TM-9-2350-274-BD

M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED

TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

JANUARY 1984

TM-9-2350-274-BD - Page 110 of 219

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.

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