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Ford 9N, 2N & 8N Discussion Forum
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My STUPID Rear End

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Ramrod

05-11-2005 17:45:55




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I am still confused about installing my axles, here's the deal...

1. I rebuild my differential, replaced housing, ring and pinion gear and all internal bearings and races.

2. I bought new axles and hubs, had new Timken bearings pressed onto axles.

3. Repaired center housing, painted and reinstalled with new PTO seal and bushing. Hung right trumpet, installed differential, hung left trumpet. Shoved in old axles, turn one CW, opposite one turns CCW.

4. Pulled old axle, installed 4233 inner seal, lubed seal and axle/bearing assembly and slid new axle/bearing into place.

5. Installed 4222 bearing race into 4124 bearing retainer, flipped it over and installed 4251 outer seal.

6. Slipped the bearing retainer assembly (minus shims and brake back plate) over axle and slid it against the trumpet to check initial fit. I found that the axle has about 1/4" end play!

By my confused reasoning, this should have not happened, as the bearing should have protruded enough to prevent the retainer assembly from coming all the way against the end of the trumpet. My new axle slides through the seal until the back of the bearing bottoms out against the inside of the trumpet. Is this right? I just keep going over it and pouring through the books, can't figure it out. I hope I'm just being dumb, but I can't see any point in going further with the assembly unless I can come up something here.

Ramrod

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Dan

05-11-2005 18:04:38




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 Re: My STUPID Rear End in reply to Ramrod, 05-11-2005 17:45:55  
Keith - do you have the other axle installed and the bearing retainer bolted down? You need one shim between the backing plate and the axle trumpet, and about 3-4 shims in between the backing plate and the bearing retainer. Quickly bolt both sides on, then start adjusting shims on one side until you get the pre load correct.

Good luck,
Dan



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Ramrod

05-11-2005 18:35:25




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 Re: My STUPID Rear End in reply to Dan, 05-11-2005 18:04:38  
Yep, you're right. I had to go sit down and eat some dinner and think it through. The other axle is what keeps it from pushing too far through, and the end play of a few thgousands keeps the axle ends from rubbing against one another. Having only one axle installed, I couldn't get it straight in my mind. I'll bolt up one side with two thick shims and then move to the other side and use my remaining group of shims to get it set up.

Lights ON; Stupid alarm OFF...

It's pretty much what Dell told me earlier, and exactly what you've been trying to tell me all day.

Thanks Guys!

Now let's get your hyd knock fixed.

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Bob

05-11-2005 19:22:12




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 Re: My STUPID Rear End in reply to Ramrod, 05-11-2005 18:35:25  
The axle ends DO butt up against each other, and rub on each other in normal operation.

Even when the preload is correct, and you install the wheels and tires, the angle of the tapered roller bearing "cups" is such that the weight of the tractor bearing against the angle of the cups will force the shafts inward, and they always operate in contact with each other.

As others have said, as long as there isn't a bunch of play, nor are is the preload so great that there is NO play, and there is so much preload the axles turn in the same direction when you rotate one side, you'll be OK.

It's NOT brain surgery!

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