TM 5-4310-451-14
Table 4-2. Mechanical Troubleshooting (Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2
Check for defective blowdown valve diaphragm.
Replace blowdown valve (see paragraph 4-88).
11.
EXCESSIVE OIL IN DISCHARGE LINE.
Check for oil carry-over into discharge line.
Replace oil separator element (see paragraph 4-90).
12.
AIR DISCHARGE PRESSURE TOO LOW.
Step 1
Check blowdown valve for leaks.
Tighten or replace blowdown valve (see paragraph 4-88).
Step 2
Check pressure regulating valve for leaks.
Tighten or replace pressure regulating valve (see paragraph 4-87).
Step 3
Check pressure regulating valve adjustment.
Adjust pressure regulating valve (see paragraph 2-11).
Step 4
Check for damaged oil separator element.
Replace oil separator element (see paragraph 4-90).
13.
EXCESSIVE OIL CONSUMPTION.
Step 1
Check for defective blowdown valve.
Replace blowdown valve (see paragraph 4-88).
Step 2
Check for damaged oil separator element or oil carry-over into discharge line.
Replace oil separator element (see paragraph 4-90).
14.
UNIT WILL NOT UNLOAD.
Step 1
Check for blocked regulating valve inlet.
Remove and clean pressure regulating valve (see paragraph 4-87).
Step 2
Check pressure regulating valve adjustment.
Perform pressure regulating valve adjustment (see paragraph 2-11).
Step 3
Check for defective blowdown valve.
Replace blowdown valve (see paragraph 4-88).
4-11
