3-19. AIR BRAKE SYSTEM TROUBLESHOOTING (CONT)
TEST OR INSPECTION
7. AIR COMPRESSOR FAILS TO MAINTAIN SUFFICIENT AIR PRESSURE (Cont).
Step 2. Remove engine right side panels (page 9-14).
Open drain valve located at bottom of air compressor and drain air.
Disconnect hose shown below and install 3/8 NPT pipe cap on adapter
to which hose was connected. Close drain valve.
Start engine and operate at 1000 rpm. Wait several minutes and check
if air compressor maintains air pressure.
a . I f s u f f i c i e n t a i r p r e s s u r e i s m a i n t a i n e d s h u t o f f e n g i n e a n d go
to MALFUNCTION 3, step 10 (page 3-124).
b . I f s u f f i c i e n t a i r p r e s s u r e s t i l l i s n o t m a i n t a i n e d , s h u t o ff
engine, open air reservoir drain valve, remove 3/8 NPT pipe cap,
reconnect hose, close drain valve, and go to step 3 below.
Start engine and allow air pressure to build up.
Inspect air compressor lines for air leakage (page 7-102).
a. If air compressor lines are leaking tighten; if tightening does
no good, replace leaking hoses or fittings (page 7-106).
b. If air compressor lines are okay, go to step 4 below .
Step 4. Check air compressor governor adjustment (page 7-100).
a. If governor adjustment is not okay, adjust (page 7-100) .
If governor cannot be adjusted, replace it (page 7-98).
b. If governor adjustment is okay, go to step 5 below.