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3-pt lift falling!

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Bob C

10-18-2000 18:48:59




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I just recently picked up a 1948 8N that had been sitting in a barn for the past 10+ years. After getting it home I put a little gas in her, and after a little boost from a 12v battery, got her cranked (yes, I am keeping it 6v). I have rebuilt the carb,put new points and plugs, and changed the fluids. I have checked the compression and found the lowest @ 115 lbs. and the highest to be 130 lbs. I think this pretty good cosidering how long it has sat. She cranks pretty easy on a new 6V battery. I am working through the tractor to see if she is worth restoring. The sheet metal is perfect, rust colored, but no dents or rusted out places. I was fortunate that someone had drained the gas tank, it looks new on the inside.

Now for my problem! When I pick up my bush hog everything works fine, no chattering and plenty of speed on coming up. But the second I depress the clutch the hog goes down as if someone grabbed the lift lever and shoved it down. I have read some of the archives on 3-pt problems and can't find anything resembling my problem.

I am kinda stuborn. I don't like to spend money on books. I figure that if someone put her together on an assembly line, I can atleast tear her down and put it back together. I have rebuilt several JD crawlers (40's, 410's, and 440's). I have now fell in love with the N-series tractors and picked up a few for parts and restoring later.

My dad passed away a couple of months ago, and although he taught me how to rebuild motors and transmissions, we never made it to the hydraulics on a Ford tractor. I can build just about any gas engine there is with my eyes closed, but am lost on this Hyd. system.

Thanks for any help, Bob

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Rick

10-19-2000 04:50:19




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 Re: 3-pt lift falling! in reply to Bob C, 10-18-2000 18:48:59  
Bob
A gentle man by the name of "Zane" is our hydraluics expert. He will tell you to first look in the right hand inspection plate, with something attached to your lift(harrow or something) look for leaks. Once in there you can see your piston and othe areas for potential leaks. If you see none, then it might be in the saftey relief valve. The best thing to do is look in the Archives and search for his posting. Also if you have some special questions give him an email and he will help you. He is a very knowlegable person.
I had the same thing, I replaced the safety relief valve and my hydralics stay up once the clutch is pushed in. I needed it fixed so I could mow hay.Good luck

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Dell (WA)

10-19-2000 00:22:26




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 Re: 3-pt lift falling! in reply to Bob C, 10-18-2000 18:48:59  
Bob.....you're not going to like what I'm going to tell you, but seriously, get an I&T FO-4 repair manual. $25 cheep, get one!!! There are somethings in life that are a whole lot eazier with a little "guidance".

The reason your hydraulics drop is "gravity". N-Hydraulics are power up, gravity down.

There is a 1-way check valve in the hydraulic pressure relief valve that is probably getting "stuck". If you can't fix it by replacing your dirty ol' tranny oil. Then you're going to have to R & R.

Ford/New Holland now recommends 5 gallons of type M2C-134D hydraulic/tranny fluid. Drain all 3 drains and fill up by the tranny shifter. Of course if you want to, you can use the 60 yr old recommendation of 90Wt gear oil, if you can find it. I am very satisified with M2C-134D in my '52 8N..... ...Dell

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Dell (WA)

10-19-2000 00:20:24




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 Re: 3-pt lift falling! in reply to Bob C, 10-18-2000 18:48:59  
Bob.....you're not going to like what I'm going to tell you, but seriously, get an I&T FO-4 repair manual. $25 cheep, get one!!! There are somethings in life that are a whole lot eazier with a little "guidance".

The reason your hydraulics drop is "gravity". N-Hydraulics are power up, gravity down.

There is a 1-way check valve in the hydraulic pressure relief valve that is probably getting "stuck". If you can't fix it by replacing your dirty ol' tranny oil. Then you're going to have to R & R.

Ford/New Holland now recommends 5 gallons of type M2C-134D hydraulic/tranny fluid. Drain all 3 drains and fill up by the tranny shifter. Of course if you want to, you can use the 60 yr old recommendation of 90Wt gear oil, if you can find it. I am very satisified with M2C-134D in my '52 8N..... ...Dell

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