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TM 9-2320-270-10
USING TRANSMISSION GEAR RANGES AND COMBINATIONS - CONTINUED
Auxiliary Transmission. For extreme load and grade conditions and for off-highway operation,
you can get additional low gear range by shifting the auxiliary transmission selector (2) to low
range.
When you need low range, always use the following procedure for shifting the auxiliary
transmission.
1.
2.
3.
4.
5.
CAUTION
Never move the lock lever of the transfer case to LOCK when driving on a hard
surface.
Never shift the auxiliary transmission while the M911 Truck Tractor is moving.
This can cause damage to transmission and/or drive train. Whenever you move
the lock lever to LOCK, you must shift the auxiliary transmission to low.
Stop Truck
Engine speed. IDLE
Main Transmission selector Iever- (N) neutral position.
Auxiliary transmission shift lever - LOW RANGE
Main transmission selector lever -1 (1st gear hold) position, or other ranges as needed.
NOTE
LoW range auxiliary and 1 position main transmission combination gives the most
pulling power, engine braking, and hydraulic retarder effect you can get.
You get the most pulling power in each main transmission range selection when
the auxiliary transmission is in low range.
You can upshift or downshift main transmission while the M911 Truck Tractor
is moving (even at full throttle) whether the auxiliary transmission is in high or
low range.
T A 2 2 0 8 5 0
2-77
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