TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
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PAR 72 PRELIMINARY INSTRUCTIONS FOR CHAP 5, SEC I POWER TRAIN OVERHAUL i. Threaded Parts (1) Inspect all threaded parts for stripped or damaged threads and burrs. (2) Replace all parts which have stripped threads or damage which cannot be repaired by chasing the threads with a tap or die of the proper size. Note. Chase threads with a used tap or die. A new tap may cut oversize, while a new die may cut undersize. j. Snap Rings. Inspect snap rings for nicks, burrs, distortion and wear. Discard defective snap rings. k. Springs. Inspect springs for wear, distortion, breaks, evidence of overheat- ing, and loss of tension or compression. Discard defective springs. l. Shafts and Spindles (1) Inspect shafts and spindles for excessive wear, bending, scores, cracks, burrs and obstructed oil passages. (2) Remove burrs and minor sur- face irregularities with crocus cloth or a soft honing stone. Remove obstructions by probing with soft wire or with com- pressed air. Discard defective parts. m. Ball-type Valves (1) Inspect balls for rust, pitting or grooving. Discard balls which will not seat properly. (2) Inspect ball seats for wear and pitting. Reseat by lapping with the proper size ball. Discard parts in which the seat cannot be restored. n. Spool-type Valves (1) Inspect valves for wear, burrs, scoring and evidence of sticking. Try valves in their bores. All valves should move in their bores by their weight alone. Do not force valves. Change 2 76.1/(76.2 blank)