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Page Title:
PRESSURE TOO HIGH, OR COMPRESSOR WON'T CUT OUT |
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 TM 9-2320-285-24-2
3-21. TREADLE VALVE AND BRAKE CONTROLS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4
PRESSURE TOO HIGH, OR COMPRESSOR WON'T CUT OUT
Step 1
Remove air compressor governor (para 3-25a).
Check for obstruction in passage between air compressor and governor.
a
If passage is clogged, clean.
b
If passage is not clogged, proceed to step 2 below.
Step 2
Install replacement air compressor governor (para 3-25a).
Check air compressor governor adjustment (para 2-52d).
a
If malfunction is corrected, repair or replace air compressor governor (para 2-52d).
b
If malfunction is not corrected, clean air compressor cylinder head (para 3-25b); repair or replace
stuck inlet valves or leaking unloader grommets and back-up rings (para 3-25b), if necessary.
5
PARKING (SPRING) BRAKES WON'T RELEASE
Step 1
With AIR PRESS gage indicating 60 psi minimum and PARKING BRAKE valve pushed down fully,
check emergency quick release valve, emergency port of rear axle brakes air chambers, and
PARKING BRAKE valve for air leaks.
a
If a component is leaking air, repair or replace (para 3-24b, 2-51d(2), or 3-24a).
b
If components are not leaking air, proceed to step 2 below.
Step 2
Open drain cock on service air reservoir to relieve air system pressure.
Disconnect air brake tubing from elbow connector at emergency quick release valve (para 2-51a).
Install calibrated air pressure gage on tubing.
Close drain cock on service air reservoir.
Start engine and allow air system to charge to at least 60 psi pressure.
Push PARKING BRAKE valve in fully.
Watch AIR PRESS gage and test gage indications.
a
If test gage indication differs from AIR PRESS gage indication by more than 10 psi, repair or
replace PARKING BRAKE valve (para 3-24a).
3-155
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