TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
Page 87 of 828
TM 9–2350–311–20–2 2–26 Table 2-2. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF- PROPELLED HOWITZER – CONTINUED Location Item No. Not Fully Mission Capable if: Procedure Item to Check/Service Interval 6 Quarterly Breech Operating Cam Check and adjust (para 5–12). 7 Quarterly Buffer Counter Recoil Assembly Prior to returning cannon tube to battery, perform buffer inspection (para 5–17). 8 Quarterly Breech Assembly a. Breechblock: Check for cracks, ruined/ damaged locking threads and ease/ smoothness of operation. b. Firing Block Assembly: Check for rust deterioration of firing pin, and condi- tion of firing block. c. Obturator: Check for correct alinement of front and rear split ring, corrosion/ deterioration/pitting of rings/assembly. 9 Annually Contact Arm Assembly and Cab Electrical Cable and Brushes Clean and adjust (para 9–3). 10 Annually Main Accumulator Perform zero pressure check (para 6–10). 11 Annually Cab Traversing Mechanism Perform cab traverse check as follows: (Chapter 11): a. Position vehicle on level ground. b. Press button (1) to release pin. c. Release cannon travel lock (2) and cab traverse lock (3). 1 3 2