TM-9-2350-275-BD Battlefield Damage Assessment and Repair for M113 Family Download
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TM 9-2350-275-BD TRACK AND SUSPENSION SECTION III. Drive Sprocket and Roadwheels 8-6. DRIVE SPROCKET OR HUB BOLTS SHEARED General Information Loosening of bolts which hold the drive sprocket carrier to the final drive output hub may cause the bolts to be sheared. Operation may continue with as few as five (5) bolts remaining, provided that they are equally spaced around the hub. If the hub is welded or less than a full set of bolts is used, do not use pivot steer. The side stresses may cause the sprocket to shear again. The drive sprockets can also be remounted using this same procedure. Limitations: ● Degraded mobility Personnel/Time Required: ● 2 soldiers ● 1-2 hours Materials/Tool: ● Arc welder ● 5/8 in x 1-3/4 in cap screws ● Use bolts from the opposite Procedural Steps: 1. Attempt to remove the sheared bolt. 2. If four or less bolts remain, or if three or more consecutive bolts are missing due to damaged bolt holes, weld the sprocket wheel to the final drive output hub. 3. Adjust track tension. 4. Record the BDAR action taken. When the mission is completed, as soon as practicable, repair the vehicle using standard maintenance procedures. 8-7