How to Properly Refill the ZF 6HP19/21 Transmission

[email protected]

Corporal
Free Vendor
Nov 6, 2016
157
Madison, AL
#1
Hey guys, I've been seeing some people reporting some issues lately resulting from not properly filling the transmission after rebuilds, upgrades and/or maintenance. These issues range from poor shift quality to failed shifts that have ultimately resulted in trans limp mode.

It's also extremely important to reset and relearn the adaptations every time the ATF is changed so I'm working on finishing that DIY for you guys as well.

The attached DIY uses several sources referenced from ZF literature that I've modified for clarity and comprehensiveness.

I'm happy to answer any questions you guys have regarding this procedure.
 

Attachments

Last edited:

doublespaces

Administrator
Oct 18, 2016
6,758
AZ
#2
Good write up. I've saved this document for later.
 

R.G.

Lieutenant
Nov 17, 2016
591
Henderson, NV
#4
Jason,

I read in one of the docs I found that the car should be in N when filling. I suggest everyone check their fluid again after a 100 miles. Managed to get another .5 liter in. Use the fluid Jason recommends, those other brands will cause problems, ask me how I know.
 

[email protected]

Corporal
Free Vendor
Nov 6, 2016
157
Madison, AL
#5
Jason,

I read in one of the docs I found that the car should be in N when filling. I suggest everyone check their fluid again after a 100 miles. Managed to get another .5 liter in. Use the fluid Jason recommends, those other brands will cause problems, ask me how I know.
Excellent point about checking the fluid level again after 100 miles. We were able to get an additional .5L in after a few miles as well.
I also have seen the other instructions call for the trans to be in N when filling. I've done it both ways with the same result so we went with P in our instructions for safety purposes.
 

matreyia

Lieutenant
Apr 19, 2017
769
#6
Hey guys, I've been seeing some people reporting some issues lately resulting from not properly filling the transmission after rebuilds, upgrades and/or maintenance. These issues range from poor shift quality to failed shifts that have ultimately resulted in trans limp mode.

It's also extremely important to reset and relearn the adaptations every time the ATF is changed so I'm working on finishing that DIY for you guys as well.

The attached DIY uses several sources referenced from ZF literature that I've modified for clarity and comprehensiveness.

I'm happy to answer any questions you guys have regarding this procedure.
---------

Hey Jason,
How important is it to have the AC turned on when doing the ATF fill? I have never heard of this requirement from shops, youtube diy videos, or even the Bentley manuals. What does the AC do when it is turned on while filling the ATF?

VT
 

[email protected]

Corporal
Free Vendor
Nov 6, 2016
157
Madison, AL
#7
---------

Hey Jason,
How important is it to have the AC turned on when doing the ATF fill? I have never heard of this requirement from shops, youtube diy videos, or even the Bentley manuals. What does the AC do when it is turned on while filling the ATF?

VT
Every piece of ZF literature I've ever read regarding this procedure included turning the AC on. It puts more load on the engine which in turn pulls more ATF through the system so you get a better fill. Not doing so could cause your ATF level to be lower than optimal.
 

R.G.

Lieutenant
Nov 17, 2016
591
Henderson, NV
#8
Guys, have your shit ready to get under the car and refill before starting it up. The window where the trans temp is ideal comes and goes QUICK. It takes hours for the fluid temp to settle back down if the window passes, even in cooler weather.
 

cityazndan

Specialist
Jan 17, 2017
93
#9
So this gets the full (11-12qt?) of ATF out instead of the traditional 6-7L trans pan service, correct?
 

rebo0t

Specialist
Mar 14, 2017
59
#10
Thanks for sharing. Saved for later
 
Jun 1, 2017
178
#12
what are you guys using for ATF Fluid in your 335 auto trans.i have a 2008 335 e90 so not sure if the autos are different from the next.Reason why im asking is i have Redline ATF D4 in my car.when my warranty was up i drained,filled with redline,drove around drained again so it would mix then filled up again so i can get most of the old fluid out.Im just wondering if i should keep the Redline in or switch to something else.Now im running a single turbo and whatever i can do to help the longevity of my trans.
 

matreyia

Lieutenant
Apr 19, 2017
769
#13
what are you guys using for ATF Fluid in your 335 auto trans.i have a 2008 335 e90 so not sure if the autos are different from the next.Reason why im asking is i have Redline ATF D4 in my car.when my warranty was up i drained,filled with redline,drove around drained again so it would mix then filled up again so i can get most of the old fluid out.Im just wondering if i should keep the Redline in or switch to something else.Now im running a single turbo and whatever i can do to help the longevity of my trans.
I recommend zf. Fluid for non-modified trannies.

But if ypu have redline on there already ot will be super expensive to completely flush out the redline. Stick with that until it goes kaputt.
 
Oct 28, 2017
830
Monroe CT
#14
What else should be changed besides fluid and pan/ filter i have read their are 4 seals and mech sleeve that should be changed some say to change solenoid as well at 60 to 100k and is their a kit that just has everything needed?
 

matreyia

Lieutenant
Apr 19, 2017
769
#15
What else should be changed besides fluid and pan/ filter i have read their are 4 seals and mech sleeve that should be changed some say to change solenoid as well at 60 to 100k and is their a kit that just has everything needed?
I just did that job for a client.

1. four seals tubeshaped
2. one rectangular seal
3. new set of solenoids on valve body
4. new filter/pan
5. new ATF
6. reset adaptations
7. ZF drive programming procedure
 
Oct 28, 2017
830
Monroe CT
#16
I just did that job for a client.

1. four seals tubeshaped
2. one rectangular seal
3. new set of solenoids on valve body
4. new filter/pan
5. new ATF
6. reset adaptations
7. ZF drive programming procedure
Where are you located?
 

matreyia

Lieutenant
Apr 19, 2017
769
#17
Where are you located?
I am based in Houston.
For that service I charge $500 labor. Client is responsible for proper ATF 10 liters, solenoid kit (eshift or m shift), all seals and o rings, pan filter, solenoid foam strip separator, and mechatronic external connector seal.
 
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