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Basic Hydraulic System Help

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D13

02-24-2007 09:51:57




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Cobbled system to give Allis B live hydraulics. GM power steering pump, Gresen open center valve, 1" in/out and 3/4" working.
1. There is a pipe plug on the end of the valve. Is this a pilot port, a remote tap, or something else?
2. The system has what appears to be a flow or regulator between the pump and the valve (on the pressure side). Any guesses why? is it possibly a minimum pressure maintainer to keep the pump from working too hard? THe outlet on the pump is 1/4" and it seems like that ought to limit the flow.
3. The pump has a 3/8" falre fitting on the outlet. Anyone know a source for and adaptor to 3/8" or larger FPT (so I can put real hydraulic hoses on it)?

Many thanks for all input.

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J Schwiebert

02-24-2007 10:08:40




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 Re: Basic Hydraulic System Help in reply to D13, 02-24-2007 09:51:57  
Let me attach the Gresen valve first. Do you have a casting number? Also I think you are proably refering to a Gresen single spool model 400 valve. If so is the pipe plug on the left side of the handle or what do you really call the end of the valve. If that is what you are refering to iit is the plug that holds the relief valve in place.If this is a normal GM power steering pump there is also a relief valve inside the pump. Are you running a reservoir. What amount of flow and pressure are you really looking for? For the flow you have 3/8 inch or maybe even 1/4 inch work port hoses would do just fine. There are rules of thumb or engineering guideliness for selecting the sizes of your hoses. More questions.

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D13

02-24-2007 11:46:33




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 Re: Basic Hydraulic System Help in reply to J Schwiebert, 02-24-2007 10:08:40  
You're spot on with the valve. So I shan't mess with it. Yes I know it's wy too big for the system but the price was nice (came with the tractor).
Pump is 60's GM as far as I can tell, cast iron pulley with integral reservoir. Part of the reason I'm redoing this (other than all the leaks and boogered up engineering) is that when the fluid gets hot the expansion overflowed the integral reservoir (giving the entire side of the tractor and the valves a bath). I'm going to add a square tubing reservoir to the system, and replace much of the hose with steel hard linse to help in heat dissapation.
I'm looking to run a single 2 1/2 x 8 double acting cylinder or at most a 3 x 12 double acting. Originally had a 4x16 on it which was way more than needed. Don't need a ton of speed, mostly used on a front mounted grader blade, and perhaps I'll make a little 3 point for it. So mostly it's frequent small changes.
I'll try to get the crud off the regulator but so far I haven't been able to find any identifying marks.

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Gerald J.

02-24-2007 15:24:51




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 Re: Basic Hydraulic System Help in reply to D13, 02-24-2007 11:46:33  
You need at least as much reservoir volume as cylinder volume with a single acting cylinder. With a double acting cylinder you need at last as much reservoir volume as the piston rod volume. And those are the minimums to supply only the oil used in the cylinder. You need more to fill the lines and to cool the oil.

Gerald J.



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