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Hydrostatic transmission question


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#1 SC Farmer OFFLINE  

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Posted January 16, 2017 - 05:54 PM

I have an 1886-01 with hydrostatic transmission.  Everything works great on it, engine, hydraulics, & mower. Thing runs like a scalded dog.  Only problem it has is an initial hesitation with the transmission.  It's like it needs to warm up before it wants to run.  It kind of jerks forward and in reverse also.  Then when it goes, it really goes.  Anyone have any idea why?  Oh, the fluid was changed when I got the tractor, along with the filter and I keep the fluid level up where it should be.



#2 ducky OFFLINE  

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Posted January 16, 2017 - 06:15 PM

Several things.

Charge pump losing it prime due to air leak on suction side.

Low charge pump pressure.  Usually around 100 PSI on Sundstrand.

Dirty filter.

 

Try letting it run a minute or two before moving it and see what happens. This could give us an idea of what might be going on here.


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#3 Deerlope OFFLINE  

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Posted January 16, 2017 - 06:38 PM

The 1886-01 has the Eaton 12 hydro


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#4 Cvans ONLINE  

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Posted January 16, 2017 - 08:23 PM

Too heavy oil in the hydro. Low oil level. Charge pump input shaft seal leaking. 

I went to Automatic trans fluid and it helped a lot. 


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#5 ducky OFFLINE  

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Posted January 16, 2017 - 10:22 PM

Around 85 PSI for Eaton.


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#6 SC Farmer OFFLINE  

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Posted January 17, 2017 - 06:35 AM

Several things.

Charge pump losing it prime due to air leak on suction side.

Low charge pump pressure.  Usually around 100 PSI on Sundstrand.

Dirty filter.

 

Try letting it run a minute or two before moving it and see what happens. This could give us an idea of what might be going on here.

Don and Chris,

 

I drained the hydro fluid when I did the restore last year and replaced it with Type A ATF.  Also replaced the filter, so its new (used a K&N HP-2004 Transmission filter).  There is a leaking seal somewhere as there is a slow drip.  I'll check fluid level tomorrow and do as you recommend, i.e. let it warm up for a few minutes and see what happens.  Thanks again for the help!


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#7 Cvans ONLINE  

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Posted January 17, 2017 - 09:55 AM

I hope you find your leak. I doesn't take much in the wrong place to create problems. Check for side to side play in the input shaft bearing ( or busing ). 


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#8 ducky OFFLINE  

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Posted January 19, 2017 - 04:00 PM

If it ok after let it run a few minutes I would suspect that the charge pump is losing its prime.






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