Mack or Kw
Discussion in 'Trucks [ Eighteen Wheelers ]' started by trk3, Sep 30, 2011.
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Your statement is not that acurate. While Eaton does have a TCM (Transmission control module) it does communicate with the engine throught the datalink (J1939) to the engine to help make shifts smoother. Each engine manufacture that uses an Eaton has to get that engine transmission certified by Eaton before eaton will give the ok to release it. There is a lot of fine tuning of the engine's parameters to help make the shifts as smooth as possible. Many hours are spent at Eatons test facility in Marshall Michigan to certify the engine to trans specs (which means a lot of going up and down hills and going in circles at their test track.)
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Eaton even replaced the x-y controller and all the wiring. Still did not work well and they told me it was the "best we can do as our computers do not read every sensor the engine has"
This was a 2005 IH 9400i with a C15 ACERT motor. -
So far I'm impressed to say the least.SHC and The Challenger Thank this. -
European transmissions are based on synchro manuals and that's why when any European TCU cant shift smoothly it applies clutch. any who have truck with ZF Astronic (yep, peterbilt is usually with ZF) ore any I-shift/M-drive owner can feel how smooth are transmissions comparing with Ultrashift ore Autoshift.
But TCU controlled clutch is the weak point of European transmissions. Clutch release bearings life is shorter becouse TCU applies clutch, and bad bearing throwing balls may damage too many things inside bellhousing that's why it is recomended to inspect clutch parts avery time you drop tranny and change any part you sugest badSHC Thanks this. -
i know one case that fork failure destroy gearbox
also man have very aggressive clutchwork so it require repairing very often -
The Challenger and SHC Thank this.
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I drove it all of 30 miles so I'm not going to base an opinion on that so I look forward to your write up.The Challenger Thanks this. -
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