TM 5-3805-262-20
3-19. AIR BRAKE SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. AIR PRESSURE WILL NOT BUILD UP TO NORMAL.
Step 1.
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. See if air pressure builds up
to normal.
a .
b .
I f a i r p r e s s u r e b u i l ds
MALFUNCTION 3, step 10
If air pressure still will not build up to normal, shut off
up to normal, s h u t o f f e n g i n e a n d g o t o
(page 3-124).
engine, open air reservoir drain valve, remove 3/8 NPT pipe cap,
reconnect hose, close drain valve, and go to
Step 2. Check air compressor drive belt adjustment (page
a. If air compressor drive belt is not adjusted
(page 7-97).
step 2 below.
7-97).
p r o p e r l y , a d j u st
b. If air compressor drive belt is adjusted properly, go to step 3
below.
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