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Ford 9N, 2N & 8N Discussion Forum
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Hydraulic's

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Lerm

01-01-2005 14:01:05




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I"m trouble shooting my Hyd system on my 51 8N to locate the reason it"s not lifting/lowering ?, I"ve removed the pump cleaned it inside and out and all parts seem to be fine. I reinstalled it and now I"m looking at the lift cover assembly. My question is concerning the piston and the connecting rod. There is no pin to secure the rod to the piston ? how does the piston move in and out of the Ram cylinder, Could this be my problem because the piston seems to be frozen inside the Ram cylinder ? Any info is greatly appricated.

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Russ in SoCal

01-01-2005 20:40:59




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 Re: Hydraulic's in reply to Lerm, 01-01-2005 14:01:05  
Lerm,
Steve gave the best advice on finding out what"s wrong. Zane (author of the article) has been fixing these things since half the farmers still referred to the round rubber things in each corner as "hooves." On the left side of the case, one of the holes toward the front ain"t a bolt hole. It"s where the fluid is pumped up to go to the piston. On your cover, you"ll see a corresponding hole that doesn"t go through. That"s a passage that goes through the cover to the middle and exits in between the cover and the piston. Of course there"s a hole in the piston which goes into the cavity behind the piston. You can use air pressure to move the piston out of the cylinder, but you really don"t want to do that cause then you"ll have to figure out how to compress the rings and get it back in for troubleshooting. While you have the cover off, stick your finger down to the bottom below the oil and see if there is any mud down there. If there is, you will want to drain the oil and clean out the case real good. Kerosene is good for cleaning but I use diesel cause it"s cheaper. It"s hard and takes a while but your tractor deserves it.
Russ

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Russ in SoCal

01-01-2005 20:45:04




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 Whoops! in reply to Russ in SoCal, 01-01-2005 20:40:59  
Typin too fast. I meant ".....between the cover and the cylinder. Of course there"s a hole in the cylinder which goes into the cavity behind the piston."



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SteveB(wi)

01-01-2005 15:22:49




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 Re: Hydraulic's in reply to Lerm, 01-01-2005 14:01:05  
Go to the lower left hand side of this page Under Reasearch & Info/Articles. the very first article is troublshooting the 8N lift by the master Zane.



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Dan

01-01-2005 14:07:16




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 Re: Hydraulic's in reply to Lerm, 01-01-2005 14:01:05  
Gravity on the lift arms keeps this "dog bone" pressed to the piston. When you move the position control to lift the arms, the hydraulic oil is fed to the ram cylinder in front of the piston - forcing it to move towards the back (open end) of the ram cylinder. This action pushes the dog bone back and twists the rocker shaft which in turn lifts the lift arms.

In short, it does not need to be connected. What you are seeing is normal.

HTH,
Dan

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