Drive Trainer / Automatic Transmissions
 

Allison MT Series Road Test Checklist

Neutral Start

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

Instruments

Contamination caused by not properly flushing the cooler
Flush the transmission cooler as part of the installation process

Parking Brake

Confirm proper function of the application and release of the parking brake (retarder models do not use a transmission mounted 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

Check and record the full-load governed speed of the engine
Subtract 200 from this speed and record that #, this is the desired speed for all automatic upshifts, EXCLUDING:
1-2 upshift in 640, 643, 654CR: should occur at full-load governed speed less 600 rpm
1-2 upshift in 650, 653: manual shift, no adjustment required
2-3 upshift for 650, 653: should occur at full -load governed speed less 600 rpm
While driving the vehicle check the wide-open throttle shift points. If adjustment is needed, refer to the respective MT service manual

Retarder

Confirm the retarder responds properly
Confirm the retarder enable switch turns off the retarder
Confirm the retarder only applies at closed throttle
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)
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.

Other Items

Perform a stall check
Confirm quality of shift