Differential side gear pitting

For my 1961 Case 530 tractor with model 42 loader\backhoe, the differential side gear pinions, the teeth have remnants of rust pitting. I was hoping to just re-use them. The bull gear teeth are have no pitting. The reason my differential is all apart is my ring gear lost a few teeth due to left hand bearing carrier broken in 3 pieces. I'm putting in a good used ring and pinion, plus all new bearings\races. I've pretty well emptied my pockets yet could afford good used differential side gears if I really have too. Any suggestions?



 
I was asked one time ,what will I be performing with this tractor. Lite duty, daily driver in the field. Let that be your guide as to wheather additional money is to be thrown at her. Best of luck in your decision . CM
 
I guess if it were me and I had good parts for the rest of the job I would look for some gears in better condition. I'll pass on some wisdom given to me many years ago- There's never money to do it right the first time but there's always money to do it a second time!
 
Last time I checked only one side was available
from Case. Don't know if any aftermarket has
started making them. Good used will probably be
hard to find. Tony
 
i definitly would not use those gears , as the hard surfacing is gone and asking for trouble.they are on the way out. be ok in a parade tractor where no load is applied. have one of those teeth break off and you could have megga crunches.
 
(quoted from post at 18:23:28 09/19/17) i definitly would not use those gears , as the hard surfacing is gone and asking for trouble.they are on the way out. be ok in a parade tractor where no load is applied. have one of those teeth break off and you could have megga crunches.
I think that's what already happened, pieces of the gear that broke got stuck in these. If you put these back in the tractor, you will always be wondering if today is the day it's going to break again.
 
It's more than just "rust pitting".

It's called "spalling".

The gears are paperweights.
 
Good choice on replacing. Little bit about contact fatigue and spalling

http://www.machinedesign.com/mechanical-drives/how-install-bevel-gears-peak-performance-assemble-spur-and-helical-types-different
 
It's interesting how the gear is spalled on one face of the teeth at one end of the gear and the opposite face of the teeth at the other end of the gear. What would cause that?

A. There was just enough play in the pinion shaft bearings that as the shaft tilted slightly and an uneven load was applied to just one end of the pinion gear, on one face only. When the tractor changed direction, the torque reversed, the pinion shaft tilted in the opposite direction, and the uneven load shifted to the other end of the gear as the shaft turned in the other rotation, causing the wear on the opposite side of the teeth on that end of the gear. This explanation might make sense if the tractor spent a lot of time pulling in both directions (like loader work). It would not make sense if the tractor spent almost all its time pulling in one direction (tillage work).

or

B. Eventually there was huge amount of play in the pinion shaft bearings, so much that the pinion gear tilted more than the backlash with the bull gear gears allowed. The pinion gear was binding between the forward tooth of the bull gear at one end of the pinion gear and was binding with the trailing bull gear tooth at the other end of the pinion gear, creating excessively high tooth loads at the ends of the pinion gear and on opposing faces of the pinion teeth at the same time. This explanation could make sense if the tractor spent almost all its time pulling in one direction (tillage work). Clear as mud?

Any other ideas or explanations?
 

My right axle housing was separating from bottom of differential case so bull gear was on a slight tilt so I figure that did nothing good to side gear. Also lots of broken gear teeth chips in diff housing so I expect pieces of teeth were possibly getting stirred up and munched between teeth.

Because tractor has a loader I expect a lot of the wear was caused by forward reverse motions.

I think your ideas of what occured ss55 are all correct.
 

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