TM-9-2350-274-BD M109 Battlefield Damage Assessment and Repair Download
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TM 9-2350-274-BD POWERTRAIN/STEERING SECTION IV. Final Drive 7-7. FINAL DRIVE HUB BOLTS SHEARED General Information Final drive mounting bolts will work loose during normal operation. If they are not noticed and retightened, the shifting of the sprocket hub will shear the bolts. Bolts can be cannibalized from the good side to enable the mounting of the sprocket hub. If the hub is remounted with a reduced number of bolts, the bolts should be spaced evenly. At least 4 of the 8 mounting bolts are required to remount the hub. Limitations: ● Reduced mobility Personnel/Time Required: ● 2 soldiers ● 1-2 hours Materials/Tools: ● Vice-grips ● Hammer ● Chisel Other Options: ● Weld the hub assembly to the output of the final drive. Procedural Steps: 1. Break track. 2. Remove broken final drive housing bolts. 3. Remount the hub with replacement or remaining bolts (minimum of four). 4. Reconnect track and adjust tension. 5. Record the BDAR action taken. When mission is completed, as soon as practicable, repair the vehicle using standard maintenance procedure. 7-7/(7-8 blank)