TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 553 of 985

TM 9-2320-279-20-1

Cooling System Maintenance Instructions (Cont)

a. Removal.

NOTE

•Vehicles may have old or new model

valves. Model A valve must be

replaced by Model B or Model A

valve.

ŽModel B must be replaced by a

Model B valve.

ŽTag and mark air lines before removal.

(1)

Remove two air lines (1 and 2).

(2)

Remove two elbows (3).

(3)

Remove fan control valve (4) from

thermostat (5).

b. Installation.

WARNIN G

Adhesives, solvents, and sealing

compounds can burn easily, can give off

harmful vapors, and are harmful to skin

and clothing. To avoid injury or death,

keep away from open fire and use in

well-ventilated area. If adhesive,

solvent, or sealing compound gets on

skin or clothing, wash immediately with

soap and water.

(1)

Apply pipe thread sealing compound

to threads of fan control valve (4).

CAUTION

Do not tighten fan control valve by

placing wrench on housing or fan

control valve may be damaged.

(2)

Install fan control valve (4) in

thermostat (5).

(3)

Apply pipe thread sealing compound

to threads of elbows (3) and install

elbows.

(4)

Connect two air lines (1 and 2).

c. Follow-on Maintenance.

(1)

Fill cooling system (para 6-2).

(2)

Close engine cover

(TM 9-2320-279-10).

(3)

Start engine and build up air pressure

(TM 9-2320-279-10).

(4)

Check operation of fan control valve

(TM 9-2320-279-10).

(5)

Shut off engine (TM 9-2320-279-10).

END OF TASK

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