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Tractor Talk Discussion Forum

making a hydraulic valve spool

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markct

08-25-2004 11:59:27




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i was just wondering if anyone has ever made a replacement hydraulic valve spool, i have a hydreco valve bank for our loader backhoe that has a broken spool, its an odd diameter (55/64") and parts are no longer available, neither is hard chromed rod in this size, so i have been considering making one outa stainless steel and lapping it with a brass od lap to get it to the exact size, i know that stainless will be a little harder on seals over time but what i plan to do is swap one of the spools from the two that are used for the stabilizers so that the stainless spool will be on the stabilizer circuit where it doesnt get used as often as the other backhoe funtions. i just wondered if anyone has ever done this sorta thing before. i am a machinist by trade but dont have access to an od grinder so it would be basicly just carefully turned and lapped to size. any thoughts would be apprecited, basicly all i have to lose is my time in making it but just wondered how crazy of an idea this might be lol.

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Heat Houser

08-26-2004 06:39:58




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 Re: making a hydraulic valve spool in reply to markct, 08-25-2004 11:59:27  
I wouldn"t swap spools with another function unless the metering cuts on the spool lands are the same. The metering cuts allow you to "ease" into cylinder movement. If they are not the same, controlability may become an issue with jerkyness.
The swapped spool may also bind in the new bore due to differences in fit up. I would make a new spool to replace your existing spool. What is your old spool made from? Does stainless have the same or better yield strength? The pressure working on the lands may fail the "necked down" portions of the spool by simply pushing them apart.

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KURT (mi)

08-25-2004 17:26:54




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 Re: making a hydraulic valve spool in reply to markct, 08-25-2004 11:59:27  
Making your own hydraulic valve spool would be difficult, but not impossible. I am a toolmaker--10 years ago I used to work for a company as a prototype technician and I used to make prototype valves in the machine shop. (these were for small transmission control valves) If I were making a large spool I would do the following. 1. get the dimensions of the valve spool you need to make. 2. turn the spool on centers. 3. make the OD to fit by continuously checking for fit to the bore. 4. emery the spool to a polished look. 5. find out what hydreco used for the steel material. Tool steel, stainless, 12L, or an alloy like 6150, 4140, 4340. I would not heat treat the spool because it will warp from heat treating and then it will not slip into the bore. Let us know what you will decide.

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Dick L

08-25-2004 18:40:37




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 Re: making a hydraulic valve spool in reply to KURT (mi), 08-25-2004 17:26:54  
Might I suggest that he looks for an ejector pin for plastic molds in the out side diameter needed and grind the grooves in a spin index. The outside of the ejector pin will be hardened and designed to slide back and forth. They come in many diameters.
If I was making one from scratch, I would use pre hard H-13 tool steel. turn it out and finish grind it in a spin index with fluid.

Pre hard H-13 is what we use for over size and odd sized ejector sleeves. We have some still running that we made in 1989. We have made severl hundred thousand parts with that mold.

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markct

08-26-2004 05:50:26




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 Re: making a hydraulic valve spool in reply to Dick L, 08-25-2004 18:40:37  
i cant use a hardened pin because i need to do internal threading and boring on this spool, it has some kinda check valve type thing in each end



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Davis In SC

08-25-2004 18:50:44




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 Re: making a hydraulic valve spool in reply to Dick L, 08-25-2004 18:40:37  
Using an ejector pin would be difficult, the nitrided O.D is tough to grind through, but not impossible. If you can borrow a tool-post grinder, spool can be ground in lathe. On subject of Plastic molds, I rebuilt one about seven years ago, it makes 96 buttons per cycle. since the rebuild, it has made over 1.3 Billion parts, with only minor repairs.



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Dick L

08-26-2004 17:51:25




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 Re: making a hydraulic valve spool in reply to Davis In SC, 08-25-2004 18:50:44  
The outside is nitrided and hard. The inside is tough but can be drilled, taped, and also threaded. I have been working with plastic molds since 1959. I have had my own mold shop since 1978 two years after I started the plastic injection molding factory. The link below is to pictures of a coupla CNC machines that I put in about two years ago.

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Jet9N

08-25-2004 17:02:35




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 Re: making a hydraulic valve spool in reply to markct, 08-25-2004 11:59:27  
I would think without a cylinder grinder it wouldbe next to impossible to get the O. D. true, since the reliefs have to be turned first so that
finishing the O. D. will straighten any distortion
any lapping would tend to "round off" the corners
of the lands.

JMHO

Jet



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