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 114 of 799

TM 9-2320-272-24-3

4-63. WATER PUMP (M939/A1) MAINTENANCE

THIS TASK COVERS:

a. Disassembly

b. Cleaning and Inspection

c. Assembly

INITIAL SETUP:

APPLICABLE MODELS

M939/A1

REFERENCES (TM)

TM 9-214

TM 9-2320-272-24P

TOOLS

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

EQUIPMENT CONDITION

Mandrel (Appendix E, Item 116)

Water pump removed (para. 3-68).

Puller kit (Appendix E, Item 101)

Arbor press

GENERAL SAFETY INSTRUCTIONS

MATERIALS/PARTS

When cleaning with compressed air, wear eyeshields

and ensure source does not exceed 30 psi (207 kPa).

Two seals (Appendix D, Item 635)

Snapring (Appendix D, Item 660)

Relief fitting (Appendix D, Item 532)

GM grease (Appendix C, Item 28)

Liquid soap (Appendix C, Item 27)

a. Disassembly

1.

Using a gear puller, remove drive pulley (2) from shaft (1) on water pump body (3).

2.

Using a gear puller, remove water pump impeller (4) from shaft (1) on water pump body (3).

3.

Remove seal (5) from shaft (1). Discard seal (5).

4.

Remove snapring (7) from ring groove (8) inside bore (6). Discard snapring (7).

5.

Using two supporting wood blocks, place water pump body (3) on arbor press with bore (6) facing

down.

6.

Remove shaft. (1) by pressing on impeller end of shaft (1). Press shaft (1) out of bore (6).

7.

Position and clamp a mechanical wedge-type puller between grease grooves (9) on spacer (10) and

remove bearing (8) and spacer (10) from shaft (1).

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