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George, replace your hoses. If the outside has deteriorated, then the inside is as well. My aircraft also had 15 year old hoses that were falling apart. I redid all of the hoses and when I took the pump apart for an overhaul, I found black residue all over the inside of the pump and resevoir. I would suggest you check your pump and cylinders as well. The degrading lines destroyed all of the seals in my gear door cylinders, which I had to rebuild. The main cylinders were already rebuilt a year before, and the seals were still good. The hoses are cheap to make. i am still cleaning out black pieces from my system. Even though the filter on the pump caught alot of it, the spool valve was still covered. I was amazed the gear still worked.
Luke Alcorn
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