TM 5-4940-228-14
Table 5-1. Direct and General Support Troubleshooting (continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check unloader pistons for binding or contamination.
Unloader cover will have to be removed (Fig 9-2).
Replace unloader assembly.
7. Compressor cannot reach 65 psi operating pressure.
Step 1.
Check belt tension.
Remove belt guard and deflect
belts; proper adjustment is 3/8 to 5/8 (1 to 1.5 cm)
inches at center of belt when depressed with your thumb
with moderate pressure (about 20 lbs) (9 kg).
Step 2.
Check engine rpm.
Proper rpm is 3600.
Refer to TM 5-2805-257-14 for engine troubleshooting.
Step 3.
Remove heads and check reed valves for damage (Chapter 9).
Step 4.
Remove cylinders; check for broken or stuck rings on
pistons and excessive wear of cylinders (Chapter 9).
8. Compressor excessive oil consumption.
Step 1.
Check oil for proper grade. (See Lubrication Order)
Step 2.
Check rings and cylinders for excessive wear
(Chapter 9).
Replace piston rings.
5-3
