Posted by Bill VH on August 24, 2013 at 07:32:57 from (69.141.105.183):
I just rebuilt, in a way, a hydraulic pump. It had some issues lifting, figured I'd see what I could do about it. I dropped the pump, took the whole thing apart, blew out all the channels, replaced the side chamber gaskets, ground down the valves and seats. I did a really nice job. Replaced the safety valve. I replaced the lift piston earlier with the newer style.
Everything was going great. Went out to test the system. Test one (about 200#) worked great for the lift and lowering. Smooth and held great. Thought I might trying something a little heavier, before I started patting myself on the back too hard.
As I was lifting the heavier item, something in the pump went BOOM!! Much to my surprise, it was the side of the chamber, at the top, just below the plug, as listed in the exploded view in the I&T manual.
I was shocked to say the least. I can replace the side chamber, as I've got spares, but not that many spares. I don't want to make the same mistake twice.
I can't figure out a few things: a) why didn't my new safety valve relieve the pressure before the metal blew out? b) did I tighten the cap screw too tight. I didn't find a torque value for that cap screw, and I've had them leak in the past, so I really bore down when I put this together. c) could the side chamber have been stress before, had a hairline crack or something like that.
I did remove this pump from a parts tractor I have. It is actually a steel pump, not a cast aluminum pump (which surprised me). There was some water in the belly as expected, but not that much water. This blow out was right where the plug (part #3 in the exploded view) meets the valve chamber. Which would have been much higher than any water that was in the belly.
I'll drop the pump later, and get some pictures if that will help. I appreciate your thoughts. This really woke me up this morning when it happened.
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