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Reload this Page Leaking seal on hydostatic trunnion shaft
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  #1  
Old 06-07-2023, 09:10 AM
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thadscub thadscub is offline
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Location: Elizabeth, Colorado
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Default Leaking seal on hydostatic trunnion shaft
Hi:

I purchased a used 125 and have a fairly large leak coming from the trunnion shaft seal. How big of a job is it to replace the seal?

Thanks,

Thad
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  #2  
Old 06-08-2023, 12:48 PM
West Valley G West Valley G is offline
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I believe 3 of the 4 lip seals are replaceable without opening up the hydro
They might be replaceable without pulling the rear end, maybe. I would
pull the rear end to simplify the job. The fourth seal which is the one
the trunion shaft comes through requires opening up the pump.
Are you positive that the leak is the seals? The cork gasket is pretty
famous for leaking. To replace it requires splitting the tractor but that
is not a bad job to do.

Ken
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  #3  
Old 06-08-2023, 01:06 PM
greg r greg r is offline
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I have a similar leak. From what I can tell going through the parts and repair manuals, the pump will need pulled apart to get the trunnion shaft out of the way for seal replacement.

I also would check to make sure the cork gasket where the hydro unit bolts the rear casting/differential is not leaking. Mine leaked a lot and replacing it cut down oil loss a huge amount, now it's more like weepage from the trunnion seal I can live with considering the work to replace it.

A service manual is the way to go to make sure you didn't forget anything and the linkage setup is correct.
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  #4  
Old 06-08-2023, 10:20 PM
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thadscub thadscub is offline
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I saw the a drop coming from the right side seal. Do I need to take the pump apart to replace the seal?

thanks

Thad
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  #5  
Old 06-09-2023, 07:24 AM
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ironman ironman is offline
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Quote:
Originally Posted by thadscub View Post
I saw the a drop coming from the right side seal. Do I need to take the pump apart to replace the seal?

thanks

Thad
According to the Service Manual (see page 18) I'm guessing your answer would be no.

https://inspectapedia.com/heat/Sunst...msn_Manual.pdf
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  #6  
Old 06-10-2023, 02:21 PM
greg r greg r is offline
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Quote:
According to the Service Manual
Cool!! The IH Service Manual does not show that. That area is in tear down/ inspection.

It's a very thin profile seal so getting a small enough tool, maybe a stout O-ring pick to pry with.

Not much room in the tractor chassis, my guess the pump would come out but a least there's no pump disassembly and with the new style pump mounting gaskets that leak potential is covered.

Thanks for the link!!
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  #7  
Old 06-10-2023, 02:54 PM
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If you do decide to tear into it, or if you just want to look at more info,
go to this link, page 2-35 and on covers the hydro.

http://ccmanuals.info/pdf/1x8-9%20&%...e%20Manual.pdf
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  #8  
Old 06-10-2023, 04:13 PM
greg r greg r is offline
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Ahaa. It's coming back to my earlier statement. Check parts exploded view on page 2-38

To get the seal, (#5) out; trunnion shaft (#49) and washer (#42), has to be removed.

Page 2-48 is where I got hung up thinking of just a seal replacement with a maybe a trunnion shaft removal
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