If the system is clean to start with, a filter on the return is best just as M Diesel said. On our test machines and customer machines (tractors, skid steer, swathers, combines, etc.), we filtered the return with a finer mesh, in our case a 10 micron filter and customers sometimes used a 25 mic. On customer machines, there was typically just a screen on the suction, but on our test machines we installed a large 74 or 49 micron screen element. We also on test machines had a circulating system, which you will not have on a tractor or implement, that had a large capacity 10 mic filter as well as a cooling or temperature control system.
A couple of things to consider here.... 1. You can not use a very fine micron element in a suction line, because as the filter fills with contaminant, it will "choke off" really quickly, like a snowball effect. and 2. In cold weather conditions, or even just normal cold start conditions, the filter will not flow as easily. Like I said, we over-sized the flow capacity and used a 49 or more often, a 74 mic cleanable steel element.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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