TM 9-2320-269-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AIR SYSTEM AND BRAKES - CONTINUED
LOW AIR PRESSURE OR SLOW BUILDUP - CONTINUED
Step 8. Test air compressor governor (1) for proper operation.
a. Turn draincocks open, let air drain (page 2-106), and turn draincocks closed.
NOTE
Aways use a pressure gage known to be accurate when testing. Do not rely on instrument panel gages.
b. Remove air gage line (2) and install test gage onto line (3) using 1/2-inch and 9/16-inch
wrenches.
c. Start engine (TM 9-2320-269-10), and watch gage as pressure builds.
d. Check gage reading when compressor (3) cuts out, make several brake applications until
compressor (3) cuts in, and check gage reading.
WARNING
When doing tests with engine running, stand aside to avoid personnel injury from moving parts.
e. If compressor (3) cuts out below 110 psi (758.45 kPa), or cuts in below 93 psi (641.23 kPa),
adjust governor (1) by removing cover (4) and turning adjusting screw (5) in to lower pressure
setting, or out to raise pressure setting, using 7116-inch wrench and flat-tip screwdriver.
f. Install cover (4), and shut off engine.
Step 9. Test air compressor (3) for leakage.
a. Coat compressor head gasket (6) with soap solution.
b. Start engine (TM 9-2320-269-10), let air pressure build up.
c. If head gasket (6) shows signs of leakage, replace air compressor (page 2-593), or notify Direct
Support Maintenance.
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