Allison Transmission determines whether a power complaint is engine or transmission related.Stall Speed – max engine rpm attainable at full throttle, turbine stopped or “stalled.”Use as a troubleshooting procedure only.
Stall Test
Determines whether a power complaint is engine or transmission related.Stall Speed – max engine rpm attainable at full throttle, turbine stopped or “stalled.”Use as a troubleshooting procedure only.Stall Test PreparationCheck and adjust transmission fluid level.Check engine fuel control linkage for proper operation.Check air induction system.Verify smoke controls are functioning properly.Install a tachometer (don’t rely on vehicle tach).Install temp gauge in converter out line.Chock vehicle wheels.Warm sump to normal (160 – 200 degrees F).All accessories off
Vehicle repair guide
Stall Test Cautions
Keep all people clear – away from front, rear or side of vehicle.Never stall test in Reverse or Low (seven-speed models).Never stall longer than 30 seconds without a cool down.Do not allow converter out temp to exceed 300 degrees F.
Stall Test Procedures
Set park brake.Start engine.Apply service brake.Select Drive.Slowly accelerate while holding service brake.Record max engine rpm when tach levels.Slowly release throttle.Select Neutral.Cool down by running engine 1200-1500 rpm.
Stall Test
Using the ProLink™ or DOC™Use the ProLink™ or DOC™ to select a specific range.With the engine running, park brake and service brake applied, choose Clutch Test Modeunder Action Requests.Place the selector in the desired range (4this best).Slowly accelerate to full throttle then record max rpm.Slowly release throttle.Select Neutral.Cool down by running engine 1200-1500 rpm.
Stall Testing
Smoke Controlled EnginesSmoke controls and throttle delay mechanisms inhibit engine acceleration.May require stall testing with the vehicle moving.Locate an isolated area.Select a range that limits road speed (2ndor 3rdis best – not Low).Operate at full throttle, max governed rpm.Slowly apply service brakes while staying at full throttle.Record engine rpm when the vehicle comes to a stop.
2019 Allison DOC Transmission+GEN5 Diagnostic Software Installation Service
