General Information
Note: The information provided in this chapter is specific to the front-engine diesel chassis, however, other chapters in this manual pertain to the front-engine operated vehicle. These include, but are not limited to, the controls and pretrip inspection and daily maintenance chapters.
Notice: Do not allow the vehicle to coast in neutral. This can result in severe transmission damage. Also, no engine braking is available.
Notice: The engine should never be operated for more than 30 seconds at full throttle with the transmission in gear and the output stalled. Prolonged operation of this type will overheat the transmission fluid and will result in severe damage to the transmission.
The Arens shift-by-wire (SBW) push-button shift selector is part of an electronic shift control system used with Allison series 1000/2200/2350/2500 5-speed automatic transmissions. An electronic actuator is mounted on the transmission.
The 1000/2200/2350/2500 series transmission has a park pawl and the SBW selector has a Park (P) position. The 2500 series transmission has a park brake (Pb) button. See Fig. and see Fig..
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SBW Shift Selector
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Drive (D) Button
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Neutral (N) Button
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Reverse ®) Button
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Park (P) Button
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Select Display
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Select/Monitor Display Window
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Monitor Display
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Service Display
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Mode Function Label
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Mode Light
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Mode Button
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Upshift Button
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Downshift Button
Fig. 1, SBW Shift Selector (1000/2200/2350 series)
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Shift Selector
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Drive (D) Button
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Neutral (N) Button
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Reverse ®) Button
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Park Brake (Pb) Button
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Select Display
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Select/Monitor Display Window
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Monitor Display
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Service Display
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Mode Function Label
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Mode Light
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Mode Button
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Upshift Button
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Downshift Button
Fig. 2, SBW Pushbutton Shift Selector with Park Brake (Pb) Button (2500 series)
In case the vehicle needs to be towed and the SBW system cannot be activated to move the transmission out of Park (P), a manual procedure is provided to shift the transmission. At the actuator, on the transmission, a port is provided to insert an Allen wrench to shift the transmission manually.