i have a 1991 ford 2810 with an allied loader on it. 3 yrs ago a power steering cylinder bent on it. We replaced that one and it was fine for awhile. The other day both cylinders bent on it and the odd thing was both were fully extended when they bent. I pulled the pump housing off to check the pressure relief valve to see if it was dirty or maybe had backed out. Everything was clean and tight. I put everything back togather and tested the presure coming out of the pump to a dead headed gauge and got 850 psi, which is what it should read. I am trying to figure out what happened before i spend the $500 or $600 on new power steering cylinders just to have them bend all over again. I am stumped righ now. Anybody have any ideas?