TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 243 of 1275

TM 9-2350-311-20-1

AIR CLEANER BLOWER MOTOR CIRCUIT

NOTE

Although air cleaner blower motor circuit differs slightly between M109A2, M109A3,

M109A4, and M109A5 Howitzers, the following troubleshooting procedure applies to

ail vehicles.

The air cleaner blower motor system consists of the blower motor, the air cleaner blower motor relay, air cleaner

generator system relay switch, neutral safety switch, circuit breakers, and associated wiring. The relationship of these

components is shown in the diagram below.

When the MASTER switch is turned ON, 24 Vdc is supplied to the air cleaner blower motors, MASTER relay, and circuit

breakers. The 24 Vdc from the circuit breaker goes to the air cleaner blower motors This allows the air cleaner blower

motor to be energized.

3-143