TM-9-2320-272-23-2

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-2 - Page 1067 of 1417

ADJUSTMENT

1.

Check for proper belt tension by positioning belt tension gauge (Figure 1, Item 1) on drivebelt

(Figure

1,

Item

2) between pump housing (Figure 1, Item 5) and accessory drive pulley. New belt tension

should be 95

to

105

lb-ft (423 to 467 N·m). Used belt tension should be 90 to 95 lb-ft (378 to 422 N·m).

2.

Loosen six screws (Figure 1, Item 3) securing support bracket (Figure 1, Item 8) to engine (Figure 1, Item 7).

3.

Place brass drift punch (Figure 1, Item 6) against stud (Figure 1, Item 4) on water pump housing

(Figure 1, Item 5).

4.

Referring to values in Step (1), move stud (Figure 1, Item 4) clockwise facing pump housing (Figure 1, Item 5)

to tighten drivebelt (Figure 1, Item 2) tension. Move stud counterclockwise to loosen drivebelt tension.

5.

Tighten six screws (Figure 1, Item 3) securing support bracket (Figure 1, Item 8) to engine (Figure 1, Item 7).

6.

Recheck drivebelt (Figure 1, Item 2) tension. If drivebelt tension cannot be adjusted, replace

drivebelt.

TM 9-2320-272-23-2

0294

0294-2