BENDIX BA-921 COMPRESSOR-STD-CLOSED ROOM Dati di servizio - Pagina 13
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BACK / RETOUR
COMPRESSOR TROUBLESHOOTING CHART (Continued)
SYMPTOMS
2. (Continued.)
3. Excessive build-up and
recover time. Compressor
should be capable of
building air system from
85-100 psi in 40 seconds
with engine at full
governed rpm. Minimum
compressor performance
is certified to meet Federal
requirements by the
vehicle manufacturer. Do
not downsize the original
equipment compressor.
CAUSE
D. Worn or burned out
bearings.
E. Faulty compressor.
A. Dirty induction air filter.
B. Restricted induction line.
C. Restricted discharge line
or compressor discharge
cavity.
D. Slipping drive components. D. Check for faulty drive gears and couplings and
E. Excessive air system
leakage.
F. Sticking unloader pistons.
G. Faulty compressor.
REMEDY
D. Check for proper oil pressure in the compressor.
Minimum required oil pressure; 15 psi engine
idling, 15 psi maximum governed engine rpm.
Check for excessive oil temperature—should not
exceed 240 degrees Fahrenheit.
E. Replace or repair the compressor after
determining none of the preceding installation
defects exist.
A. Inspect engine or compressor air filter and
replace if necessary.
B. Inspect the compressor air induction line for kinks
and restrictions and replace as necessary.
C. Inspect the compressor discharge port and line
for restrictions and carbon build-up. If a carbon
build-up is found, check for proper compressor
cooling. Replace faulty sections of the discharge
line.
replace as necessary. Check the condition of
drive belts and replace or tighten, whichever is
appropriate.
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 drops should not exceed:
1. 2 psi in each reservoir for a single vehicle.
2. 6 psi in each reservoir for a tractor and trailer.
3. 8 psi in each reservoir for a tractor and 2
trailers.
F. Check the operation of the unloading mechanism.
Check for proper operation of the compressor air
governor. Make certain the air connections
between the governor and compressor are
correct. Refer to figure 3. If the governor is
operating properly, replace the unloader
mechanism. Inspect for bent, linked or blocked
tubing leading to or from the governor.
G. Replace or repair the compressor after
determining none of the preceding installation
defects exist.
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