Transmission Operation
- At the top left side of the selector, is the select display. On the left side of the display window, an LED character indicates which gear has been selected.
- At the top right side of the selector, is the monitor display. On the right side of the display window, an LED character indicates which gear is actually engaged.
- The Park (P) button shifts the transmission to Neutral (N) and engages the park pawl. When Park (P) is selected, the monitor side of the display window will show a letter P.
- Select the R button to place the transmission in Reverse ®). An R will appear on both sides of the display window.
- Select the N button to place the transmission in Neutral (N). An N will appear on both sides of the display window. The vehicle may be started in Neutral (N).
- Select the D button to place the transmission in Drive (D). The transmission will automatically shift through the full range of First (1) through Fifth (5) gears. When Drive (D) is first selected, the display will show D1, indicating that Drive (D) was selected and that First (1) gear is engaged. As the transmission automatically upshifts and downshifts, the display will show the gear currently engaged (D1, D2, D3, D4, or D5).
- With the transmission in Drive (D), select the downshift (down arrow) button to manually downshift one gear at a time, from Fifth (5) to First (1). The select display will show the selected gear and the monitor display will show the gear currently engaged. From D5 at the top of the Drive (D) range, the display will show 44, 33, 22, and 11 as progressively lower gears are manually selected.
- With the transmission in 11, 22, 33, or 44, select the upshift (up arrow) button to manually upshift one gear at a time until Drive (D) is selected. The select display will show the selected gear and the monitor display will show the gear currently engaged. From 11 at the bottom of the Drive (D) range, the display will show 22, 33, 44, and D5 as progressively higher gears are manually selected.
- The function of the mode button may vary from vehicle to vehicle. The label above the button identifies the function.
- A light in the upper right-hand corner of the mode button illuminates when the mode function is active.
- The service display illuminates if a fault is detected in the SBW system. Have a qualified technician inspect the SBW system as soon as possible.
- A flashing select/monitor display indicates that the transmission (and not the SBW system) has inhibited a selected transmission operation. See the Allison Transmission Operator's Manual for more information.
Warning: If the Park (P) position is selected and the letter P does not appear on the monitor side of the display window, you must set the parking brake. Otherwise the vehicle could move unexpectedly and cause an accident, possibly resulting in personal injury and property damage.
Note: Only the 1000/2200/2350 MH model transmissions have a park pawl and a Park (P) button.
Warning: Always place the transmission in the Park (P) or Neutral (N) position and set the parking brake before releasing the service brakes and exiting the vehicle. Otherwise the vehicle could move unexpectedly and cause an accident, possibly resulting in personal injury and property damage.
Warning: Do not leave the vehicle if the transmission is in Neutral (N) without first setting the parking brake. The vehicle could roll or move unexpectedly and cause an accident, possibly resulting in personal injury and property damage.
Note: The transmission will remain in the manually selected gear until Drive (D) is selected. Select Drive (D) at any time during the manual downshifting sequence (or upshift progressively to Drive (D) using the up arrow button) and the transmission will upshift and downshift automatically.
Note: The transmission will remain in the manually selected gear until Drive (D) is selected. Select Drive (D) at any time during the manual upshifting sequence and the transmission will upshift and downshift automatically.
Notice: To prevent transmission and axle damage, make sure the automatic transmission is in high range when performing an axle shift with the vehicle moving.