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Discussion Forum
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No lift: chapter 3

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Nick

04-29-1999 14:16:41




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well, I'm into this job for about $700 now, figuring oil and new pump and relief valve. I finally got nice oil flowing from the pump bleeder, where there was none before. I replaced the seals on both ends of the suction manifold, and installed the pump according to instructions, using two gaskets to get a bit of backlash in the drive gear. Filled all three housings with new oil, fired her up, and no lift! The arms are dead as doornails. Guess I need to do surgery to the pedestal, eh? Any suggestions? Thanks guys!
Nick

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ken zent

05-30-1999 18:39:20




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 Re: no lift: chapter 3 in reply to Nick, 04-29-1999 14:16:41  
Had same problem--found check valve spring broke.
Replaced spring-everything ok now.



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Bern

04-29-1999 17:17:31




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 Re: no lift: chapter 3 in reply to Nick, 04-29-1999 14:16:41  
Your unload valve in the lift cylinder is stuck in the dump posistion. Remove lift cover, pull out unload valve plug with a slide hammer(plug with threaded end), remove unload valve, clean it and the bore, replace o-ring, and reassemble. Unload valve is located next to main control valve, parallel to it. Cause of above mentioned problem? Sludgy oil and/or sitting around too long. P.S. I'm assuming we're talking about a 600-900 series or NAA tractor here.

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Nick

04-29-1999 18:17:47




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 Re: Re: no lift: chapter 3 in reply to Bern, 04-29-1999 17:17:31  
Bern, sorry for my abruptness....yes, it's a 640, and it DID have sludgy oil, and was sitting. I'm after the stubborn valve tomorrow at first light,...well, maybe at 9-ish...
Nick



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Nick

04-29-1999 18:13:54




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 Re: Re: no lift: chapter 3 in reply to Bern, 04-29-1999 17:17:31  
Bern, wow, that's the sort of answer I was after! Now I feel like I approached this job backwards. I tried to go after the simplest things first.
Stay tuned.....nonstop coverage continues! Thank you Bern!
Nick



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Sned.

04-29-1999 17:55:47




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 Re: Re: no lift: chapter 3 in reply to Bern, 04-29-1999 17:17:31  
Well Nick I have learned some things from your endeavors. I have never had to work on my H.D. system...thankfully. I'm sure the day's a comin though .
Don Snedden...AKA Sned.



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