Merc 722.6 transmission problem - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand


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Old 10-06-2015
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Default Merc 722.6 transmission problem

On the weekend my Mercedes 722.6 Nag transmission started having a shift problem from 2nd up to 3rd gear. When changing up it doesn't engage straight away and slips which makes the engine rev up to 500 RPM max or less if you accelerate less during the shift up.
Here's one explanation that quite a few other searches have suggested.
I have to apologise for the YouTube guy up front because he's really annoying and waffles on & on & on just to get to the point but he does explain it and show the fix very well.

My car is now up to 210,000, has anyone else had a similar shift issue? Any thoughts or other suggestions?

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Last edited by multihull; 10-06-2015 at 10:09 PM.
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Old 14-06-2015
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Mine's 545RFE but an interesting video though.
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Old 16-06-2015
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Sorry to hear of your transmission issue.

Have you tried just changing out the old fluid?

I found a good video in Youtube that demonstrates the process here:

The only gotcha is that I am not entirely sure if the Commander's transmission includes a dipstick that measures the level of fluid, so you may need to fabricate a dipstick to measure the existing fluid level BEFORE draining out any of the old fluid or purchase the dipstick which is shown in the video.

Last edited by tempestv8; 16-06-2015 at 09:01 PM. Reason: Wrong link provided
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Old 17-06-2015
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Quote:
Originally Posted by tempestv8 View Post
Sorry to hear of your transmission issue.

Have you tried just changing out the old fluid?

The only gotcha is that I am not entirely sure if the Commander's transmission includes a dipstick that measures the level of fluid, so you may need to fabricate a dipstick to measure the existing fluid level BEFORE draining out any of the old fluid or purchase the dipstick which is shown in the video.
I've done 2 scheduled transmission fluid changes since the car has come out of warranty. I checked the fluid level last week via the sealed dip stick tube. I do have a genuine Merc dip stick too. The level is perfect as expected as I have no leaks and the colour is good and there's no signs of sparkly fluid which would indicate major damage to planetary gears or clutches etc. so I hope that just means a it's a faulty Transmission Conductor Plate.

I'll find out tomorrow when I start surgery to the tranny. I'm looking forward to doing the job. Standby for an update.
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Old 01-07-2015
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Bugger, it looks like the clutch plates have worn out and it's a rebuild or buy a second hand unit. I have replaced the connector plate. Checked value wear and all is good. There was no sign of chucks of metal just signs of a small amount of what may appear to be extremely fine particles of alloy. (Non magnetic) In fact it looks pretty good apart from the clutch plates for 3rd which is a common problem for the 722.6 NAG1.
I put it all back together and had a factory / dealership code read and clear and it still has the same issue of 2nd to 3rd gear change flare.
2nd hand transmissions are cheap at $1300 and the a weekend to change over. Oh well that'll be kind of a fun or should I say interesting weekend.

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Old 01-07-2015
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Have you read about Transgo Shift Kit's

http://www.ebay.com.au/itm/Mercedes-...-/321695215964

Quote:
Addresses Insufficient Pressure Rise, 2-3 Flare, TCC slip or Shudder, Soft Shifts, Shudder on Hard Throttle Acceleration from a stop. Improves and restores correct drivability with added durability.
http://www.transgo.com/products.php?...dcountview=Yes
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Old 05-07-2015
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Thanks Clarky, I had not seen this kit but I have seen a similar one. I have remove these values and checked them for wear. There is very little signs of wear in these and other values. I also did a temporary fix and check to confirm that leaking of these values weren't causing the problem but this did not change or fix the issues.
The price for this kit is high and it's cheaper just to change the transmission over despite the mucking around and time but I enjoy doing this stuff.
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Old 05-07-2015
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Multihull - if this Transgo shift kit works like the one for the 5 speed 545RFE trans found in the WJ and KJ, it's main benefit will be firming up shifts and reducing the clutch slippage, therefore decreasing wear and associated heat. Considering your predicament now it could be cheap insurance for you.

Where are you getting your second hand trans from? Why are they so cheap? Is it because it's out of a Mercedes Sprinter van?
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Old 05-07-2015
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Quote:
Originally Posted by Hanna View Post
Multihull - if this Transgo shift kit works like the one for the 5 speed 545RFE trans found in the WJ and KJ, it's main benefit will be firming up shifts and reducing the clutch slippage, therefore decreasing wear and associated heat. Considering your predicament now it could be cheap insurance for you.

Where are you getting your second hand trans from? Why are they so cheap? Is it because it's out of a Mercedes Sprinter van?
Thanks Hanna & Clarky, I went back and read the tech details on this Transgo kit and have decided to give it a go. I have found it elsewhere a lot cheaper plus I decided to also buy their rebuild kit for the my 722.6 / NAG1 transmission which includes the troublesome clutch plates. This will save me AU$500.
Here's the links for the parts:

http://www.americanpowertrainwarehou...er-dodge-jeep/

http://www.americanpowertrainwarehou...02-heavy-duty/
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