TM-9-2320-272-24-3

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4

JUNE 1998

TM-9-2320-272-24-3 - Page 616 of 799

4-182. REAR

TM 9-2320-272-24-3

6.

Remove cotter pin (1) and pin (8) from tensioner frame (2). Discard cotter pin (1).

7.

Remove grease fitting (7) from pin (8).

8.

Remove sheave (5), two thrust washers (3), and two felt washers (4) from tensioner frame (2).

Discard felt washers (4).

9.

Remove bearing (6) from sheave (5).

10.

Remove cotter pin (9) and pin (16) from tensioner frame (2). Discard cotter pin (9).

11.

Remove grease fitting (15) from pin (16).

12.

Remove sheave (13), two thrust washers (11), and two felt washers (12) from frame (2). Discard felt

washers (12).

13.

Remove bearing (14) from sheave (13).

14.

Remove frame (10) from tensioner frame (2).

1.

2.

3.

4.

5.

NOTE

Parts for both sheaves are inspected the same way.

Clean and inspect thrust washers (3) and (11) for cracks or wear. Measure thickness with a

micrometer and discard thrust washers (3) and (11) if thickness is less than 0.055 in. (1.40 mm) or if

cracked.

Clean and inspect bearings (6) and (14) for chips, cracks, scoring, or damaged cage. Discard if

chipped, cracked, scored, or cage is damaged.

Clean and inspect pins (8) and (16) for cracks or wear. Measure with a micrometer and discard if

outer diameter is less than 1.245 in. (31.63 mm) or if cracked.

NOTE

Refer to TM 9-237 for welding and straightening techniques.

Inspect sheave frame (10) for bends and cracks. Repair minor bends or cracks.

Clean and inspect tensioner frame (2) for bends, cracks, and broken welds. Repair minor bends,

cracks, and broken welds. Replace if not repairable.

4-880