TM 5-3740-214-14
Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOZZLE PRESSURE BELOW 90 PSI (Continued)
a.
If any of the above fittings are loose, tighten them when the nozzle reaches normal operating
temperature and go to Step 4c.
b.
If the fittings above are warped and cannot be tightened to stop air leaks, replace them and go to Step
4c.
c.
After tightening or replacing any of the above parts, start the engine and check the pressure gage.
(1)
If the pressure is 90-100 psi, the problem is solved.
(2)
If the pressure is less than 90 psi, go to Step 5.
Step 5.
Check gaskets for leaks while the engine is running.
a.
Feel around the head seams for air leaks.
(1)
If there are air leaks, go to Step 6.
(2)
If there are no air leaks, go to Step 6.
NOTE
Even if there are no apparent air leaks, a loss of pressure can be caused by bad valves.
b.
Feel around the pulsation tank and head connection for air leaks.
(1)
If there are no air leaks, go to Step 6.
(2)
If there are air leaks, go to Step 6b.
Step 6.
Check the compressor cylinder head assembly for air leaks.
a.
Disassemble head assembly.
(1)
Disconnect the nozzle adjusting nut and separate the nozzle from the swivel elbow.
(2)
Disconnect the air hose from the pulsation tank.
(3)
Loosen pulsation tank screws.
(4)
Remove the head mounting screws.
(5)
Separate head assembly and valve plates from compressor.
(6)
Separate compressor heads from pulsation tank.
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