TM-9-2320-272-24-1

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998

TM-9-2320-272-24-1 - Page 560 of 1015

TM 9-2320-272-24-1

THIS TASK COVERS:

a. Adjustment

b. Removal

c. Inspection

d. Installation

APPLICABLE MODELS

M939/A1

TOOLS

REFERENCES (TM)

TM 9-2320-2722-10

TM 9-2320-2722-24P

General mechanic’s tool kit (Appendix E, Item 1)

Belt tension gauge (Appendix E, Item 16)

MATERIALS/PARTS

Three lockwashers (Appendix D, Item 350)

EQUIPMENT CONDITION

Parking brake set (TM 9-2320-272-10).

Hood raised and secured (TM 9-2320-272-10).

Bight splash shield removed (TM 9-2320-272-10).

Fan drivebelts removed (para. 3-70).

Power steering pump drivebelts removed

(para. 3-230).

1.

Check for proper belt tension by positioning belt tension gauge on drivebelt (1) between pump

housing (6) and accessory drive pulley (2). New belt tension should be 95-105 lb-ft (423-467 N•m).

Used belt tension should be 90-95 lb-ft (378-422 N•m).

2.

Loosen six screws (4) securing support bracket (3) to engine (7).

3.

Place brass drift punch against stud (5) on water pump housing (6).

4.

Referring to values in step 1, move stud (5) clockwise facing pump housing (6) to tighten drivebelt (1)

tension. Move stud (6) counterclockwise to loosen drivebelt (1) tension.

5.

Tighten six screws (4) securing support bracket (3) to engine (7).

6.

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

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