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Premium Member
1995 S320
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34 Posts
Discussion Starter #1
I recently replaced the transmission overload switch as it was leaking through a small port hole in the switch. When i pulled the switch out the B1 brake band Thrust element or Thrush bearing element came out with it. there is a small thrust pin attached to the end of the element that is secured to the element by a round plastic clip. The clip fell apart in peices. I had to order a new plastic clip and 2 rubber O rings. As we were at a freinds house and I could not get the pin back in we re-inserted the elemnet with out the pin. The car drove ok accept that I had to pull my foot of the gas pedal in order for it to shift out of 1st gear.
I got a new clip. Put the pin back in and reinserted the thrust element agian.
It was hard going in and I thought I heard a crush or snap as it was being pushed in with Overload switch. I pulled it back out and the pin was still attached, so I inserted it again. I have no fluid leaks but the car now again revs very high and then you let up on the gas and it will shift.
Any clue to what the problem and remedie are?
Did I damage the pistin on the ather side of the B1 Band?
I failed to check the spring in the Thrust element to see if I broke it but it looked like a pretty heavy spring.
 

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Moderator
93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
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8,064 Posts
Okay, here's some food for thought...

That pin you are talking about is available in three or four lengths from the dealer. You could try the other lengths?

Now, the B1 band is clutch lined with tin-steel. It looks like those oil filter wrenches that grip American Oil Filters. The portion of this clutch that actuates is made from plastic, and after 100,000 miles the plastic looks very brittle. You could have cracked-it?

I also think you have to set the working pressure, so the shifting occurs properly by either the multi-size pin, or the out side B1 adjustment.

See the attachments I posted. I think the master PDF doc will help you.

http://www.benzworld.org/forums/w140-s-class/1407863-no-reverse-jerks-reverse-when-cold.html

Best of luck,

Martin
 

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Premium Member
1995 S320
Joined
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34 Posts
Discussion Starter #3
Okay, here's some food for thought...

That pin you are talking about is available in three or four lengths from the dealer. You could try the other lengths?

Now, the B1 band is clutch lined with tin-steel. It looks like those oil filter wrenches that grip American Oil Filters. The portion of this clutch that actuates is made from plastic, and after 100,000 miles the plastic looks very brittle. You could have cracked-it?

I also think you have to set the working pressure, so the shifting occurs properly by either the multi-size pin, or the out side B1 adjustment.

See the attachments I posted. I think the master PDF doc will help you.

http://www.benzworld.org/forums/w140-s-class/1407863-no-reverse-jerks-reverse-when-cold.html

Best of luck,

Martin
Hi Martin
Thanks for your info. When you say the part of the band that actuates it. Does that mean the part that gets pushed on by the B1 piston and/or pushed by the Thrust element? The car still drives okay accept that it doesn't shift from 1st to 2nd with out help ( releasing the throttle pressure ) and 2nd to 3rd may be a liitle off to.
 

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Premium Member
1995 S320
Joined
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34 Posts
Discussion Starter #4
I also cant seem to find mush information about the wiring coming from the transmission overload switch. I have a German Star Service manual libary on CD and I would have though I could trace it there. But that overload switch has very little information
 

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Moderator
93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
Joined
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8,064 Posts
I believe the first 17 pages of this master manual will give you a location of problems, but my guess if most of your gears are having problems. You may have a pressure problem-an external leak(which would be very obvious to you), low primary pump pressure.

Your question, yes the part pushes the B1 Piston.

The overload switch can actually be bypassed.

Look in the Master Manual, and understand how the shifting occurs. How it goes from one gear to another, and what gets activated. Read it a little at a time, so it make sense.

I believe all the late gears are closer to the engine including reverse, and the early gears are further into the transmission.

Martin
 
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