D3 clutch replacement being stubborn

[Ron Bailey]

Hello I have a D3b CAT dozer. I recently replaced the left
steering clutch. But ran into a problem with the arm on the
clutch in not going back in place correct. The distance between
the piston cylinder that pushes the arm out is over extended
and the arm is against the wall. The arm will not push out any
further to activate the clutch and arm will not push towards the
cylinder. I have taken the whole clutch unit in and out about 10
times looking for a problem that I can not find. Had no
problem with this when I took the clutch out! In the picture I
have the stop screw extended out as far as it will go. The
screw has since been removed to try to give the arm room to
move

 

[Ron Bailey]

More pictures,
Anyone see anything wrong??

 

[AJ.]

I am only guessing as I never encountered that problem in the hundreds of clutches I took out and but in in my career, it could be that the yoke is not in the bottom bearing or the bearing is not in the housing, it could be the throw out bearing is turned the wrong way, clearly something is wrong with the way its put together, I think you will be taking the clutch out again, post a picture of the clutch and yoke.
AJ

 

[Ron Bailey]

Hello AJ. Thanks for the reply.

This thing is giving me fits!!

We never went into the bearing side, we only replaced the
clutch disk.

Would you think the bearing might have slipped some how?

 

[AJ.]

You need to check that the bottom bearing cup for the yoke is in the housing, if the clutch is in see if you can move the top of the yoke back and forth as well as in and out, there should be no slop, usually when fitting the clutch the bearing cup gets a blob of grease, if you did not have the throw out bearing out then that should be ok, could the yoke be turned wrong, take it steady and weigh up how things work and you will crack it.
AJ

 

[chuck carpenter]

Hi, did you guys ever come up with a solution? Believe it or not I have the exact same problem with a friend's 931b left side clutch, any answers? Thanks

 

[trackrat]

They can be a pain to get together sometimes we have or have had 931,955,939, and a d6 worked on all of them sometimes they just don't want to go back together easy

 

[chuck carpenter]

Yep,I know, I have had this very same problem 35 years ago but I don't remember what I did to correct it, it was a 931B and I did not return to the shop, i had that clutch back out the second i figured out the arm was in the wrong position, i was also doing the update to the non adjustable rod at the time so that became a holdup, but was a non issue, I am now retired, Cat 33 years and volvo 10years. Since June this year. Entire career is have only done 4-6 931s and 3 D3s?, did more wet clutches than dry mostly 955,977, d6 d7 a lot of D8s h and k. I just need someone to refresh my memory a little.
Here I am again saying " hey" I have had this one before!! So what was the fix?......I don't remember. Too long ago and it made me feel stupid then just like it is today. We'll pulling it back out Monday so I will post the results, I have a feeling it's going to need the throw out bearing flipped, maybe this will help the next guy some day if I figure it out again.

 

[Fritz Maurer]

Yep,I know, I have had this very same problem 35 years ago but I don't remember what I did to correct it, it was a 931B and I did not return to the shop, i had that clutch back out the second i figured out the arm was in the wrong position, i was also doing the update to the non adjustable rod at the time so that became a holdup, but was a non issue, I am now retired, Cat 33 years and volvo 10years. Since June this year. Entire career is have only done 4-6 931s and 3 D3s?, did more wet clutches than dry mostly 955,977, d6 d7 a lot of D8s h and k. I just need someone to refresh my memory a little.
Here I am again saying " hey" I have had this one before!! So what was the fix?......I don't remember. Too long ago and it made me feel stupid then just like it is today. We'll pulling it back out Monday so I will post the results, I have a feeling it's going to need the throw out bearing flipped, maybe this will help the next guy some day if I figure it out again.

I had a helper put a clutch piston in a D6C backwards.... worked on it for a week trying to get it to turn left. Finally had to take off the fuel tank and go back in there. Could see the blown seal hanging out of the piston soon as the cover was lifted.

 

[chuck carpenter]

Completely resolved, dum like i thought, clutch stack height was at 2.10" spec. 1.5 to 1.939, too thick is just as bad as too thin and it throws the arm out of its working range. Pic is after the repair, removing and measuring disc to find the right combination to give us 1.8", works like butter.