Farmall Super A Final Drive Assembly

Curt Cooke · Aug 16, 2018

Exactly what prevents the axle assembly from walking out of the final drive housing? Obviously the bull gear is secured to the axle but I don't see anything other than the bull gear that would prevent the axle from just walking out.

gene bender · Aug 16, 2018

theres a nut on the inside holding the bearing and the axle from sliding out the bull gear just rides on splineds not secured to the shaft the hub on the gear keep it n place

Curt Cooke · Aug 16, 2018

I think I understand you Gene. It seems that if one removes the cap screw from the inside end of the axle AND the 4 capscrews from the bearing retainer at the outer end of the axle, you can simply tap the axle out, that is, slide it out of the bull gear. Usually if you don't remove those 4 cap screws of the retainer, you can't remove the axle because the outer axle bearing is press fit on the axle, but beyond that, there's nothing keeping you from bumping the axle out once the large cap crew is removed from the inner end of the axle. And it seems odd that IHC would count on the bull gear itself to assure that the axle doesn't walk away OR that they would depend on the press fit of that outer bearing to see to it that the axle doesn't walk. In the case of what i'm working on, the outer bearing is snug but not press fit on the axle. I'll study some more.
Thanks,
Curt

Hendrik · Aug 17, 2018

The integrity of the whole assembly does not depend on any press fit. The axle is shaped like a mushroom. On the stem of the mushroom the large ball bearing, the tube like spacer, the bull gear, the small ball bearing and a washer are stacked and held firmly in place by the capscrew.
You are right in saying though that the ball bearings should have a tight fit on the axle.
HTH

Curt Cooke · Aug 17, 2018

Thanks HTH, BUT, imagine the bull gear is not there but replaced with a spacer of equal width on the axle. Now can you tell me what would prevent that axle from walking out of the housing? Mean to say, that if one had no experience, he might remove the inner axle cover, remove that 15/16" fine thread cap screw and washer , then commence to try and drive the axle out. He would likely soon figure out that he's got to remove the cap screws from the outer seal retainer and then he would be able to drive the axle out while the gear, washer and spacer fell into the oil pan. Now again, if it weren't for the presence of the bull gear, he could do that. So now if the fit of the outer axle bearing isn't real good, why wouldn't he be able to drive the axle right out without as much as removing the screws that hold the outer retainer to the housing?
C

ih560 · Aug 17, 2018

The axle will slide right through the bull gear. The bull gear isn't holding anything in place.
It works just like many spindles, the inner bearing holds the axle from sliding out and the outer bearing prevents it from sliding any farther in.
The nut on the axle shaft at the inner bearings is what keeps it all together. If that squares you, then don't drive your vehicle. Many of the front hub assemblies are made the same way. On older 2 wheel drive vehicles the front hub was only held in place because of the bearing on either side of it and the nut keeping the bearings from sliding off the spindle.
Unit Bearings are a little different, but same idea.

ih560 · Aug 17, 2018

if that scares you I meant.
I hate trying to type things on my phone sometimes.

Farmall Super A Final Drive Assembly

Curt Cooke

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gene bender

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Curt Cooke

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Hendrik

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Curt Cooke

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ih560

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ih560

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