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8N hydralics

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Norman

09-18-2002 11:34:39




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The hydralics won't lift. Won't even try. The pump is turning. No turbulence at the pressure relief valve. The valves do opperate when you pull up and down on the control. Took the top off and there is no oil coming up thru the oil line to the lift cylinder. How do I check the pump? I don't have it off yet. There is no change in the sound of the tractor when you engage or disengage the pump/pto lever. Any help will be appreciated. I do have a repair manuel.
Thanks, Norman

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Evil Steve

09-18-2002 11:45:17




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 Re: 8N hydralics in reply to Norman, 09-18-2002 11:34:39  
From your description, you already DID check the pump. No pumping hyd fluid to the lift cyl means bad pump. Need to pull it outta there and rebuild it.



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Norman

09-18-2002 11:57:32




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 Re: Re: 8N hydralics in reply to Evil Steve, 09-18-2002 11:45:17  
Thanks Evil. I was afraid of that. My good deal on this tractor is slowly fadeing away. Thanks again
Norman



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48nTom

09-19-2002 11:56:00




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 Re: Re: Re: 8N hydralics in reply to Norman, 09-18-2002 11:57:32  
Norm,
My N's symptoms were similar to yours. After thinking about it a long time, having a shop tell me I needed the pump rebuilt, waiting even longer, I asked some mechanic friends for possible solutions. The first thing I tried was to replace the pressure relief valve. Doing that, I found a broken bolt which turned out to be from where the lift arms attach to the cylinder rod. I pulled off the upper hydraulic unit to replace the bolt (supposed to be a clevis pin, but I couldn't find the right size) and checked the condition of the cylinder bore at the same time. I couldn't move the piston with my fingers, so I used a tiny blast of compressed air to do the job. Oil squirted all over the place when I pushed the piston back in. Satisfied the cylinder was okay, I put the top unit back on and hoped for success. The darn thing just wouldn't lift a load unless I helped. I had to purge the air from the system by raising the lift arms manually-every time I wanted to use the tractor. I knew I had a problem with the pump, but being cheap, the decision was make to pull the pump myself and check it out.

I pulled the pump two nights ago. When I turned the device that the pto shaft would normally turn, I found a leak in a gasket on the body of the pump. So, at the local Tractor store that specializes in old Fords, I bought a gasket set for the hydraulic system. I cleaned the surfaces really well, and even checked them for flatness. Bolted it all back together and tried it out. It sort of surprised me that the system was fixed saving myself hundreds of dollars. It only took a few hours, too. I'll end up using only 3 gaskets out of the whole kit (I haven't put the inspection cover back on yet), but I'll have the rest of the set for another time.

So the point is, don't be intimidated by it if you have any mechanical ability at all. My pump was clean enough that all I had to do was wipe some settlings off the bottom, if yours is really gunked up, you may have bigger problems. A service manual would definitely be a plus if you don't have one. I did plan to take the tractor to that Ford store if the gasket didn't fix the problem. So far though, they're going to have to wait!

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Evil Steve

09-19-2002 08:53:02




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 Re: Re: Re: 8N hydralics in reply to Norman, 09-18-2002 11:57:32  
Norman-

Don't get frustrated. Lemme share the reason I have one of these tractors as opposed to a newer "trouble-free" (if that exists) tractor.

First and foremost is that this is a tractor that I can repair (ANYTHING) with a minimal amount of time, tools, and expense. The simplicity is this tractor is a thing of beauty to me. I wouldn't own one if I DIDN'T have to tinker with it or even do a major repair. It harkens to a time when Made in America meant it was built to last, be cheap to operate, and be repaired by its owner.

Second, I knew parts and info were readily available and cheap.

Third, it is a nice looking tractor with a market where I know I'll never be looking at selling her for less than what I paid. Anything else you can think of that can claim that?

It never occcured to me that there would be a discussion forum such as this for old N tractors. I found it a year ago just looking for some parts on the internet. What a great entertainment forum - whether technical or not about tractors.

"Chigger" does the work I need done, but could be done faster and better by many other tractors, but no tractor is as fun as her.

So try not to be frustrated. tackle that hyd pump problem (you are looking at a 1/2 - 1 day job) and enjoy sharing your experience with us!

Evil Steve

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Mountainman

09-18-2002 17:49:06




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 Re: Re: Re: 8N hydralics in reply to Norman, 09-18-2002 11:57:32  
The pump isn't all that difficult to remove - hardest part is dealing with the fluid - and may not be hard to fix. Unless you are real unlucky and have a cracked housing.

Lot's of stuff in the archives about working on the pump. Check out posts by Zane for technical info and Willy-N for photos and info. There are others with good info too.

hth

Mountainman...CA



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Brian-2N

09-18-2002 17:45:08




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 Re: Re: Re: 8N hydralics in reply to Norman, 09-18-2002 11:57:32  
Norman,
It's not as bad as it sounds. I just did mine. When you pull the pump out, there are two bolts on either side that each hold down two sets of plungers and springs. Pull out the pieces, clean those and the chambers, and re-install. It is quite easy. Most problems are due to the pump being choked with crud. For good measure I am going to replace the hydraulic pump piston (just waiting for it to show up). Change the safety valve while you're at it.

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