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Allison AT Series Road Test Checklist

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Allison AT Series Road Test Checklist

DT#36159

Neutral Start

  • Confirm the selector lever aligns with the mark indicating each range including N (Neutral) and P (Park)
  • Confirm proper function of neutral safety switch – starter should only operate when selector lever is in N or P

Instruments

  • Confirm proper function of all instruments associated with the transmission, including the speedometer & transmission oil temperature gauge

Parking Brake

  • Confirm proper function of the application and release of the parking brake
  • Confirm the brake is not dragging to heating up while released
  • Confirm the brake is fully applied before the lever reaches full travel

Power Takeoff (PTO)

  • Refer to the PTO owner’s manual or the vehicle’s manufacturer’s instructions to ensure proper function

No-Load Governed Speed

  • Confirm the no-load governed speed of the engine
  • If necessary, adjust the governor to meet the no-load governed speed (spec available through vehicle manufacturer

Shift Sequence

  • While driving the vehicle check the wide-open throttle shift points. If adjustment is needed refer to the respective AT service manual
    • 1-2 upshift occurs within 400 rpm of full load governed speed
    • 2-3 upshift occurs within 300 rpm of full load governed speed
    • 3-4 upshift occurs within 200 rpm of full load governed speed

Retarder

  • Confirm proper function at 50 percent to 100 percent apply
  • Confirm the retarder enable switch turns off the retarder
  • Confirm the retarder only applies at closed throttle
  • Confirm low speed cutoff switch turns off retarder in first range
  • Confirm the retarder temperature indicator increases rapidly when retarder is applied
  • Confirm the brake lights come on when retarder is applied

Transmission Fluid

  • Confirm correct fluid level in N (Neutral) and P (Park)
  • Confirm there are no leaks
  • Warm transmission and perform a “hot” fluid level check. Ensure vehicle is on a flat surface and transmission in N or P

Other Items

  • Perform a stall check
  • Confirm quality of shift