First thing I would do is take a shop vac and clean out that box, it's a mess! I blow ours out with my 1 hp air compressor, it takes awhile, but it works. We have a pump that draws out of the lake, and a pressure tank, so I run the pressure tank up to 60 psi and then blow one zone, 6-8 heads. then I have to wait for the pressure to build up to 60 again. When we are watering I run 2 zones at once, as the pump will produce 40 gpm at 40 psi. Our zone valves can be turned on manually by turning the coil, but yours are covered with so much $hit I can't tell what they are. And the question is, how cold does it get where you live? It gets -30 F where we live! If it's against the wall of the house you might be able to just cover it with some Styrofoam and be OK.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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