B7100 HST neutral finder problem

[6mmbr]

I have a '94 B7100HST that is new to me. It had a problem where it would not return to neutral. The opposite pedal had to be tapped to get it stop travel in that direction. Annoying to say the least, dangerous an understatement. examination from underneath identified the problem, which prompted taking it apart to fix and clean. It required rear separation to get to it. This uncovered a bad U-joint. One thing led to another and I've got it almost all apart to begin restoration and rebuild.

Here though is the original problem:

The "neutral holder" (part# 66204-43310) had loosened and slid outward on its shaft such that it no longer rode upon the bearing (08121-06000) on the "arm neutral holder" (66204-43343). Instead it rode upon the washer which actually cut a groove into the bottom of the neutral holder and wore down the arm shaft. This positioning did not allow it to go back to neutral on its own. See the pictures below for normal and abnormal.

normal:

abnormal:

Amazingly these parts are available and I have replacements on the way. Otherwise I would weld 'em up and grind to spec. In order to prevent this from happening again (in case the HST shaft is worn and responsible) I plan to substitute a fender washer for the OEM washer (04011-50100) so that it overlaps the neutral holder preventing it from slipping off in the future.

thanks

 

[6mmbr]

Of course I couldn't stop there, so now my B7100 looks like this:

I have some degreasing/sandblasting/painting to do.

 

[RobertN]

Looks like fun! And simpler; my old Kubota was a '85 B8200 19hp. Just compared to 1985, it seems like tractors have got lot more complicated.

Like your avatar...

 

[Thomas]

I had 95 B7100HST for 14 years also had the same problem.

Seem the orginal piece/pieces weren't as good as the replacement parts,also the thicker grease during winter cold will at time slow return or not at all to netural.

Thats one heck of project...you have my attendion.

 

[6mmbr]

The solution.

 

[Egon]

Had the same problem with mine. There is a10mm nut that is (say difficult to access) that can work it's way loose.

Note: there is a fine adjustment On the right side that works on an eccentric washer type principle.

 

[Deano]

I was going to suggest the fender washer anyhow...but I see you did that! Nice job!:thumbsup:

 

[Kenonf]

I was removing my universal joint for the front wheel drive and saw a little access panel on the right side of the tractor. I pulled the two 12mm bolts and I found I could access the neutral holder eccentric washer. I was able to remove both items and found the spacer was missing, this is why my kubota will drift untill I tap the hst pedal to stop the creep.
I thought i was goinig to have to split the tractor for the repair, but I was able to get the parts out with out too much trouble. Now to Kubota and get a spacer for the hst and a universal joint, rubber boot, band clamps and bushing to finalize the repair on the front wheel drive.
Ken

 

[Egon]

You might also want to check the roller that sits in the v configured plate that also centers the HST.

 

[DCarter]

So glad to find this thread. After lots of searching finally a detailed thread with pics that explains how the HST pedal centering works. I'm a new owner of the same tractor with the same problem, hopefully with the same cause. Will take a look at mine today and see if that peice is off track.