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Ford 9N, 2N & 8N Discussion Forum
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Hydralic Relief Valve Replacement

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GAJIM

08-18-2005 14:38:45




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I need to replace a leaking hydralic safety relief valve on my '52 8N and have one on the way from a Carolina based supplier. About a year ago, I replaced the PTO shaft assembly, cam folower pin, hydralic cylinder, & piston with the newer NAA o-rings & backup washer. The hydralics still work good with a heavy bush hog, box blade, etc. but will leak down when the pump is not pumping.

Can you swap out the safety valve through the right side inspection port without pulling the PTO shaft or draining the hydralic fluid? Or, do I need to bite the bullet & drain the fluids, open up the inspection cover, and pull the PTO shaft? Thanks in advance. GA Jim

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don t.-9n180179

08-19-2005 10:32:18




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 Re: Hydralic Relief Valve Replacement in reply to GAJIM, 08-18-2005 14:38:45  
A few years back someone posted a pix of the home made wrench they made. I've still got it but Im a moron when it comes to "baby puters" (i work on mainframes).
Basically, lay a wrench flat and cut it in half.
Put the box end at a 90 to the open end and weld together.
HTH....good luck...don t. ...



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KenA-OK

08-19-2005 03:17:32




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 Re: Hydralic Relief Valve Replacement in reply to GAJIM, 08-18-2005 14:38:45  
There was a post a while back about pulling the PTO shaft and using a universal joint type socket attachment on the end of a ratchet wrench extention bar to remove the valve, The only problem is you need the inspection cover off to have the wife stick her hand in the fluid to guide the socket on to the valve. Well you know how that went over! I still havent changed mine out . I put it all back to gether and decided to wait until I bought the combo wrench and did it Zane's way. That was last summer. I will try again in Sept when mowing season is over.

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ZANE

08-18-2005 15:50:49




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 Re: Hydralic Relief Valve Replacement in reply to GAJIM, 08-18-2005 14:38:45  
Remove the left side inspection/PTO shifter cover plate and bend an 11/16" box end wrench into a boomerange shaped 90% angle. Reach under the PTO and remove the relief valve and spring and check valve and replace in about 10 minutes.

Zane



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Russ SoCal

08-18-2005 17:54:12




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 Kinda like one of these in reply to ZANE, 08-18-2005 15:50:49  
Used to call these generator wrenches.



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GAJIM

08-18-2005 18:11:04




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 Shoulda Bought One Tonight in reply to Russ SoCal, 08-18-2005 17:54:12  
Russ: Thanks for the link to the Chinese Tool Store. I stopped by our local cheapo Chinese tool store after work today. Shoulda bought the curved wrench set for $9.99 while I was there. I rather spend 10 bucks for some throw away tools than mess up one wrench from one of my good set of box end or combination wrenches. Thanks again! GA Jim



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GAJIM

08-18-2005 17:51:34




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 Question for Zane in reply to ZANE, 08-18-2005 15:50:49  
Zane: What's the best way to bend the wrench? A big vise & a BIG hammer? Put the wrench in the vise longways & crank the vise down? Heat it up and beat it on my anvil? Thanks for your incredible knowledge and your willingness to share it! GA Jim



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ZANE

08-18-2005 19:08:41




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 Re: Question for Zane in reply to GAJIM, 08-18-2005 17:51:34  
I usually heat it and bend it in a vice by either hammering it over or just using a length of pipe etc over the end of the wrench after it is almost red hot.

Or if it is some sort of steel that doesn't like to be bent hot and breaks then I just weld it back together at the angle I want.

Actually you can just cut it off short enough that it will clear the side of the lift housing and use a long hammer handle or a steel drift to place on the end of the wrench and back it off. Once it is moved just a little you can take it the rest of the way out by hand. It is a pipe thread so it loosens quickly.

Zane

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Russ SoCal

08-18-2005 17:59:43




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 Re: Question for Zane in reply to GAJIM, 08-18-2005 17:51:34  
Jim.
Lotsa heat. Udderwise, wrenches are made to snap just before you get it bent just right.
R



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Jerry (AL)

08-18-2005 15:13:17




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 Re: Hydralic Relief Valve Replacement in reply to GAJIM, 08-18-2005 14:38:45  
Think it would be a lot easier with that PTO shaft out. Some say you can get it with a bent wrench through the side plate. I got mine with a little small crescent and some umph.

Might be able to nose your tractor over into a pretty good ditch in the front and pull that PTO without losing all your fluid.



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GAJIM

08-18-2005 18:15:53




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 Re: Hydralic Relief Valve Replacement in reply to Jerry (AL), 08-18-2005 15:13:17  
Jerry: Good idea to put the N nose down in a ditch to save the fluid. I did that when I changed the PTO shaft assembly out & didn't lose any fluid. I think I will try puttin the N nose down in the same ditch, pull the left side cover, and then use one of the newly acquired el cheapo Chinese tool store curved wrenches. According to Zane, this should be about a 10 minute job. You can't beat that. Thanks. GA Jim

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Jerry (AL)

08-18-2005 19:32:18




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 Re: Hydralic Relief Valve Replacement in reply to GAJIM, 08-18-2005 18:15:53  
If you get the wrench right like Zane said, you might not have to pull the shaft. You can reach under that shaft and feel for it and might get it if you hold your mouth right as my daddy used to say.



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