Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
TEST OR INSPECTION
NOZZLE PRESSURE BELOW 90 PSI (Continued)
If the valve plates are warped or bent, replace them and go to Step 6f.
If the valves are bent, worn or if they stick, replace them and go to Step 6f.
Inspect the top of the cylinder.
If the machined surfaces are nicked or scratched, replace the compressor and go to Step 6f.
If the cylinder body is warped, replace the compressor and go to Step 6f.
If the cylinder is ok, go to Step 7.
If the valve plates and valves are ok, go to Step 6f.
Reassemble valve plates and head assembly.
Press the valve plates together.
Attach the compressor heads to the pulsation tank.
Install the valve plates and compressor heads. Torque the head screws to 400 inch lbs (4.61
Install the nozzle assembly and the air hose and go to Step 6g.
Recheck for air leaks.
If the nozzle pressure is 90 to 100 psi, the problem is solved.
If the nozzle pressure is less than 90 psi, go to Step 7.
Check the accuracy of the control panel pressure gage.
Disconnect the air hose from the hose fitting.
Remove the hose fitting from the pulsation tank.
Insert a test pressure gage into the pulsation tank and compare the control panel pressure gage.
If both gages read the same pressure, the control panel gage is ok.
If both gages read less than 90 psi, the piston rings are bad. Replace the compressor.