PTO Super A; GeneB, CNKS, and others

Hendrik · Jul 21, 2011

I'm in the process of reassembling the PTO attachment (PTO only, no belt pulley). The splined PTO shaft is supported by two ball bearings, separated by a spacer bushing. The bolt that screws into the inner end of the shaft keeps the shaft, bearings, spacer, and gear together.
Now to my question. What keeps the ball bearings from being pushed inward (i.e. towards the front of the tractor)? Is it only the press fit of the outer rings of the bearings in the cast housing?
Thanks, Hendrik

gene bender · Jul 21, 2011

Sorry i havent worked with pto on a SA Just the A and B

Jim Becker · Jul 21, 2011

As I recall, I think one bearing has to press into the housing from the front and the other from the back. A step in the bore of the housing keeps them from moving in too far.

Gene, I believe these parts of a Super A PTO are identical to the later style A/B PTO.

Haas · Jul 21, 2011

The shaft only comes out the back. There is a shoulder on the shaft that bears against the inner bearing race which keeps it from going forward. The outer race of the bearing bears against the housing. The bolt on the inside keeps the shaft from coming out. The bolt retains the gear and the bearing on the shaft. The bearing rests against the housing so the shaft can't come out as long as the retainer bolt is in the end of the shaft. If you take this apart, don't try to take the bolt out and then drive out the shaft. You must take the gear off first and remove the woodruff key. The key will catch on the bearing and prevent the shaft from coming out if you try to drive the shatt out. I don't believe any of this is press fit. Take a look at the parts diagram in the parts catalog and you can figure it out.

gene bender · Jul 21, 2011

I have never seen the splined shaft in any of the ones ive had apart. I just asumed when they went to the super stuff thats when they changed to the splines as ive never read anything about the change.

Jim Becker · Jul 21, 2011

I believe the splined shaft he is referring to is the PTO output shaft. The splines are the ones the implement u-joint slides onto.

Hendrik · Jul 22, 2011

I should go and eat humble pie!
Mistakenly thought that BOTH ball bearings mount from the inside of the housing and that there is a step between the seal and the outer bearing :-(
Haas explained it well and it is depicted clearly in the parts diagram.
Thanks all!

Hendrik · Jul 22, 2011

Gene, I compared the parts diagram for the Farmall A on the CIH website with the drawing in my parts manual for the Super A. The splined shaft (I mean the shaft with splines, which sticks out at the back and to wich the PTO shaft of the driven implement mounts) is mounted similarly in A and Super A. The only difference I noticed was an oiler gear in the A.
Thanks a bunch!

PTO Super A; GeneB, CNKS, and others

Hendrik

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gene bender

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Jim Becker

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Haas

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gene bender

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Jim Becker

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Hendrik

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Hendrik

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