Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 06-18-2003, 11:46 PM
Registered User
Join Date: Jan 2003
Location: USA
Posts: 699
Why a reverse clutch pack is often worn out before a forward clutch pack?

Dear friends:

After reading many posts regarding MB auto transmission problems, it seems to me that the reverse clutch pack is usually worn out first even though the forward one is used most of the time. Why such a weird thing on MB auto transmissions?

I'm an auto transmission dummy and have never seen dissassembled auto transmission in my life :-(

Thanks a lot.

Reply With Quote
Old 06-19-2003, 12:09 AM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Well, here's the story. It's the reverse/low band (at least on the K4A/K4C trannies, I suspect it's still a band on the 722.x trannies) that wears the most.

A three speed has four clutches/bands (different builders use different combinations, and GM 350 hydramatics have TWO second gear actuators, one a clutch, the other a band) -- forward clutch, direct clutch, 2nd gear clutch or band, and low/reverse clutch or band.

First gear is the forward clutch and the low/reverse band or clutch - this holds the ring gear stationary and drives the sun gear, I think.

The low/reverse band or clutch is the one engaged last, so that it gets all the slip going into either reverse or forward range. The others are used less often, so get less wear. Usually the low/reverse clutch or band is heavier or has more frictions plates to make up the difference, but they still wear more.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 06:27 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page