TM 5-4310-369-14
Table 5-2. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
PNEUMATIC EQUIPMENT
1. COMPRESSOR FAILS TO PUMP TO PRESSURE.
Step 1. Check to see if belts are improperly adjusted.
Adjust or replace belts. Refer to paragraph 4-13.
Step 2. Check for broken valve or valve spring in high pressure head.
Remove cylinder head and replace defective parts. Refer to paragraph 5-10.
Step 3. Check for broken reed valve in low pressure heads.
Remove cylinder heads and replace defective parts.
2. COMPRESSOR KNOCKS.
Step 1. Check for loose flywheel pulley.
Tighten flywheel setscrew. Refer to paragraph 4-15.
Step 2. Check for broken valve or valve spring in high pressure head.
Remove cylinder head and replace defective parts. Refer to paragraph 5-10.
Step 3. Check for broken reed valve in low pressure heads.
Remove heads and replace defective parts.
Tighten connecting rod bolts or replace connecting rod. Refer to paragraph 5-11.
3. COMPRESSED AIR CONTAINS OIL.
Step 1. Check for worn piston or piston rings.
Replace piston or piston rings. Refer to paragraph 5-11.
Step 2. Check for worn or scored cylinder bore.
Replace cylinder. Refer to paragraph 5-11.
Section IV. MAINTENANCE OF FUEL SYSTEM
General
Refer to Chapter 4 for maintenance of fuel system.
Section V. MAINTENANCE OF THE ENGINE ASSEMBLY
Refer to TM 5-2805-256-14 for Engine maintenance
procedures.
Section VI. MAINTENANCE OF PNEUMATIC EQUIPMENT
General
Cylinder Heads (Low Pressure)
The compressor is a two-stage, three-cylinder, air cooled
a. Removal.
(1) Remove intercooler tube (7).
unit. There are two low-pressure cylinders and one high-
pressure cylinder operating on a common crankshaft. The
(2) Remove filter rain caps.
major repair instructions are those covering replacement of
(3) Remove cylinder head bolts (21).
the cylinder heads, valves, pistons and rings, connecting
rods, crankshaft, cylinders and crankcase.
and air filters (18, 19).
