greasing TN rear hub

[Soundguy]

Hey i like that one.. reminds me of the auto greasers on our big milling machine.. has greas lines to a couple places and an air powered grease pump setting in a keg on the back of the machine.. maybee something could be made with a lever activated gun band clamped to the axle.. or perhaps an electric gun???

( neat idea! )

soundguy

 

[DieselPower]

That's what gave me the idea, auto lubers. I have installed "remote lube points" on a couple of trucks and ag tractors before. Usually those impossible to get to ones. All you need is some high pressure plastic line and a couple of NPT thread adaptors for the hose.

 

[jimg]

I cant envision how that would work. The fitting spins w/ the hub. Any line would have to go from the wheel to the tractor frame...sorry I just dont have a good imagination.

 

[DieselPower]

Oh, that wouldn't work then. I was thinking the fitting was on the axle end, not the rotating hub. So more or less it's set up like the grease fitting found on the front hubs of riding mowers?

 

[RickB]

Interesting.. so thay have a bearing with a seal on either side... I was wondering about that.. IE.. If it could have been splash lubed via the axle trumpet.. but that answers the question.

Soundguy

There is only one seal, outboard of the outer bearing. Both outer and inner axle bearings are lubed by the transmission/hydraulic fluid. My understanding is the grease fills a void between the axle shaft flange and the axle seal, effectively protecting the seal with a layer of grease around the outer radial face. Hence the unsightly mess of grease surrounding the inner side of the axle flange and even the wheel center on tractors that are liberally greased. The text in the appropriate section of the op manual I have here supports this.

 

[jimg]

Yes, Im pretty sure about that....Im not w/ the tractor until Sat but IIRC it spins w/ the hub.

 

[Rowski]

There is only one seal, outboard of the outer bearing. Both outer and inner axle bearings are lubed by the transmission/hydraulic fluid. My understanding is the grease fills a void between the axle shaft flange and the axle seal, effectively protecting the seal with a layer of grease around the outer radial face. Hence the unsightly mess of grease surrounding the inner side of the axle flange and even the wheel center on tractors that are liberally greased. The text in the appropriate section of the op manual I have here supports this.

Does the grease must come out between the inside axle flange and the outer side of the final drive housing before it gets into the hydraulic fluid?

 

[jimg]

The grease isnt lubricating anything then but rather acting as a simple seal/separator. If thats true then its very important to evenly apply the grease as per the manual. Still seems a strange design.

 

[Robert_in_NY]

From my experience, the grease will come out evenly around the axle without having to rotate the tire. Once I see the grease start to move on the back side I quit but the grease moves all at once.

 

[Rowski]

Not sure if the link works....


TN axle breakdown


It shows what we're talking about. I'm wondering if the seal is a double or triple lipped. That would allow grease in a cavity of the seal and not let it get into the bearing. I would like to think that a seal must be sealing in the hydraulic oil, not just the presesnce of grease keeping in the fluid??

When I posted earlier I assumed that the item labeled PAG.2 PAG.3 was a seal but its not, its a shim ordered by thickness.

ALso I noticed that the TN60 has smaller bearings and axles in the rear than the tn70 and larger.



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