TM 5-3805-263-14&P-3
SYMPTOMS
CAUSE
REMEDY
D. Worn or burned out
D.
Check for proper oil pressure in the
compressor. Minimum required oil pres-
sure; 5 psi engine idling, 15 psi maximum
governed engine rpm. Check for excessive
oil temperature-should not exceed 2400 F.
E. Faulty compressor
E.
Replace or repair the compressor after
determining none of the preceding installa-
tion defects exist.
3. Excessive build-up and
A. Dirty induction air filter
A.
Inspect engine or compressor air filter and
recovery time. Compressor
replace if necessary.
should be capable of building
B. Restricted induction line
B.
Inspect the compressor air induction line for
air system from 85-100 psi in
for kinks and restrictions and
40 seconds with engine at
replace as necessary.
full governed rpm. Minimum
compressor performance is
C. Restricted discharge line or
C. Inspect the compressor discharge port and
certified to meet Federal
compressor discharge cavity
line for restrictions and carbon build-up.
certified to meet Federal
If a carbon build-up is found, check for
requirements by the vehicle
proper compressor cooling.
manufacturer.
Replace faulty sections of the discharge
line.
D. Slipping drive components
and replace as necessary. Check the condi-
tion of drive belts and replace or tighten,
whichever is appropriate.
E. Excessive air system leakage
E. Test for excessive system leakage and
repair as necessary. Use the following as a
guide:
Build system pressure to governor cutout
and allow the pressure to stabilize for one
minute. Using the dash gauge, note the
system pressure and the pressure drop after
two minutes.
The pressure drop should not exceed 2 psi
in each reservoir.
F. Sticking unloader pistons
F. Check the operation of the unloading
and plungers
pistons in the inlet cavity of the com-
pressor. Both pistons should have the
plunger flanges resting on the inlet cavity
floor when the compressor is loaded
(pumping air). If the pistons and plunger are
not fully retracted, check for proper opera-
tion of the compressor air governor. If the
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
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