TM 9-2320-387-10
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 250F (120C)
as indicated by temperature gauge (2) and/or overheat lamp illuminates.
(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.
1
2
(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 250F (120C) and/or overheat lamp
illuminates. 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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