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Friends JD 430 Trans Issue


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#16 Texas Deere and Horse ONLINE  

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Posted October 24, 2017 - 09:10 PM

Jeff said it's enough pressure to blow the axle seals out of it. I think it's the output shaft seal on the pump causing the issue.

But what do I know! Lol
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#17 olcowhand ONLINE  

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Posted October 24, 2017 - 09:27 PM

Jeff said it's enough pressure to blow the axle seals out of it. I think it's the output shaft seal on the pump causing the issue.

But what do I know! Lol

But it would seem like if it was oil pressure escaping the hydro unit into the differential, then it would have to be intaking that same amount of fluid from the diff back to the pump.  That would keep everything in a neutral state.  There would seem like it would have to be bringing something from the atmosphere into the system.


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#18 olcowhand ONLINE  

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Posted October 24, 2017 - 09:27 PM

And I know Brian, I said I was going to bed, but haven't quite made it yet. 


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#19 dropped82 OFFLINE  

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Posted October 24, 2017 - 09:42 PM

I kind of thought the rear seal also. My thinking was getting a pressurized return as opposed to a low pressure return after fluid goes through the system normally.

I'm not in any way arguing here. Daniel has been into more of these than me and I've learned quite a bit from him.

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#20 WNYTractorTinkerer ONLINE  

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Posted October 24, 2017 - 09:44 PM

Sounds like a pump issue as the pressure is escaping into the case..  A blown seal or gasket hopefully..  A cracked case or pump / hydraulic motor is the worst case scenario.  A pressure test will tell the tale..

 

HERE is the service manual for the pump..

 

 

Oh- and Welcome aboard!!    :wave:  :driving_big_tractor:


Edited by WNYTractorTinkerer, October 24, 2017 - 09:47 PM.

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#21 KennyP ONLINE  

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Posted October 25, 2017 - 04:57 AM

Tnx for help my friend

Look up by your user name for a PM.



#22 Alc OFFLINE  

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Posted October 25, 2017 - 05:33 AM

Do these have common trans/diff sumps ?  I would think they all do . Could there be any chance that the breather hose/fitting is plugged ? 


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#23 GardnMastr OFFLINE  

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Posted October 25, 2017 - 11:29 AM

Its a gravity return, the transmission is the sump, no seal on the return. similar Sunstrand U-type hydro on early Cub Cadets with the transmission as the sump. My money is on the plastic elbow, drilled hole, vent being plugged. Else, how could it build pressure to push out axle seals.



#24 olcowhand ONLINE  

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Posted October 25, 2017 - 03:00 PM

Its a gravity return, the transmission is the sump, no seal on the return. similar Sunstrand U-type hydro on early Cub Cadets with the transmission as the sump. My money is on the plastic elbow, drilled hole, vent being plugged. Else, how could it build pressure to push out axle seals.

Yes, transmission is the sump, so any leak would have to equal itself out in my mind.  Oil doesn't compress, so even a high pressure leak is still just swapping volume for volume inside the closed system.  Closed except for the vent.  If I remember right, on the 430 the fill tube up next to the dash is also the vent?  A clogged vent would definitely cause pressure buildup, as when the oil heats up it expands, and also as has been stated, any moisture in the oil once heated has to build vapor pressure.


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