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800 to NAA pump transferrable

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Lawrence (LA)

10-19-2002 13:43:23




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I have a 1953 NAA and a Ford 800. I took the pump off of the 800 and put it on the NAA. Is this acceptable, are these pumps transferrable? I am still having problems with the NAA lift.




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Scott

10-19-2002 18:44:21




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 Re: 800 to NAA pump transferrable in reply to Lawrence (LA), 10-19-2002 13:43:23  
The 800 pump is not recommended for the NAA it has too much flow (larger pistons in pump) and will cause a correctly working NAA hydraulic system to overeact in draft control and when moving the lift lever.



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Lawrence (LA)

10-20-2002 08:46:17




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 Re: Re: 800 to NAA pump transferrable in reply to Scott, 10-19-2002 18:44:21  
Ok thanks. I took the original NAA pump off of the NAA and put the 800 pump on in it's place. I am having allot of trouble with this system. I have been having trouble since I bought the tractor a year ago. I find that there are allot of problems associated with this lift system. Thanks for your help.



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ZANE

10-19-2002 18:32:50




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 Re: 800 to NAA pump transferrable in reply to Lawrence (LA), 10-19-2002 13:43:23  
What problems are you having with the NAA lift?

If you can describe the problem I might could help you.

Zane



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Lawrence (LA)

10-20-2002 08:56:06




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 Re: Re: 800 to NAA pump transferrable in reply to ZANE, 10-19-2002 18:32:50  
Well to start; when I bought the tractor the draft control didn't work like the book says. In draft control the implement would dop to the ground and drag behind me. Not a desired trait. Anyway after about a year the implement would slowly drop after the engine was turned off so I changed the piston seals. The implement would stay up since I stopped the leaking rings on the piston. After about two months I noticed the implement dropping slowly during use. I would start cutting a field with the implement at a set hieght and after about twenty minutes notice the implement dropping so I decided to look at the insides of the lift system. I removed the cover and cleaned up the insides. I replaced orings and gaskets that I bought from the local New Holland dealer. I have been reading your posts and didn't want to use store house orings so I bought the Ford part. In an attempt to eliminate the pump as being the cause I took the pump off of my 800 and stuck it on the Jubilee. Now the lift won't lift anything more than a drag bar with nothing hooked to it. It will lift me fine but when I hook a bushhog or box scraper to it it won't lift it at all. I am severely frustrated at this point. I can't seem to get this right. FInally I ordered the video to fix this system the right way. Which I have not received yet. If you have any pointers or assistance I would greatly appreciate it. Thanks.

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ZANE

10-21-2002 04:30:30




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 Re: Re: Re: 800 to NAA pump transferrable in reply to Lawrence (LA), 10-20-2002 08:56:06  
The easiest and quickest way to check on the Ram cylinder rings is to simply remove the filler plug on top of the lift housing and with an implement on the lift try to raise the lift. If the rings are leaking you can see the oil coming out the rear open end of the cylinder.

If the lift will stay up after you have helped it up by lifting it yourself then you have trouble either with the back pressure valve or the system relief valve which is in the belly of the lift housing. It can be accessed by removing the plate from the bottom of the housing and threading a quarter inch fine threaded bolt into the end of the relief valve and pulling it out. It is not servicable and if this is the problem needs to be replaced.

The back pressure valve is located in the lift housing at the very front edge and is mounted horizontally behind a plug and plunger. It consists of a spring and ball. If this spring is damaged or weak it can cause the systems you are having. To remove it for inspection you will have to first remove the bolt that is holding the transmission housing to the differential housing. If the bolt is inserted so that it won't come out you can burn or cut it out and replace it with the nut toward the back of the tractor. Look at it and you will see what I mean.

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ZANE

10-21-2002 04:36:01




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 Re: Re: Re: Re: 800 to NAA pump transferrable in reply to ZANE, 10-21-2002 04:30:30  
If the lift is leaking down rapidly and it is not coming from the rear of the ram cylince then it is possible that the pilot safety relief valve is leaking.

This valve can be accessed by removing the remote valve adapter plate from the top of the lift cover. This cover will have four 7/16" bolts and one 5/16 bolt holding it on. The relief valve is in a hole under the cover and is shaped sorta like a spark plug. This is not supposed to be repairable either but if I were you I would mark where the top is and then remove it and inspect the ball, spring and ball seat. I have found foriegn materials between the ball and seat more than once and just cleaned it up and replaced it and fixed the problem.

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Jim.UT

10-19-2002 13:56:23




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 Re: 800 to NAA pump transferrable in reply to Lawrence (LA), 10-19-2002 13:43:23  
I have no personal experience with that swap, but I've seen plenty of NAA's with the later piston pump installed. The most obvious difference is the hydraulic lines. NAA/Jubilee have separate hydraulic lines and the Hundred series has a one-piece manifold. I'm not sure what complications this difference causes in the swap.

My 800 still has the original vane pump and it still works. Someday I'll be making a swap, too.

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Lawrence (LA)

10-19-2002 14:00:11




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 Re: Re: 800 to NAA pump transferrable in reply to Jim.UT, 10-19-2002 13:56:23  
Thanks for the info. I didn't have this problem with the original pump on the NAA that is why I am asking. I ordered the video but haven't received it yet. I am anxious to watch the video so that I can see the internals reworked by a professional. I am not sure what is causing this problem to continue.



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