TM-9-2350-311-34-2 Maintenance Manual for Volume 2 M109 Cab Download
Page 184 of 552
TM 9-2350-311-34-2 5-6 BREECHBLOCK ASSEMBLY - CONTINUED b. Inspection and Repair 1 Inspect breechblock (1) for damaged threads. Repair threads or replace breechblock. 2 Measure breechblock (1) hole diameter (5). Replace if greater than 4.318 inches (10.968 cm). 3 Inspect gear segment (6) of breechblock (1). Replace breechblock if damaged or distorted. 4 Replace roller (4) if broken, cracked, if outside diameter is less than 0.995 inch (25.273 mm), or if inside di- ameter is greater than 0.506 inch (12.852 mm). 5 Inspect headed straight pin (3). Replace if damaged or distorted. 6 Deleted. c. Assembly NOTE If headed straight pin is new from supply, preform step 2. 1 Install roller (4) and headed straight pin (3) in breechblock (1). 2 Drill a 5/32 hole in the headed straight pin using the hole in the breechblock as a pilot hole. Ensure roller (4) is free to turn and not bound. 3 Install new spring pin (2). 5-40 Change 2