TM 9-2320-289-10.pdf

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1-13. TRANSFER CASE
TM 9-2320-289-10
DO NOT race engine when shifting from “P” (Park) or “N” (Neutral) into another gear
range.
DO NOT shift between forward ranges and “R” (Reverse) while operating engine at
high speed or heavy throttle.
DO NOT force transmission gearshift lever.
DO NOT operate transmission at or near “stall condition” for more than 10 seconds
at a time. (“’Stall condition” is when the engine is running at high speed while the
transmission is in a driving range and drive wheels aren’t moving, such as when the
truck is stuck in deep sand, mud, deep snow, or when truck is against a fixed barrier.)
DO NOT shift transmission gearshift lever to “P” (Park) on a hill before setting parking
brake. This puts force on the transmission and makes it difficult to shift the
transmission gearshift lever out of “P” (Park). Make sure the transfer case is in gear.
When preparing to drive, DO NOT release parking brake until transmission gearshift
.lever
is shifted out of (Park) position.
a. All trucks, except the M1028A1, M1028A2, and M1031, are equipped with a New Process
Model 208 transfer case. The M1028A1, M1028A2, and M1031 are equipped with New Process
Model 205 transfer case which is designed to accommodate installation of a power take-off unit.
(A power take-off unit uses engine power to run equipment.)
b. The transfer case transmits engine power to front axle for four-wheel drive operation.
Four-wheel drive is used to provide additional traction and lower gearing for use in off-road
operations and to provide low speed pulling power in unusual conditions.
c. The four transfer case control lever positions are:
(1) “N” (Neutral). In this position, both front and rear axles are not engaged. Power from
engine will not turn wheels.
(2) “2H” (Two-wheel Drive High Range). This position is used for normal, two-wheel
driving on dry, primary and secondary roads at normal highway driving speeds.
(3) “4L” (Four-wheel Drive Low Range). This position is used for driving under unusual
conditions in LOW speed ranges.
(4) “4H” (Four-wheel Drive High Range). This position is used for driving under unusual
conditions in HIGH speed ranges.
M1028A1, M1028A2, and M1031 All Other
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