TM 5-4310-452-14
Table 4-2. Mechanical Troubleshooting Procedures (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Check for defective minimum pressure and service valve.
Repair or replace minimum pressure and service valve (see paragraph 4-100).
Step 4. Check to see if unit was shut down improperly,
Instruct operator on correct shutdown procedure.
3. AIR DISCHARGE PRESSURE TOO LOW.
Step 1. Check to see if engine speed is too low.
Adjust throttle control (see paragraph 4-25).
Step 2. Check to see if air silencer is restricted or mesh is damaged or missing.
Clean or replace air silencer as necessary (see paragraph 4-94).
Step 3. Check blowdown valve for leaks.
Tighten or replace blowdown valve (see paragraph 4-95).
Step 4. Check regulating valve for leaks.
Tighten or replace regulating valve (see paragraph 4-94).
4. COMPRESSOR AIR UNSUITABLE FOR SANDBLASTING (EXCESSIVE OIL IN AIR OUTLET).
Step 1. Check for excessive oil in air lines.
Replace oil separator filter element (see paragraph 4-87).
Step 2. Check for clogged oil scavenger line.
Remove and clean oil scavenger line (see paragraph 4-86).
Step 3. Check for defective minimum pressure and service valve.
Repair minimum pressure and service valve (see paragraph 4-100).
5. OIL CONSUMPTION TOO HIGH.
Check for excessive oil carryover.
Refer to Malfunction 2, EXCESSIVE OIL CARRYOVER.
6. OIL BLOWS BACK INTO COMPRESSOR AIR CLEANER.
Check for damaged or defective unloader valve assembly.
Replace unloader valve assembly (see paragraph 4-90).
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