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Farmall & IHC Tractors Discussion Forum
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Orings on a IH 300u

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JayWalt

10-09-2006 20:07:58




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Hey guys,
Today I went to plumb in my new dump cylinders on my 300u. I had to remove the valves to get access to the fittings under them. The orings in the valves (the 3 on each "plane" that allows for valve stacking) are kinda flat. I cleaned them up, petro jellied them and re-assmbled. Does anyone know what size orings these are? I'm assuming they arent supposed to be flat. Ideally next spring when I plumb in my selector valves and fasthitch cylinder, I'd like to replace them. If I still had it part, I could match them up, but I wanted to get it re-assembled today.
Also, The valve for the single acting lift rams has nothing but a valve.
The valve for the fasthitch (and now the dump cylinders) has a device between the resevoir and the valve. Is this a regulator or a check valve? There is also another device bolted to the bottom of the valve and the hoses run off of it for the cylinder. Just wondered why the other valve doesnt have these? Also, I swapped the whole assemblies around on the resevoir. I'm assuming that it doesnt matter, I did those for hose length and handle location. Please let me know if the rear/front valve mounts on the resevoir do the same thing, or if I'm in for some trouble.
Also, I have been repeatedly told that any standard oring (like for faucets/water) are suitable for hydraulics. I dont believe this, as in my R/C hobby they only use silicone oil in the difs (oring sealed), because petroleum based lubricants (oil) causes the orings to swell and deteriorate. Is there any truth to this? Last time I needed orings, I went to the deere dealer and spent about 4x as much on them...
Thanks Guys!

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tprexhurst

10-09-2006 21:08:53




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 Re: Orings on a IH 300u in reply to JayWalt, 10-09-2006 20:07:58  
I am doing some hydraulic work (adding Power Steering) to my 300 RC. I called a local - sort of - Case/IH dealer and asked him if it needed special O rings. He told me that standard off-the-shelf (of the correct size) would work fine. We'll see if it leaks when I get it all back together and start 'er up. . .
Texp



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TDK

10-09-2006 20:31:55




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 Re: Orings on a IH 300u in reply to JayWalt, 10-09-2006 20:07:58  
Jay, I can't tell you the size of the o-rings, but they are a standard size and can be purchased from any auto parts store. If you can't find the size, then just take one with you. The pressure regulator is between the fasthitch valve and reservoir. The block on the bottom of fasthitch valve is the check valve. When you say "swapped the assemblies around", I assume you mean that the front one now operates the fasthitch. Correct ? Swapping the valves shouldn't harm anything, but I don't think you can move the regulator valve.

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JayWalt

10-10-2006 02:26:35




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 Re: Orings on a IH 300u in reply to TDK, 10-09-2006 20:31:55  
I swapped the whole assemblies, the valve, reg, check valve are all in the front now and the single valve is in the back spot.
What is the point of the check vavle?
Why is there a regulator on the hitch cylinder and not one on the lift rams?
Thanks



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TDK

10-10-2006 21:21:58




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 Re: Orings on a IH 300u in reply to JayWalt, 10-10-2006 02:26:35  
The check valve does just as JimN said. The regulator is not for lift only, it regulates pressure for all the valves.I may be wrong about it only working correctly on the rear of reservoir. It may work on front as well. Let me and everyone else here know how it goes !



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Janicholson

10-10-2006 18:19:22




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 Re: Orings on a IH 300u in reply to JayWalt, 10-10-2006 02:26:35  
I believe that the best o rings are teflon based rings, pricy, but pretty much for ever. Standard rings are made from (usually) buna-N, which is a synthetic oil resistant rubber like material. They are OK but do take a set. Sink "O"rings are rubber/neoprene and often melt or turn to expanded jelly in petroleum based oils. The check valve in the hitch cylinder line is (I believe) to prevent catistrophic sudden lowering of the implement/hitch. Which would not be reasonable to put in a valve system hooked up by the user for other purposes. My best info, JimN

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