ZF 9hp48 Theory of Operation

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3 жыл бұрын

In this action packed 2 hour long video, I cover the theory of operation of the ZF 9HP 48 transaxle. You'll learn it's applications, service procedures, TSBs, Solenoid and clutch application, electronic control, powerflow, gearset layout and connections, and rebuilding particulars (things to watch out for). This video is part of an Automatic Transmissions course at SIU. Students watch these videos to compliment what they learn in lab when they overhaul these transmissions.

Пікірлер: 43

@ConcreteJungleGames 3 ай бұрын

Incredibly valuable presentation. Thank you for sharing this.

@andrejzupevc8305 3 ай бұрын

Thank you for sharing your knowledge. Respect.

@maxnguyen22 Жыл бұрын

Amazing info. Thank so much for your time.

@YasharJanati-xm5lc 6 ай бұрын

Thanks man 🙏

@michaelstapleford512 4 ай бұрын

At 56:17, I think the E-clutch at the front of the trans (left side of screen) is mis-labeled as the B-clutch.

@Sweaty__Palms 2 жыл бұрын

Hi, I've got a question -what happens when it shifts from 3rd to 4 gear? I always hear a kind of scratching sound when it shifts 3 to 4. What should I check first? Thank you!

@zroger73 3 жыл бұрын

You stated that the dog clutches use proportional control, but the symbols indicate that their solenoids are either on or off. The drawing makes more sense since unlike the friction clutches, the dog clutches are either engaged or disengaged with no state in between.

@siuautomotive 3 жыл бұрын

Yes, proportional meaning electrically on/hydraulically on. Not inversely proportional which is electrically on/hydraulically off.

@zroger73 3 жыл бұрын

@@siuautomotive, the terms for those characteristics are "normally-closed" and "normally-open", respectively. The term "proportional" means the valve can vary its position from on to off or anywhere in between based on the amount of current applied to the solenoid using pulse-width modulation. The solenoids that are used to operate the dog clutches are either energized or de-energized - they don't use proportional control. :)

@siuautomotive 3 жыл бұрын

Ah, good point!

@barbrolidman5603 2 жыл бұрын

Does anyone on this blog know if the transmission case design is identical between various applications? That is, it would permit any offered gearset/internal components to be installed as a full set peculiar to a desired make/model vehicle application into any empty case.

@sbond1963 Жыл бұрын

Regarding the FCA transmission and 140 mm dipstick. Are you checking with the engine running like historical transmission fluid checks?

@JCT-AUTO Жыл бұрын

Thank

@thekevinman66 7 ай бұрын

So even though the oil service between FCA and Honda is different, could you service Honda like a FCA and vise versa and be fine?

@Red_Ford 6 ай бұрын

Anyone have experience with that AT in Fiat 500X. I'm going to buy this car with petrol engine 2.4 Tigershark but opinions about this combination (engine/AT) made me a little bit confused.

@zroger73 3 жыл бұрын

Could the reason for the difference in D clutch application in park/neutral have to do with some of these transmissions starting in 2nd gear (i.e. newer Hondas) by default?

@siuautomotive 3 жыл бұрын

Hmmm, possibly. I didn’t know the Honda units start in 2nd at times. Thanks for letting me know!

@zroger73 3 жыл бұрын

@@siuautomotive, I'm more knowledgeable about Hondas than other brands so I'm not sure how the other automakers do it, but the 2019+ Pilot and Passport and 2020+ Ridgeline normally start in 2nd in D(rive). Honda mentioned the change in a press release for the 2019 Pilot in the powertrain section. "When in Drive and under light-to-moderate throttle, the 9AT will now start in second gear for smoother launch and lower speed acceleration." - hondanews.com/en-US/honda-automobiles/releases/release-164e5a01acd24285b02d91d077ddbeb7-honda-pilot-arrives-with-a-new-attitude-for-2019-sporting-fresh-styling-new-technology-and-standard-honda-sensing

@brunomarado890 3 жыл бұрын

@@siuautomotive On the Jeep Renegade and Compass Trailhawk they start by default in 2nd gear. The 1st gear is activated and locked when you select ''low range''.

@SHURIKAUTO 3 жыл бұрын

Hello. on the new 9HP48 units we saw a DIFFERENT torque converter. This torque converter has an additional mechanism inside. Looking at the outside of the torque converter, the modified torque converter has a massive cast iron ring on the outside, my question is, do you know about the new design of the torque converter?

@siuautomotive 3 жыл бұрын

Hmmm, No sir, I haven't seen the converter you are talking about. I wonder if it was on the 9HP50. They've made some improvements to this transaxle.

@SHURIKAUTO 3 жыл бұрын

@@siuautomotive Perhaps you know. The new design of the torque converter has a new mechanical device. I am guessing this is a device for reducing shifting shocks. Why do you think this is? kzfaq.info/get/bejne/qcCmqMWQuZuYZ4U.html

@pmo5821 3 жыл бұрын

@@SHURIKAUTO looks like those are pendulum mass dampers. They’re supposed to help reduce low-rpm vibrations

@jtizzle275 2 жыл бұрын

Hello, I experienced a loud grinding, clunking noise that lasted a couple seconds as I was making a left onto the highway and accelerating; could that be the differential gears grinding? I didn’t feel the transmission slipping or jerking; it felt normal. Thanks I have a Honda passport 9sp

@siuautomotive 2 жыл бұрын

Just a guess, but it might have been a dog clutch engaging when parts were rotating. That's about the only thing I can think of that would grind like that and not reappear.

@jteeezy275 2 жыл бұрын

@@siuautomotive thanks! It was pretty loud, and as I’m recalling, it slightly vibrated the front driver and passenger floor. I was accelerating to probably 35-40 mph. My wife and I were like what was that. I thought it was a suspension noise at the time. It also sounded like rocks hitting the bottom of the car, but we were on paved asphalt. Its been a couple months and hasn’t happened again.

@barbrolidman5603 Жыл бұрын

After reinstall in car my Cherokee 948TE shows in Drive when I turn on key, no matter what position shifter cable is placed in the trans, clicking through detents yields no change in display. Unplugging TCM from transmission makes display go blank. What are possible internal culprits?

@LynxStarAuto 15 күн бұрын

Sounds like a range sensor issue. Range sensor on these is delicate. Have to be careful when disassembling

@thesmartguy3523 Жыл бұрын

Any experience with the P0936-64 on a evoque with the 9HP48 ?

@calvinnowak245 Жыл бұрын

did you figure anything with this code i have the same problem with my zf

@thesmartguy3523 Жыл бұрын

@@calvinnowak245 yes in my case it was a internal fault, one of the dog clutches were bad, we replaced the whole gearbox

@barbrolidman5603 2 жыл бұрын

Related to my previous question, I am specifically looking at Jeep/Chrysler applications.

@siuautomotive 2 жыл бұрын

As far as I know, the hard parts are the same. I do know that ZF is releasing a newer generation of this trans and there are many improvements. I haven’t seen one apart yet though.

@barbrolidman5603 2 жыл бұрын

@@siuautomotive What I want to do is take all components from a 2020 Jeep 948TE and put them into an earlier year case. Why, because my 2020 case is badly damaged (holed) where the trans mount bolts to it. And I don't know where to buy just a 2020 bare case. Earlier years are much cheaper to buy complete trans compared to 2020. Make sense? Doable?

@toolsonabudget7763 3 жыл бұрын

i just bought a pacifica with 103k miles do u recommend i change the oil in it or just leave it be of course i would use oem mopar but i would not be changing the filter

@siuautomotive 3 жыл бұрын

I personally would change it with Mopar fluid.

@toolsonabudget7763 3 жыл бұрын

@@siuautomotive for sure thanks

@MidnightAspec 3 жыл бұрын

Just an FYI, the MDX pictured does not employ this transmission.

@siuautomotive 3 жыл бұрын

That's a picture of the 2016 MDX. My service info shows only a 9-speed available for the 2016. Of course, I don't have an MDX so I'm going off the service info at www.in.acura.com.

@dh5254 Жыл бұрын

Yes it does my 2018 mdx with the J35Y6 has a ZF 9