TM-9-2320-387-10

TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113

OPERATOR’S MANUAL

OCTOBER 2001

CHANGE 1

TM-9-2320-387-10 - Page 159 of 277

TM 9-2320-387-10

Change 1

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c. During Operation.

CAUTION

Avoid continuous vehicle operation at high speeds. Avoid long, hard

pulls on steep grades with transfer case shift lever in L (low range)

position. Damage to transfer case will result.

(1)

Frequently check coolant temperature gauge (2) and oil pressure

gauge (1). Engine is overheating if one or more of the following conditions exist:

(a)

Engine coolant temperature is more than approximately 230°F (110°C)

as indicated by temperature gauge (2).

(b)

Engine oil pressure drops below approximately 15 psi (103 kPa) with

engine under a load.

(c)

Engine oil pressure drops below approximately 6 psi (41 kPa) with

engine at idle.

(2)

If engine overheating occurs:

(a)

Park vehicle, allowing engine to idle.

(b)

Observe coolant temperature gauge (2) for steady cooling.

CAUTION

• Stop engine if coolant temperature gauge suddenly increases

beyond approximately 230°F (110°C). Failure to comply will result

in damage to engine.

• Notify unit maintenance to check differentials, transfer case, and

transmission fluids for “oil breakdown” caused by overheating.

(c)

If engine coolant temperature continues to increase or does not lower,

stop engine. Perform troubleshooting procedures in table 3-1.

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