Peculiar hydralic behavior on 86 Ford 555B


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Peculiar hydralic behavior on 86 Ford 555B

james bertrand Backhoe one stabilizer will slowly lower when machine is working other end (i.e. bucket). OR have noticed similar behavior when actuating boom cylinder. The left side cylinder is the culprit and is sluggish compared to RHS. The 'leak' is not, I belive, in the cylinder as it will remain in position for days (retracted) without movement. I wonder if there is something peculiar in the valve 'cluster'? How could overall pressure fluctuations in the tractor cause the stabilizer (RHS'outrigger') to begin to decend? BTW, this lowering is under Hyd power as I've tried to chain the two stabilizers together but the chain was severed in a matter of minutes of tractor operation. Otherwise machine runs great and has outstanding power. Ideas? Opinions?
rick Definitely sounds like an internal leak in the valve cluster. I don't know you're particular hardware, but I would suggest talking with an experienced hydraulic troubleshooter. Sounds to me like a careful disassembly and examination is in order.
Jim Bertrand Thanks for the reply. Since the posting I've discovered what 'may' be the problem. The linkage
to the stabilizer has some play in it. If the lever is nudged to the rear (i.e. extend or deploy the foot) it begins to slowly (and I do mean slowly) extend. When operating the machine this lever gets josled (can't think of a better word) to this new position and so begins the 'inadveretent' deployment of the stabilizer.
I will examine the linkage for play and the interim cure is to hold the lever in the retracted position with (don't cringe) a bungee cord or somesuch. Otherwise the machine is well behaved and performs.
thanks, jim_b



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