor for proper operation
governor 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.
34. Compressor leaks oil.
A.
Damaged mounting
A.
Check the compressor mounting bolt
gasket.
torque. If the mounting bolt torque is low,
replace the compressor mounting gasket
before retorquing the mounting bolts.
B.
Cracked crankcase,
B.
Visually inspect the compressor exterior
cylinder block or end
for cracked or broken components. Cracked
cover.
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
C.
Check the cap screw torques and tighten
cylinder 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
E.
Replace the compressor if porosity is
casting.
found.
F.
Mounting flange or end
F.
Replace as necessary.
cover, O-Ring or gasket-
missing, cut, or damaged.
35. 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.
C.
Test for excessive system leakage as
leakage.
instructed in Symptom 32, Remedy E.
Reduce leakage wherever possible.
D.
Excessive reservoir
D.
Drain reservoirs.
contaminants.
2-37
