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 182 of 1275

TM9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

f.

TRANSMISSION AND DRIVING CONTROLS

The transmission is mechanically and hydraulically operated and is oil cooled. Power to operate the transmission is

delivered by the engine through the transfer assembly. See diagram below.

The transmission has 7 gears: 4 forward, 1 neutral, and 2 reverse. Once power is provided to the transmission, it delivers

this power to the left and right drive sprockets through an output shaft, universal joints, and the final drive assemblies.

The final drive assemblies reduce the transmission power and provides this reduced power to the sprockets and hubs.

The transmission also serves as the steering and braking mechanism for the vehicle.

3-82