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Order Ford 640 Parts Online

640 lift

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04-21-2003 11:14:51

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I'm looking at buying a Ford 640 that seems to be in remarkably good condition. The major problem is that the lift will only occasionally lift a bush hog. The lift raises when unloaded, will lift and at least shortly hold one adult,but struggles to lift and cannot hold two adults. When the lift is raising, it has a ratcheting or cogwheel feel to it. What are the potential problems? Am I looking at big bucks to diagnose and fix? I am a long time shade tree mechanic, but I know nothing about this hydralic system.

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Phil (VA)

04-22-2003 06:45:36

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 Re: 640 lift in reply to Bob , 04-21-2003 11:14:51  
Search the archives on this board and on the 8N/9N/2N board and look for this subject and/or look for Zane, who has some excellent responses.

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04-21-2003 18:16:58

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 Re: 640 lift in reply to Bob , 04-21-2003 11:14:51  
Bob Does your pump have a square body (then it is a vane pump) or a round body (then it is a piston pump)? From others on this board the opinion is that a piston pump is a superior pump and easier to repair than a vane pump. I don't think you can switch one for the other as the return lines are different. I am sure others will comment. Gene

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04-21-2003 12:58:58

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 Re: 640 lift in reply to Bob , 04-21-2003 11:14:51  
Bob, I'm by no means an expert on these but my old 8N had very similar symptoms. I replaced the tractor because of many other problems but was told that the hydraulic pump needed rebuilt. Hopefully someone that knows more than me will either confirm or correct my information. If that's the problem I don't believe it's a big job or expensive to do.
Good Luck, Lee

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