TM-9-2320-344-10

TRUCK, CARGO, GUIDED MISSILE TRANSPORTER (GMT), 8X8, M985A4GMT

TECHNICAL MANUAL; OPERATOR'S MANUAL

OCTOBER 2008

TM-9-2320-344-10 - Page 563 of 1012

OPERATOR MAINTENANCE

OPERATE VEHICLE IN EXTREME HEAT

INITIAL SETUP:

Not Applicable

EXTREME HEAT OPERATION

CAUTION

•

When operating vehicle in very hot temperatures of above 100°F (38°

C), extra care must be taken to prevent overheating engine

(temperatures over 230°F (110°C) and transmission (temperatures

over 300°F, 149°C). Watch water and transmission temperature

gauges closely. Failure to comply may result in damage to

equipment.

•

Check oil levels often and keep operating strain as low as possible.

Vehicle cooling and lubrication systems support each other. Failure

of one system will rapidly cause failure of other systems.

NOTE

•

Close heater valves to improve the efficiency of cabin air

conditioning.

•

Closing the heater valves disables cabin heat.

1.

Keep operating temperatures as low as possible:

a.

Set transmission range selector (1) to N (neutral) while engine is running and not

required to move.

b.

Use low gear ranges only when necessary.

c.

Stop vehicle for cooling off periods, and idle engine as often as possible. Let engine

idle for approximately 3 minutes before shutting down. Idling will cool engine faster

than quick shutdown and may prevent damage from remaining engine heat.

d.

Check oil levels often. Oil seals are more likely to leak in extreme hot weather.

e.

Check air filter restriction indicator (2) frequently. If indicator shows red:

(1) Park vehicle. (WP 0052)

(2) Shut off engine. (WP 0053)

TM 9-2320-344-10

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