Drive Trainer Knowledge Base
Drive Trainer / Automatic Transmissions
 

Allison 3000/4000 Series Road Test Checklist

DT#12921

Drivability - Verifying proper transmission & support equipment install & operation

Approved fluid to be filled to appropriate level


Starting the vehicle to confirm proper response during start up:

Turn the master/ignition switch on - do not start vehicle
Confirm “CHECK TRANS” light comes on
Start the vehicle
Confirm “CHECK TRANS” light shuts off
Confirm “N” is displayed in the shift selector


Trouble Codes - Prior to vehicle run

Identify false codes that may have been stored in the electronic controls’ ECU
Clear these codes by performing a re-learn (see Drive-Trainer.com’s Flush and Flash video)


Road Test Vehicle - Allow electronic control to converge shifts

Confirm vehicle only starts in Neutral
Confirm CHECK TRANS light is functioning properly
Confirm shift selector display is functioning properly
Confirm proper function of transmission fluid pressure gauge (if applicable)
Confirm speedometer is functioning properly
Confirm temperature gauge is functioning properly (if applicable)
Confirm reverse warning system is functioning properly (if applicable)
Confirm transmission fluid level meets specifications (cold, neutral, level)
Confirm transmission fluid is not leaking
Confirm correct no-load governed speed of engine
Adjust governor as needed (refer to mfg’s specs for engine-transmission)
Confirm proper function of PTO (if applicable) - refer to PTO’s owner manual
Confirm smoothness of transmission upshifts and downshifts through all ranges
Perform stall test
Confirm quality of shift


Proper Operation

Confirm all components have proper mounting and operation
Confirm there are no transmission fluid leaks at:
        Gaskets
        Surfaces
        Lines
        Hoses


Trouble Codes - After vehicle run

Review electronic control’s ECU for existing fault codes after the road test
Troubleshoot and correct any problems found


Service & Maintenance

For detailed service & maintenance instructions refer to the current issue of Allison’s service manual
For detailed electronic control system troubleshooting for to the current issue of Alison’s WTEC III