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8N Lift problems

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David Martin

07-10-1999 17:05:16




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My lift worked flawlessly for 5 yrs other than a little leakage with heavy implememnts. Now will not lift my heavy bushhog without throttling wide open. I have already replaced the top end piston rings and the safety relief valve. Now, I am staring at a 3/8" hole in the pump housing bottom corner just below the exhaust control valve#34. It does not appear to be in the pressurized fluid channels, it simply goes through to the pump base. But, why would it be there and can it be welded shut? Is it the source of my problems? Also, someone has actually welded a bead on to the bushing for intake control valve #24. Could not imagine why, but actually broke the cotter key when they did it. I understand this is a pressed in piece. I plan to replace it, but do not know if it will affect anything. The lift will now hold up my heaviest piece if you can get it up, even when you shut it down. That is what leads me to believe the hole is just the result of someone's carelessness and not a stress break. I have already cleaned out all of the valve chambers and I did not see anything obvious. Please help if anyone has any ideas.

Thanks

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Dell (WA)

07-11-1999 08:01:51




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 Re: 8N Lift problems in reply to David Martin, 07-10-1999 17:05:16  
David..... ...sometimes ya' need to do a little "side-by-side" comparisons, specially if you're really not too familiar with what you're working on. I'd try to find a pump somewhere (dealer? used parts emporium?) for a lookie-see.

Not a really detailed hydraulic's expert..... infact I'm more of a non-spurt (grin) ..... ..Dell



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David Martin

07-13-1999 18:19:03




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 Re: Re: 8N Lift problems in reply to Dell (WA), 07-11-1999 08:01:51  
The lift lifts again...
The hole in the pump housing turned out to be a poor casting job according to my local Ford dealer. Not critical to the function of the system. The poor welding job on the intake control valve was just ugly, though it worked. My dealer did not even have 1 on the shelf so I cleaned it up, put a new cotter pin in the back and let her rip. The problem all the time must have been trash in the valve chambers because tonite she shot that heavy bushhog straight up at an idle speed. Ready to run another 47 years.

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thanks.........Dell (WA)

07-13-1999 22:56:13




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 Re: Re: Re: 8N Lift problems in reply to David Martin, 07-13-1999 18:19:03  
David..... ..thanks for follow-up. When you're blind guessing about a problem its nice to know. Glad it started working for you, go and N-joy..... ..Dell



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