TM 9-2320-279-10-12-174 Change 8M977 Through M985 General Operating Procedures (Cont)2-11. DRIVE VEHICLE (CONT).l. Drive Up Steep Grades. Press and hold throttle treadle (1) all the waydown as vehicle moves up grade. Transmission will automatically downshiftgears as needed.m. Drive Down Steep Grades.CAUTIONSDo not allow speed to go above 2100 rpm whendriving downhill or damage to engine can result.SEngine brake operates best when engine speed isbetween 1650 and 2100 rpm. Transmission torqueconverter lockup valve may disengage below 1650rpm resulting in loss of engine power.(1)Set transmission range selector (2 or 2.1) to lower range as needed tokeep engine speed on tachometer (3) between 1650 and 2100 rpm.WARNINGDo not press service brake treadle hard three or fourtimes in a row. Air supply will be used up and servicebrakes will not work until air pressure is built up again.Loss of braking ability can result in serious personalinjury or death.(2)Use service brake (4) as needed to control vehicle speed.(3)Use engine brake as needed (para 2-11f).
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