TM-9-2320-272-10

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

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 408 of 481

TM 9-2320-272-10

3-59

3-14. RADIATOR FAN CLUTCH EMERGENCY SERVICE (Contd)

(2)

Raise and secure hood (paragraph 2-19).

(3)

Remove two clutch override lockup bolts (6) from storage boss on fan

clutch support bracket (5).

NOTE

Because fan clutch assembly is a moving part when engine is run-

ning, alignment mark may be located in different position from

position shown in illustration. Without starting engine, tap engine

ignition switch to move alignment mark to proper position.

(4)

Line up alignment mark on side of fan mounting plate (8) with alignment

mark on side of fan clutch assembly (7). Fan mounting plate (8) turns freely by

hand.

(5)

With alignment marks lined up, insert two clutch override lockup bolts (6)

into holes of fan mounting plate (8) and hand-tighten.

(6)

Tighten override lockup bolts (6) until fully seated to secure fan mounting

plate (8) to fan clutch assembly (7).

(7)

Close and secure hood (para. 2-19).

(8)

Start engine and allow engine to cool at idle speed until engine coolant

temperature drops to normal operating temperature range of 175°-195°F (79°-91°C).

(9)

Make certain unit maintenance is notified of emergency service performed

on vehicle.