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Hencho

Hello all,

I screwed up and let the automatic transmission fluid get too low in my model 875 and now it’s not working. I added fluid jacked it up and ran it for 10-15 minutes. The wheels turn but with no power. I checked the bypass valve, closed tight. Does anyone have any suggestions?

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daveoman1966

Take the hydro pump off and rebuild it.  You'll probably find some deeply scored soft brass parts (Piston Slippers) that need resurfaced.

This isn't so tuff to do, just be meticulous with it and get it right.  

Resurface the Piston Slippers, Thrust Washer, Charge Pump Housing, and the Base of the pistons Cylinder Block.  Use a FLAT surface plate and...using figure 8 motion... progressively sand off the scoring using 220...400...and 1000 grit sand paper.  Don't remove excess material...just enough to remove the scoring and scratches.  Reassemble using Assembly Oil and install a new filter.  I have posted on Red Square the procedure and pics for the overhaul...  but don't know where the moderators have included it.

  

SUNDSTRAND HYDROGEAR refurb.docx

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Hencho

Thanks Dave,

Are the TIMKIN seals readily available at industrial supply store? Also where would I be able to get the Sundstrand O rings & case gaskets?

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roadapples

Check with Wheel Horse Parts and More in the venders section...

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pullstart

@Hencho.... :text-welcomewave:

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pfrederi
Posted (edited)
13 hours ago, Hencho said:

Thanks Dave,

Are the TIMKIN seals readily available at industrial supply store? Also where would I be able to get the Sundstrand O rings & case gaskets?

 

 

Check this posting out for seals and O-ring sizes

 

 

Edited by pfrederi

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Hencho

Thanks for your help. I’m beginning to believe that I can do this!

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953 nut

:WRS:

We think you can do it too. The beauty of a :wh: is that they used standard off the shelf parts which don't need to be sourced through the dealership.

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The Tuul Crib
On 6/28/2020 at 10:34 PM, roadapples said:

Check with Wheel Horse Parts and More in the venders section...

:text-yeahthat:Lowel is top notch! Hope I spelled it right.

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