TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
Page 54 of 828
TM 9–2350–311–20–2 1–23 Cross-level adjustment ±334 mils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Incremental reading (counters) 1 mil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M42 Tank Periscope: Height 10–1/4 in. (5.51 cm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weight 8 lb (3.363 kg) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Length 5–1/2 in. (13.97 cm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Width 5 in. (12.7 cm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–17 EQUIPMENT CONFIGURATION Not applicable. Section III. PRINCIPLES OF OPERATION The purpose of Section III is to familiarize the mechanic with the basic operating capabilities of the howitzer cab. The systems covered in this section are the armament, fire control, elevating and traversing systems, NBC system, and related components. This section will provide information needed to understand instructions on how to service, test, and maintain the cab sys- tems. The functions of each system are presented separately. However, information is also given on how the different cab systems work together so that the mechanic can understand equipment operation. Separate explanations are given for cab systems which require both electrical and hydraulic power to operate. Functional diagrams are included to show how the components of each cab system work together. 1–18 EQUIPMENT OPERATION AND DESCRIPTION 1–18.1 Mount and Howitzer Assembly A 155 mm cannon assembly is the primary armament for the M109 series howitzer. M185 cannon assembly is used on M109A2/M109A3/M109A4 howitzers. M284 cannon assembly is used on M109A5 howitzers (para 1–15). THRUST COLLAR MUZZLE BRAKE CANNON TUBE BORE EVACUATOR DUST SHIELD UPPER GUN ROTOR MOUNT ASSEMBLY LOWER GUN SHIELD RECUPERATOR BEARING BALLS