Pressure relief valve

hdltch

Member
Can I replace the hydraulic pressure relief valve with removing the hydraulic pump on a 8n tractor. Thanks
 
Yes.

Alternatively, you can R & R it through the side inspection covers if you have patience, the right tools and your hands are not too large.

Of course, you can remove the lift cover to make it quite easy.

Dean
 
YES. You will need an 11/16" open end stub length wrench or take an old one that has no sentimental value to you and chop saw it down to about 4-6 inches. I wrote an entire article on how to repair the 8N hydraulic system on a budget -my email is open so reply and I can send it to you. You will need Adobe to open it a sit is pdf format. You can get free download of Adobe if you don't already have it...


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<font color="#FFFFFF" size="3">*9N653I* & *8NI55I3*</font>​
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I wrote an entire article on how to repair the 8N hydraulic system on a budget

I have wondered how a pressure relief valve fails and are there repairable ? Seems it is a valve with a spring to load it closed and should reset itself . I guess the spring fatigues and will no longer hold correct pressure ? I don't recon they are like a fuse and become inoperable after a single use ? Just throwing this in the air as someone may have studied it in depth . I have a lot of used pressure relief valves I need to check out before I toss them ($).
 
(quoted from post at 12:53:38 02/08/17)
I wrote an entire article on how to repair the 8N hydraulic system on a budget

I have wondered how a pressure relief valve fails and are there repairable ? Seems it is a valve with a spring to load it closed and should reset itself . I guess the spring fatigues and will no longer hold correct pressure ? I don't recon they are like a fuse and become inoperable after a single use ? Just throwing this in the air as someone may have studied it in depth . I have a lot of used pressure relief valves I need to check out before I toss them ($).
ith N's it is a combination valve, over pressure release AND check valve. Yes, over pressure is ball &amp; spring. Sometimes the "failure" is as simple as trash captured between ball &amp; seat. Others are corrosion, spring failure. Problem with repair is that once disassembled, unless you have a pressure source to calibrate it, you will have no way of knowing the relief pressure.
 

I had to replace my control rod and cam pin so I pulled the top cover off. I also purchased a new relief valve and NAA piston as long as I was in there. I did not remove the pump itself. I did remove the PTO shaft since I was replacing it with a new 1 3/8" shaft.

Anyway, when I removed the old relief valve I did not have a set of stubby wrenches. But here's the thing, I was able to remove and replace the relief valve using a regular combination wrench sticking through the dipstick cover plate hole. You can only turn it like a quarter turn at a time but it did work. I don't think I could have done it had the PTO shaft not been removed. My old valve came out in two pieces. the plunger was left in there and I had to fish it out with tweezers. Of course the oil had been drained and I could see what I was doing in there.

You can probably do it with the PTO shaft in there if you use a stubby wrench.

Oh yeah, I did buy a set of stubby wrenches after that.
 

Thanks , that clears up any confusion I had . I had built a T tester after seeing one John Smith ? maybe , made and posted a picture . I have not used it but will get too it hopefully soon .
 

Thanks , that clears up any confusion I had . I had built a T tester after seeing one John Smith ? maybe , made and posted a picture . I have not used it but will get too it hopefully soon .[/quote]es, John comes up with some nice/special tools! I always like a line that I believe he has used, "there is a tool hiding inside every old axle....all you have to do is remove all the metal around it"....or something like that.
 

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