TM 9-2320-273-20
Table 9-1. Compressed Air and Brake System Troubleshooting Procedures.
MALFUNCTION.
TEST OR INSPECTION.
CORRECTIVE ACTION.
1.
INSUFFICIENT AIR PRESSURE:
Step 1.
Check for air exhausting through open or damaged air reservoir drain valves.
a.
Close or replace manual drain valve (para 9-13).
b.
Replace automatic drain valve on supply reservoir (para 9-12).
Step 2.
Check for loose air connections between the compressor, governor, and air reservoirs.
Tighten any loose air connections and replace damaged components.
Step 3.
Check governor for proper operation and adjustment. Should be set to control pres-
sure in supply reservoir at 105-125 psi (724-862 kPa).
Refer problem to Direct Support Maintenance.
Step 4.
With the engine not running, loosen the compressor output line at the compressor and
listen for escaping air.
a.
If air escapes continuously, replace the check valve in that line at the supply
reservoir (para 9-15).
b.
If the check valve is okay, refer problem to Direct Support Maintenance.
Step 5.
Check air Iine connections for tightness and air lines for cracks or breaks.
Tighten or replace connections and lines as necessary.
2.
EXCESSIVE SYSTEM PRESSURE INDICATED:
Step 1.
Check for inoperative pressure safety relief valve on the supply reservoir.
Replace the safety release valve (para 9-14) only if reservoir exceeds 150 psi.
Step 2.
Check governor for proper operation.
Refer problem to Direct Support Maintenance.
3.
PARK BRAKES WILL NOT RELEASE:
Step 1.
Check reservoir pressure gage and verify LOW PRESSURE warning lamp is out.
See Malfunction 1.
Step 2.
Verify PARK BRAKE manual valve is closed.
Close valve; if valve will not close, refer to para 9-19.
Step 3.
Check air lines for leakage or damage. Use a soap solution to check for leakage at
connections and watch for bubbles.
Replace damaged lines and tighten loose connections (para 9-36).
9-3
