TM 5-4310-375-14
Table 3-2. Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. MOTOR STARTING AND STOPPING FREQUENTLY - Continued
Step 3. Pressure switch is not set properly. Observe the cut-in and cut-out air pressure readings on receiver tank
pressure gauge. The motor should start when pressure reads 175 psi (12.3 kgs/cm2), plus or minus 10 psi
(0.70 kg/cm2), and stop when pressure reads 200 psi (14.1 kgs/cm2), plus zero minus 10 psi (0.70 kg/cm2).
If pressure switch is not operating properly, notify Organizational Maintenance.
3. AIR DELlVERY DROPPING
Check for clogged air intake filter element.
Service the air intake filter as instructed in malfunction number 1.
4. UNIT KNOCKS OR RATTLES
Step 1. Check for loose or damaged belts or pulleys.
Notify Organizational Maintenance.
Step 2. Intake or exhaust valves leaking or air passages restricted.
Notify Organizational Maintenance.
Step 3. Check oil level as instructed in malfunction 1, step 2.
Service the air compressor in accordance with Corrective Action under malfunction 1, step 2.
5. COMPRESSOR RUNNING TOO HOT
Step 1. Check oil level.
Refer to Corrective Action under malfunction 1, step 2.
Step 2. Check for clogged air intake filter.
Refer to malfunction 1, step 1, and service the air intake filter.
Step 3. Check for obstructions that would block circulating air flow.
Remove any obstructions. Unit must be at least 2 feet (0.6 meters) from wall or any obstruction on
belt guard side.
Step 4. Check for accumulation of dirt or foreign material on compressor cooling fins.
3-5
