New EcoSaw Hydrostatic Model!

[mike_belben]

It strikes me it would be better to have a reservoir for the oil, with the tractor (or power pack) just turning a pump, rather than having to provide the oil as well.  This would also provide all the cooling you'd need, as the hot oil would return to the tank to be cooled.  More weight and more oil, but no cooling rad or fan and any size tractor would do.

Hydrostatic circuits continually recirculate the same oil from pump to motor.  the replenishing valve exchanges only a portion of the circuit volume.   So cooling is a must.  The reservoirs often only have one line on them and flow goes both ways in it as needed.  There is not much exchange with the reservoir like an open center system. 

[dudders]

I guess that's how modern systems work, where the intention is to keep a minimum of oil being carried about.  My telehandler works like that, but not the sawmill.  For my Trekkasaw, there's a 20-gallon reservoir, with the oil continuously being dumped in and sucked out.  Although it's more weight and space, any size tractor can be hooked up to it, or even just a static motor, which is how mine works.  (Tried to upload a pic, but no go.  It's in my photos.)  The Ecosaw seems to have the same principle, but with a smaller tank, so some cooling is likely necessary for hard work in hot climes.  I rate it very highly, for simplicity, reliability and general handiness.