I am pretty sure they can be rebuilt. I have never done it, so I can't tell you how to do it. I have a copy of the Blue Ribbon Service Manual on the 300 & 400 series hydra touch. It explains how to disassemble, inspect and assemble the valves. I would suggest getting a copy of this manual, I got mine off ebay, there is one for sale there now.
My manual says there is a test fixture and a couple of other special tools required. I would say that any O-rings would be readily available. You could either buy them individually from the IH dealer, auto parts store, or save some $$ and buy a whole O-ring kit and use what you need out of it.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that�s wha
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