Posted by caterpillar guy on June 21, 2016 at 15:17:24 from (71.82.184.255):
I am having problems with the booms not lifting. Now it is an old electric over hydraulic deal. When it went south we just plumbed them in to the tractor hydraulics. This has worked for a few years now very well. Today the booms worked to open up and started to spray. Stopped for a tree and now they will not lift or fold. I can lift them by hand and swing them with the valve. With a gage I got 1500 PSI at the couplers on both sides of both couplers. Now this afternoon I went down again to try after I had checked this out, and added a couple gallon of oil. It was not low, but not quite full either. So it is now about a couple of gallon over full not concerned with that. This afternoon all seemed good went to the field and same thing happened. This time I put a gage on the cylinder line, and got on the lift cylinder 500PSI on the swing 800PSI. I am guessing there is something in the system after the tractor causing the problem. The sprayer is hooked to an 806 IH I sprayed 40 acres yesterday worked fine.
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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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