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Discussion Forum

Adding hyd valve to jd 300

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Al

02-08-2002 08:46:05




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Anybody done it?Is it a open or closed center system?
Al




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Kent

02-08-2002 14:43:30




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 Re: adding hyd valve to jd 300 in reply to Al, 02-08-2002 08:46:05  
Hi Al. I'm pretty sure it is an open center system. I would guess that you would just tap into the supply & return lines that go to the factory lift valve, as that would give you constant hydraulic oil flow. Anyway, I hope this helps.



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Al

02-08-2002 17:40:55




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 Re: Re: adding hyd valve to jd 300 in reply to Kent, 02-08-2002 14:43:30  
Thanks for the reply Kent.I am building a 3pth,and need to run a cyd for the hitch.The tractor is a h2,one valve having a float feature.One option is to re-route the float line to the rear to power the hitch.I also thought I could get a 2 spool valve,with 1 float,& power beyond and put this valve in line ahead of the factory valves(running the factory valves from the power beyond ports)This would retain the dual frount hyd.as well as giving one rear and the 3pth.

what ya think?
Al

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Kent

02-08-2002 19:03:14




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 Re: Re: Re: adding hyd valve to jd 300 in reply to Al, 02-08-2002 17:40:55  
Hi Al. For the factory JD 3pt hitch lines, you just Tee'd off one of the factory ports off of the valve. You could use either valve, but if you used the one that also runs the rockshaft for the mower deck, you'd have to make/buy the lock out link that keeps that cylinder from moving, so the oil would go to the rear couplers. On my 140 H-3, I have the rear lines hooked up to the outside lever that runs the left front outlets (I believe your 300 is just opposite, but I'd have to check). The center lever (which has the float function) runs the right front outlets, and the inside lever runs the rockshaft underneath. Hooked up this way, I can't use my front blade & rear outlets at the same time (as I have the hyd. angle front blade), but I don't think that I would have a use for using both at the same time. I think you have a good idea, but unless you think you would be using all the hyd. functions at the same time, you might just want to Tee off the factory valve & run lines to the rear, as that would be a lot cheaper than buying & installing the extra valve. I guess it really depends on how you will use it. Anyway, I hope this helps.

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Al

02-09-2002 04:46:19




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 Re: Re: Re: Re: adding hyd valve to jd 300 in reply to Kent, 02-08-2002 19:03:14  
Hi Kent,
I like what you say,cost wise to,but I am not clear on how to keep the 3pth from cycling if using the front remote.I'm thinking a pin to lock the hitch in the up position then unplug it's cyl.I have never seen a factory set-up,these machines a rare in my area and the dealer don't have staff that even remember the 70's.
Thanks
Al



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Kent

02-09-2002 14:10:48




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 Re: Re: Re: Re: Re: adding hyd valve to jd 300 in reply to Al, 02-09-2002 04:46:19  
Hi Al. If you want, go over to the weekend freedom machines JD garden tractor site & look in the model info section under factory attachments, there should be a picture there of a 140 3pt setup, and maybe also a pic under 300 series. Basically they were the same hitch, except for the 300 series they were notched for gas tank clearence & the hoses hooked up just above the hitch plate, rather than through the rear of the fender deck like my 140. Since I take it you are building your hitch, I would suggest going the route of making it pinnable in a somewhat raised position to unhook the hoses, or make/buy some spacers to fit around the ram when it is in the position you want, then unhook the hoses. My dad does this alot on some of his farm equipment, using a piece of channel iron that will fit around the ram far enough that it has 2 hole drilled through it for a small pin to keep it on after it is placed around the ram, meaning the two sides are deep enough to allow this. Hopefully you understand what I mean. I also know that farm stores sell some aluminum round pieces that are split & held together with a spring, so you spread it apart to fit it around the ram & then it snaps shut. These come in 1/2", 1" and other assorted hights. I hope this helps.

Kent

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