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It's a bird...It's a plane...My front loader bucket!

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Dennis (WI)

05-23-1999 06:20:18




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I had my hyraulic pump out and order gaskets for the two pump housings and a safety release valve...I put on the new gaskets.....BUT the valve I ordered didn't fit....the threading was wrong...
(earlier posting) I left the old one in and put it all back together. Boy was I proud as the the loader went up! Then I moved the control lever to lower it... and it kept on going UP! I tried moving the control down to the DOWN position...BUT up it went higher and higher! The whole thing ended with a fountain spray of fluid spewing out of the right side of the pump housing AGAIN...I am assuming the check valve stuck and blew the gasket again...I checked the serial # to find the tractor is NOT 1952 8N but 1951. Is that why the check valve I ordered didn't fit? Can I change the valve without pulling the pump again (hope)? Am I right in asssuing it IS the safety relief valve that is stuck? Is there a 8N Hydraulic Depression Support group in my area???

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llamas

05-24-1999 03:20:21




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 Re: It's a bird...It's a plane...My front loader bucket! in reply to Dennis (WI), 05-23-1999 06:20:18  
The two are likely not connected.

If it keeps going up, it's pretty simple - the exhaust valve is not opening, or the exhaust port/galleries are clogged or otherwise blocked. Did you check/adjust the control valve linkage? Are you sure that the linkage is engaged properly in the valve bell-crank?

You are not the first person lately to report difficulties with the threads on new check/relief valves. Although I haven't seen it myself, several persons whose observations I trust have reported that new valves have apparently mismatched threads. It would seem that there are incorrectly-made or incorrectly-stocked parts in the supply chain. A new valve should thread in closely but smoothly all the way to the seat.

llater,

llamas

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Dennis (WI)

05-24-1999 06:04:03




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 Re: Re: It's a bird...It's a plane...My front loader bucket! in reply to llamas, 05-24-1999 03:20:21  
I didn't visually check the control rod's position in the bell chamber - when the problem first started a turned off the tractor and felt down into the fluid....and it SEEMED to be seated? I DID notice, while feeling around that when I moved the touch control back (lifting) the rod went down...Then when I moved it forward (lowering) the arm started moving up and then moved back down as I continued to move the touch control full forward). How does all that sound to you????

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llamas

05-25-1999 02:59:07




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 Re: Re: Re: It's a bird...It's a plane...My front loader bucket! in reply to Dennis (WI), 05-24-1999 06:04:03  
How it sounds is wrong.

When you lift the touch lever, the lower end of the control arm should move to the rear of the tractor - it pulls the inlet valve rearwards (open) and , via the bell-crank that connects the two valve spools, moves the exhaust valve forward (closed).

If you have up-and-down movement, something isn't happening right. Suggest you drain the oil (so you can see what's what) and explore the valve/control linkage motion with the I&T manual at your side.

llater,

llamas

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bg

05-23-1999 11:25:36




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 Re: It's a bird...It's a plane...My front loader bucket! in reply to Dennis (WI), 05-23-1999 06:20:18  
The safety valve is the same for the 9N/2N/8N -#8N638. I assume you're running the loader from the outlet port on the pump housing? Have you checked the exhaust valve? I tried to email, but it didn't work-bad address.



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Dennis (WI)

05-23-1999 16:05:23




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 Re: Re: It's a bird...It's a plane...My front loader bucket! in reply to bg, 05-23-1999 11:25:36  
Yes the loader is working off the outlet port. I am almost certain that the release valve I got with the part # you mention had diffrent threading then the female threading on the pump. The threading on the vlave seemed larger and it wouldn't tighten in. ? I had the pump out and looked at the exhaust valve...it did have some minor scoring on the valve shaft.....? Maybe I should just replace all the valves?? Any more ideas about why the safety valve I tried to install seemed to be threaded diffrently??

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bg

05-23-1999 17:01:21




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 Re: Re: Re: It's a bird...It's a plane...My front loader bucket! in reply to Dennis (WI), 05-23-1999 16:05:23  
No experience in that area, but to hazard a guess...you got the wrong part from NH, which is quite possible with the NAA 638E and NCA638C and 8N638 numbers, computers and current crop of parts people.



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Jim

05-23-1999 06:48:53




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 Re: It's a bird...It's a plane...My front loader bucket! in reply to Dennis (WI), 05-23-1999 06:20:18  
Sounds to me like you have a return hose in the wrong place or a valve problem. Is the valve that raises and lowers the loader seperate from the internal tractor hyd valve? You definately have a "relief" valve problem because it should have popped when the cylinders reached their limit of travel!



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