640 Inner Axle Seals

pburchett

Member
I want to stop my rear axles from leaking differential oil onto my breaks and wheels so I need to replace the rear seals. I wondered if it would be acceptable to only replace the inner seal on the trumpet by pulling the rear break/bearing assembly/axle out and just replacing the inner seals.

I don’t have a torch to cut the bearing collar off or reinstall it so I was going for an easy way out and only replace the inner seals.

I was wondering if this procedure explained here
www.external_link.com/20-ford-new-holland-tractors/442290-brake-shoe-replacement-800-series-ford-tractor.html
is correct before I started this chore?

If this procedure is correct I will start collecting parts as I intend to restore the tractor to working order.
 
Can't get your link to work.

Yes, replacing only the inner seals as you described would in fact stop any more oil from migrating to the brakes.
 
Is there a difference between a 640 and an 860? I don't think so!! In my case,860, replacing the inner seal only didn't solve the problem. Had to go the whole nine yards the second time to solve the oil getting into the brakes problem!
 
(quoted from post at 19:58:29 09/19/18) Is there a difference between a 640 and an 860? I don't think so!! In my case,860, replacing the inner seal only didn't solve the problem. Had to go the whole nine yards the second time to solve the oil getting into the brakes problem!
he way I see it, the inner keeps differential lube in and out of bearing. And the outer keeps bearing grease in bearing (between the inner & outer seal) and off of brakes. Now, if the inner is not doing its job, then the outer could take up the slack I suppose.
 
Where does the oil come from? The diff. I maintain that if the inner seals were properly installed, oil should not have leaked past them onto the brakes.
 
The inner (trumpet) seal is the oil seal, intended to keep rear axle oil inside. The axle bearing is lubricated by wheel bearing grease replenished only when the bearing is repacked, which requires removal and replacement of the collar. It is a near certainty that your wheel bearing(s) need(s) to be repacked.

The outer seal is not an oil seal and is intended only to keep wheel bearing grease from the brakes. If the inner oil seal leaks, rear axle oil will wash the wheel bearing grease from the bearing and some of it will get onto the brakes.

Furthermore, the wheel bearing clearance is determined by the shims on both axles. If the bearing clearance is excessive, the bearing will be loose in the cone allowing the axle to move within the bearing, allowing even a new seal to leak.

Bottom line: There is no easy way out.

Dean
 
The link came from www.external_link.com

https://www.external_link.com/20-ford-new-holland-tractors/442290-brake-shoe-replacement-800-series-ford-tractor.html

Thanks for the comments. I am sure a little of the grease has washed out of the bearings.

I think my son and I will rebuild the old tractor a little at a time and paint it later. Its not like we use it much as I have the new Kubota but it was my dads and I will pass it on someday when its is in better shape and my son is older and has a use for it.
 

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