TM-9-2320-273-10
TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; OPERATOR’S MANUAL
DECEMBER 2012
TM-9-2320-273-10 - Page 123 of 452
Table 18. Range Selector Control M915A1 - Continued.
Key
Control/Indicator
Function
Transmission Range
Selector Control
(M915A1)
To operate the selector control, apply service brakes,
release parking brakes, depress push button, and move
selector lever until gear range indicator is aligned with
the desired gear position on the gear range dial.
Automatic upshift and downshift points are influenced by
the pressure of your foot on the accelerator pedal. For
example, when the accelerator pedal is fully depressed,
the transmission will automatically upshift near the
governed speed of the engine (2,100 rpm). A partially
depressed accelerator pedal will cause upshifts to occur at
a lower engine speed.
In all forward gear ranges, the vehicle will start in first
gear and automatically upshift to the highest gear shown
in the gear range selected. For example, in gear range
1-5, the vehicle will start in first gear and upshift
automatically through second gear, third gear, fourth
gear, and fifth gear. If gear range 1-3 is selected, the
transmission will automatically upshift from first gear
through second gear, and into third gear. It will not
upshift beyond third gear until the selector lever is
manually moved to a higher gear range.
Manual downshifts, performed by depressing the push
button and moving the selector lever, should be avoided
when the vehicle is above the maximum speed obtainable
in the next lower gear. If a downshift or shift to
REVERSE (R) is made at too high a speed, the
transmission hydraulic system automatically prevents the
shift from taking place until a safe lower speed is
reached.
Normally, service brakes and the engine retarder should
be used, as needed, to slow the vehicle to an acceptable
speed where the transmission may be downshifted.
TM 9-2320-273-10
0005
0005-25
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