Re: Re: Re: Re: JUST WONDERIN AOBUT A HYDRO-STATIC TRANS

Posted by Ken McWilliams on August 25, 1999 at 20:44:23 from (205.188.199.187):

In Reply to: Re: Re: Re: JUST WONDERIN AOBUT A HYDRO-STATIC TRANS posted by Gerald J. on August 25, 1999 at 20:24:23:

Gerald,

I've checked Baum's, Bailey's and Northern's catalogs. At best they have vane pumps, but not pressure compensated ones or variable displacement ones. I used the "swash plate" variable pumps in my work, but I've found them to be pricy.

Years ago I worked at a plant that was using Contential pumps that were pressure compensated and variable volume vane pumps. The vanes operated inside of a movable ring. The ring was offset by a spring and when the pressure built up the ring centered itself by pushing against the spring until it was destroked, and stopped pumping except to replace losses. It had a variable volume of 0 to 15 GPM by using a setscrew and jamb nut thru the housing and restricting the amount that the ring would move off center. I could probably use a plunger sealed with orings attached to a lever in place of the setscrew to give the variable displacement. I want to keep the expense down. The loader/backhoe is just a hobby around my farmette to remove stumps and trench for drain pipes, I can't justify expenditures for more than that.

KRM
Dayton, OH

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