Posted by IH fan on June 04, 2010 at 06:15:22 from (69.148.146.229):
In Reply to: 560 hydraulics posted by El Toro on June 03, 2010 at 14:52:00:
mkirsch said: (quoted from post at 07:11:05 06/04/10) I would recommend against doing anything to increase the pressure. Remember you're talking about a 50-year-old (on average) tractor that was designed for 1500PSI hydraulics originally. All the hydraulic lines and valves on that tractor are original and have 50 years of fatigue on them. Plus, replacements are difficult to come by when you do blow something.
I'll second what he said... the pump may only be designed for 1500psi. The rest of the system is probably not a problem, but the pump could be. I don't know for sure if we (Cessna) built the pump in the 560... we did for at least some 460s, so I'd bet we did also for the 560. At the time we built those pumps, we "under-rated" them, or tested them at a higher pressure, but since they are probably hard to find these days (Eaton, who bought Cessna, does a very poor job of supporting older components), why take a chance. Another 250 psi might not be enough anyway, and I surely wouldn't go more than that. I know there were two sizes of pumps made for them, but don't recall the displacement. I would also recommend a larger diameter cylinder. I had a friend that bought a really heavy Wilbeck offset disc that his 4640 JD would not lift until I found some NOS parts to build him a 5" limit stop cylinder. We only made a few of those cylinders, but luckily still had parts to build at least one more.
Might also be a good idea to recheck the pressure to be sure it's still high enough and also check it hot to be sure it isn't lower then.
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