TM-9-2350-311-10
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; OPERATOR’S MANUAL
NOVEMBER 1994
TM-9-2350-311-10 - Page 61 of 775
TM 9–2350–311–10
1–23
1–14 EQUIPMENT OPERATION AND DESCRIPTION — CONTINUED
1–14.1
Powerplant — Continued
e.
TRANSMISSION. The transmission (5) is oil cooled and mechanically and hydraulically operated. It receives
power from the engine (2 or 3) through a geared power transfer assembly (4). The transmission has seven gears –
four forward, one neutral, and two reverse – and delivers power to the left and right drive sprockets through the
output shaft, universal joints, and final drives. It also functions as the steering and braking mechanism.
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