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  #1  
Old 01-16-2002, 01:12 PM
MERCEDES300CE's Avatar
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Technical Service Bulitin

Hi,

Are TSB's public info? Will the dealer tell you what they say or print out a copy?? I recently had to replace the rear band in my transmission and I was told there is a TSB on it. How would I acquire a copy of it??

I appreciate any info you can provide. Thanks in advance!
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #2  
Old 01-16-2002, 01:55 PM
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www.alldata.com will provide a list of the technical service bulletins, you can do this for free.

A subscription to www.alldatadiy.com provides me with access to all the actual TSBs, but only allows access for my specific car.
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  #3  
Old 01-16-2002, 03:01 PM
Saguaro2000
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What problem did your tranny have?

Dean, I also have a '90 300CE. Curious what the symptoms were that caused you to have do the repair you mentioned. TIA.

Mike
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  #4  
Old 01-16-2002, 03:41 PM
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TSB 27_085

722.3/5 Brake Band Piston B1 Automatic Adjustment


91mercedes02

TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: February 1991

REF. NO. 27/85


SUBJECT: ALL MODELS WITH CERTAIN AUTOMATIC TRANSMISSIONS 722.5 AND 722.3 BRAKE BAND PISTON B1 WITH AUTOMATIC ADJUSTMENT


The brake band piston B1 with an automatic adjustment of the release clearance was installed from July 1990 to September 1990. On these transmissions only, measuring or adjusting of the release clearance is not required.

Effective Serial Number

Transmission Transmission End Number Range
from to

722.3/722.5 03 420 691 03 450 408

Function of Automatic Adjustment

The brake band B1 is engaged by the oil pressure build-up between the brake band piston (37) and the brake band piston cover (40). The brake band piston is shifted against the force of the return compression springs (35/36) until the brake band B1 is applied. This lifting action of the brake band piston causes the diaphragm spring (37a) to pull along the pin (37c), while the stroke "L" (inset) is covered first. If the stroke is greater, the lock (40a) retains the pin and the diaphragm spring (37a) is shifted on the pin (automatic adjustment) (Figure 1).

For releasing the brake band B1 the oil pressure is reduced. The force of the return springs (35/36) forces the brake band piston back until the pin contacts the brake band piston cover. The locking action of the diaphragm spring (due to the shape of the diaphragm) cannot be overcome by the force of the return pressure springs. During this release action, the brake band piston B1 is moved back only by the stroke "L". This corresponds to a release clearance of 1.9 to 2.4 mm.
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  #5  
Old 01-17-2002, 08:34 AM
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Hi,

Thanks for all your input. The problem I had was the rear band broke. No one is quite sure why and I didint know if the TSB would tell me how to prevent it from happening again.

The transmission was just rebuilt about 60k mile ago and had to rebuild it again. Didnt want this to be a regualr occurence, as its pricey to fix.

Symptoms were no forward gears, left me stuck at a stop sign, just like that! Stopped at the sign and when I went to pull away, nothing happened. Reverse was functional, but no forward. Engine revs but no drive, like its in neutral only.

Thanks again for all your help.
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #6  
Old 01-17-2002, 09:06 AM
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There isn't any such bulletin! Many mods were done to this trans in it's lifetime but NOTHING as far as reinforcement of that band. The lining & application piston were modified however.
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  #7  
Old 01-17-2002, 09:11 AM
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unband
 
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So are you saying... don't trust alldata? That's where I got it from. How would you explain its existence? Hrm... maybe I should give that alldata site a call.

Kuan
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  #8  
Old 01-17-2002, 06:59 PM
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Kuan, YOU are talking about a completely DIFFERENT problem than this post line. WE are talking about a broken B-2 BAND!
B-1 auto adjusting piston has nothing at all to do with a broken B-2 band That I was talking about(post line). Yes that is a valid bulletin but not for THIS problem!
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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  #9  
Old 01-17-2002, 08:08 PM
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unband
 
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There ya go, don't put dangerous information in my hands.
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  #10  
Old 01-17-2002, 11:59 PM
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Was the tranny rebuilt by a dealer? The reason I ask is, if someone used an aftermarket band, I could see an early failure.

I have seen the factory bands break, but not after 1 or two years.
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  #11  
Old 01-18-2002, 08:56 AM
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Hi,

Both times only Benz parts were used. The first time it was rebuilt the transmission was slipping, this time it was rebuilt due to the band breaking.

The previous mechanic feels it is from doing a "holeshot", I assure you I have never done one in this cars lifetime. The person who rebuilt it this time feels the band was adjusted to tight, and the rear transmission mount needed to be replaced. Causing movement in the rear of the transmission.

I am just trying to find out why it broke, and how to prevent it from happening again. I put in synthetic fluid this time, though I am told that should make no difference.

Thanks again for all your input. Greatly appreciated!
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #12  
Old 01-18-2002, 12:03 PM
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the contributors of premature wear on a mechanical item appear to be limited to:

1) engineering platform
2) materials
3) workmanship
4) use

to islolate your issues, you may wish to review in detial all the new MB parts used in each rebuild and compare to the failures or conditions requiring the next tranny rebuild (a partial tranny rebuild or non-comprehensive tranny rebuild may have been done previously)

further you may wish to research if any conditions/old or new parts may have contributed to your B2 failure (aka caused B2 failure)

I've heard that factory MB tranny revbuilds are top quality and comprehensive- and have a guarantee- parts and labor. You may wish to spend a little more this time to go this route time and put this to rest with peace of mind.

-fad
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  #13  
Old 01-18-2002, 01:04 PM
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Hi,

The last time it was rebuit it was a MB tranny rebuild, costing just under $3k, this time I had the transmission rebuilt by the tech and it cost just under $2k. He said it did not need a complete rebuild, just the band and the piston had to be replaced with the mount and a control cable.

The waranty on the rebuild was 3years 36k miles. It was rebuilt 12\10\98 and died on 12\26\01, leaving me with no warranty. Hope this one lasts longer than 3 years 60k miles.

Thanks again for all your help and input.
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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