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Here's a look inside the Ford HF-35 transmission and how it works!

This transmission was from a 2014 Ford Fusion with almost 300,000km on it. The transmission is an eCVT, meaning it pairs two electric motors in a parallel axis setup with a power split device. The planetary gearset connects the starter motor (MG1) to the internal combustion engine and the traction motor (MG2). MG2 is linked through a countergear that is always driving the wheels.

Common failures on these transmissions are the bearings for the supporting gears, axles and motor rotors going bad due to a lack of lubrication. If caught early, the transmission's wear points can be rebuilt before further damage to the motor's rotors and stators (as seen in this video) or the transmission casing are done.

A teardown video on the hybrid power inverter for this vehicle can be found here:


The engine teardown can be found here:


As a comparison, the 3rd generation Toyota Hybrid system videos can be found here:



Skip to section in this video:
0:00 Introduction
0:44 Teardown
9:48 Power Split Device
10:34 Transmission Demonstration
14:09 Failure Modes
15:26 Conclusion

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