Posted by Brendon-KS on February 28, 2018 at 08:56:29 from (72.214.204.139):
In Reply to: Hydraulic motor posted by pat sublett on February 28, 2018 at 07:58:47:
The need for a drain depends entirely on the type of circuit and the style of motor. All closed-circuit piston motors require the case drain to be plumbed back to tank - otherwise the shaft seal would blow out as soon as the system builds charge pressure. With open-circuit orbital or gear motors the need for a case drain depends on the application and how much back pressure is against the outlet port. For a single motor that returns back to tank the drain line generally isn't required since the case can drain at low pressure into the return side. However, if you have motors in series (the outlet of one feeding the inlet of the next) all motors except for the last one would typically need a drain since the backpressure could exceed what the shaft seals can take.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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