CHECK AIR COMPRESSOR PRESSURE SWITCH.

TM 3-1040-279-12&P

4-37 CHECK AIR COMPRESSOR PRESSURE SWITCH.

This task covers measuring air pressure in pressure tank.

INITIAL SETUP

Tools

General Mechanic's Automotive Tool Kit

SC 5180-90-CL-N26

Test Equipment

Air pressure test gage (Fig. G-22, App G)

1. Drain air out of pressure tank through control valve (1).

2. Remove cap (2) on tee (3).

3. Attach pressure gage (Fig. G-22, App G) to tee.

4. Set circuit breaker CB1 to ON.

5. Set POWER switch to ON.

6. Allow air compressor to run.

7. Pressure gage should indicate 63 3 psig when air compressor stops running. If the reading is not

63 3 psig, replace pressure switch.

8. Set POWER switch to OFF.

9. Set circuit breaker CB1 to OFF.

10. Drain air from pressure tank through control valve (1).

11. Remove pressure gage from tee (3) and install cap (2) on tee (3).