TM-9-2320-272-24-2

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4

JUNE 1998

TM-9-2320-272-24-2 - Page 886 of 991

4-29. WATER

TM 9-2320-272-24-2

1.

2.

3.

4.

5.

6.

7.

8.

WARNING

Eyeshields must be worn when cleaning with compressed air.

Compressed air source will not exceed 30 psi (207 kPa). Failure

to do so may result in injury to personnel.

CAUTION

Rotate bearings very slowly while cleaning. Do not spin bearing races

with compressor air when drying bearings. Serious damage will result.

NOTE

Do not service bearings in dirty surroundings.

Clean bearings (4) and (5), water pump body (6), shaft (3), and water pump impeller (8) (para. 2-14 and

TM 9-214).

Clean gasket remains from water pump support (2) mating surfaces and engine block (1).

Inspect bearings (4) and (5) (para. 2-15). See TM 9-214 for additional inspection standards.

Check bearings (4) and (5) for heat discoloration, pits, scored ball or rollers, breaks, cracks, splits,

dents, rust, or corrosion. Replace bearings (4) and/or (5) if any of these defects are noted.

Inspect spacer (7) for cracks and galls. Replace spacer (7) if cracked or galled.

Inspect water pump impeller (8) for cracks and heavy corrosion. Replace if cracked. Clean with wire’

brush if corroded.

Inspect shaft (3) for cracks, scores, and galls. Replace shaft (3) if cracked, scored, or galled.

Inspect water pump body (6) for cracks, pits, and heavy corrosion. Replace water pump body (6) if

cracked, pitted, or corroded.

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