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Moisture in IH Hydros

M

Mike (WA)

Well-known Member
We all know water builds up in standard tractor transmissions and rear ends, from condensation. Does the same thing happen with hydrostatic transmissions in IH tractors?

I assume they use fluid separate from the rear end.

What say you?
 
You ASSUMED wrong. The tranny/hydro/hydraulic oil is in common, using the tractor's main case as the reservoir.

Working tractors (that are used on a regular basis and WORKED so they come up to temperature) suffer FAR less from moisture in the oil than seldom-used tractors left sitting out in the weather.
 
Tractors kept in the shed when not using where they belong do not get condensation. The only opening is the gearshifter.
 
Here in Iowa the inside of the gearcase is gonna sweat whether it sits out or not. Somewhere there's a vent in the system and it's venting all the time whether the tractor is being used or not. I sometimes get the feeling there is more sweating happening in tractors that sit inside a cold unheated shed. Jim
 
That's kind of what I was thinking. If the metal roof of an unheated building sweats, why wouldn't the transmission case of a tractor inside that building do the same thing?

Mainly what I was getting at here was the configuration of the system. If a hydro has its own oil, it would seem like a similar situation to the automatic transmission in a car, which doesn't accumulate moisture. But if, as Bob says, it shares common fluid with the rest of the tractor, I can see how it would accumulate moisture in the rear end casing, and possibly be subject to freeze damage in winter if not used, and the water separates out in the hydro unit.
 
The inside of a normal tractor gearcase has a whole lot of exposed walls, covers, gears, etc. that are not immersed in oil so they are in the open air, so to speak, to warm and cool and condense moisture. The automatic tranny in a car has to have a vent somewhere, but it doesn't have near as much open space inside. Jim
 
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