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Normal 3-point hitch operation?

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Aaron Treble

07-26-1999 19:11:55




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I recently purchased a Ford 8N tractor, and don't know very much about it. It runs fine, but I'm not sure what normal operation for the 3pth is. The 3pth doesn't seem to want to lift my bushhog unless the tractor is in neutral. After it is raised completely, if I shut the tractor off, the bushhog slowly (30 seconds) drops to the ground. Is this normal or do I have a hydraulic problem? Also, keeping the bushhog at a set height while driving presents a problem, it wants to either go up or down, leaving me continuously watching behind me and making very, very small adjustments to the lever. Any help would be greatly appreciated, and if I do have a problem, where do I start looking for the problem?

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Dave Todd

07-27-1999 15:20:35




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 Re: normal 3-point hitch operation? in reply to Aaron Treble, 07-26-1999 19:11:55  
On the 8n, there is a small lever under the seat on the right side. Make sure it is pointing straight up. Then it is set for position controle. If it is already pointing up, then you must have a real bad leak either in the cylinder or the presure relief valve, or both. Also might have badly worn linkage inside, or way out of adjustment. Get yourself a shop manual and read up on how the linkage is to be adjusted. While you have the inspection cover off, you can check to make sure the linkage is properly adjusted. Hope this helps. Dave

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Trapper

07-27-1999 08:44:50




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 Re: normal 3-point hitch operation? in reply to Aaron Treble, 07-26-1999 19:11:55  
On an 8N the hydralic pump ONLY runs w/ the clutch out, w/ it's in neutral or a gear.
The pump will only lift and gravity lowers the 3pt, no down pressure.
And yes, Neil is right, 30secs is way too fast for a 3pt w/ the pump not running... When it was new, that time was measured in hours, not seconds....



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Neil (OH)

07-26-1999 19:24:19




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 Re: normal 3-point hitch operation? in reply to Aaron Treble, 07-26-1999 19:11:55  
Thiry seconds for a drift down is quick. Check
the pressure relief valve (you can see if it is
leaking by removing the right side access cover..
it is below the fluid at the rear of the pump.).

The other possibility is that you have a leaking
cylinder. You can also inspect this when you
have the cover off. It should drip just a few
drops of oil in ten seconds. If leaky, it will
pour out.

A very good way to hold the mower at the desired
height is to use two chains which attach to the
top link shackel by means of adapter plates.
Once set, you put the position control down and
the chains take the weight. This saves wear on
the hydraulics.

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Fred

07-27-1999 07:39:07




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 Re: Re: normal 3-point hitch operation? in reply to Neil (OH), 07-26-1999 19:24:19  
Neil. Do you know of a supply source for the adapter plates that you mentioned for the limiter chains? I would like to go that route on my 8n. Thanks



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Ron from IL

07-27-1999 10:30:46




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 Re: Re: Re: normal 3-point hitch operation? in reply to Fred, 07-27-1999 07:39:07  
Fred,

I'm not Neil, but you can get the limiter chains from Stevens, CT, TSC, or other parts suppliers. Or make them yourself (a couple of pieces of 1" X 1/4" strap, a drill, and a torch or grinder--they're nor rocket science!). Ron



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Mike C - Seven Fountains VA

08-02-1999 06:56:19




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 Re: Re: Re: Re: normal 3-point hitch operation? in reply to Ron from IL, 07-27-1999 10:30:46  
Another alternative, which is a lot easier, is 1/4 or 5/16-inch steel cables, looped twice with 2 or 3 wire nuts at each end. I put a pair of caribiners at the tractor end of the cables and mounted them permanently on the bush hog end with a couple pieces of old harware. This rig can easily be adjusted in length until you get it right. The caribiners snap on and off by hand, so it only adds about 20 seconds to the rig-up time for the hog.

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