Re: bull gear not sitting in the middle of housing

Posted by ScottyHOMEy on February 10, 2009 at 06:57:35 from (71.241.192.17):

In Reply to: bull gear not sitting in the middle of housing posted by bdnc on February 09, 2009 at 14:48:07:

I've gone to the caseih parts stie just to confirm that the 140 final drive is essentially the same as that for the As and Bs. It is, and a lot of the parts numbers match right up.

So . . . working from my books . . . here goes.

1) Judging from the drawings, yes, the bull gear should appear to be reasonably, if not exactly centered up. You don't say which way it is off-center (to the inside or the outside), but I'd think it would be worth getting a light up into there to try to see how the bull gear is aligning with the pinion above that drives it. (Note: I don't know what state of disassembly you're in, but if the final drive is on the tractor, PLEASE make SURE you've got things blocked up SECURELY before you stick your head and a light under there!)

2) For all the parts on the axle carrying the bull gear, it's important to have them all assembled in the right order for everything to wind up aligned as it should be. I had a vague recollection of a specific caution abuot a spacer and I was able to find it in the IH manual. In addition to the wide spacer (looks like a bushing), there is one spacer that is nothing more than a thick washer to look at it, and it belongs on the inside between the inside bearing and the wide spacer, so that it shims everything to the outside. Having it on the wrong side could offset your gear to the inside. That washer-like spacer is #23 on the parts blow-up, either from your book of the caseih site.

3) It's dangerous sometimes to rely on drawings for dimensions, so this may be a little out there, but it APPEARS that the spline neck on the bull gear is longer on one side of the gear than the other, with the longer side to the outside. The drawing gets a little crowded where the inside neck of the gear butts up against, so it may all be an optical illusion.

Bottom line, if the gear appears only a little off center relative to the housing and you are able to see that it is meshing directly with the pinion above it (no overhang of the pinion on either side) you are probably fine.

If you see an overhang in the meshing of those gears, and the overhang is on the outside of the bullgear, I'd guess that you got that spacer/washer on the wrong side.

If it turns out that the spacer is installed correctly on the inside and the pinion still overhangs the bull gear a little on the inside, then it may be that my eyes haven't deceived me and there is an inside and outside to the gear (Sticks in my head that there is, but, as in #3 above, I'm not at all sure of it) and it needs to be turned around.

HTH.

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