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Hydro Sump Under Pressure


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#1 BairleaFarm OFFLINE  

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Posted May 25, 2014 - 05:00 PM

The 990 is under pressure after use. Is that normal? I snug the fill plug and its under enough pressure to bubble around the threads.

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#2 JDBrian OFFLINE  

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Posted May 25, 2014 - 05:10 PM

There should be a vent in the system somewhere to keep it from pressurizing. It could be plugged or someone may have inadvertently blocked it off. I had that happen on a JD314. The axle seals were leaking but the problem was a blocked off vent. There was so much pressure that when I opened the fill port the oil gushed out about a foot in the air. If the pressure gets too high it will force oil out the weakest spot which in my case was the axle seals. 


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#3 BairleaFarm OFFLINE  

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Posted May 25, 2014 - 05:25 PM

My axles are leaking as well. I assumed it was bad seals...maybe not. I need to find the vent.

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#4 Canawler OFFLINE  

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Posted May 26, 2014 - 08:21 AM

I've seen this question asked before and everyone reports the same problem with their 990 transaxle, although it wouldn't hurt to hear form some more owners.  The parts breakdown shows no vent.  Someone mentioned that the earlier style dipstick/plug was supposed to be a vent but I sure don't see how it could work as one.

 

As a side note, the transaxle in my GTX is the same way.  I just changed the hydro oil Saturday and forgot about the pressure buildup.  It made one serious mess when I opened the drain plug and oil sprayed all over the deck.



#5 BairleaFarm OFFLINE  

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Posted May 26, 2014 - 08:55 AM

The plug dipstick has a small hole drilled in it. St least mine does or looks like it.

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