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Hydraulic spool valve help
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Ken stanwood View Drop Down
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Joined: 06 May 2012
Location: Stanwood WA
Points: 38 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken stanwood Quote  Post ReplyReply Direct Link To This Post Topic: Hydraulic spool valve help
    Posted: 17 Jan 2021 at 3:50pm
I have a D15 commercial with a loader. the spool valve is broken and not repairable. It has a port on the back of the valve that fits over a pipe that sticks out of the reservoir (the loader support) and is sealed by a rubber washer when the valve is bolted up. I could not find a replacement valve the same. Is this a return, or some kind of pressure relief? Is seems I can just plumb the valve without this and block off the pipe sticking out of the reservoir.
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Ken stanwood View Drop Down
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Joined: 06 May 2012
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Points: 38 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken stanwood Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2021 at 3:51pm
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Ken stanwood View Drop Down
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Points: 38 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken stanwood Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2021 at 3:54pm
Here is the front of the valve
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Jim.ME View Drop Down
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Points: 950 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim.ME Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2021 at 4:51pm
Without seeing your valve and figuring out just how it is ported to be certain, I will guess that port into the reservoir, which the valve slides over, is the oil return for the system.  You should have a supply line coming from the pump and you need a return to reservoir.  If it doesn't have a dedicated return hose, between the valve and reservoir, that port is the system return point.

You will need to make a mounting bracket for the valve and since the new valve will most likely have a port for a return hose, you will need to have a place to connect that return hose to the reservoir.   You could modify that port to accept a hose or make another port and plug that one.  
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Ken stanwood View Drop Down
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Points: 38 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken stanwood Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2021 at 11:07pm
The original valve does have a return port.
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Ken stanwood View Drop Down
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Points: 38 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken stanwood Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2021 at 11:09pm
Thank you for helping.
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Jim.ME View Drop Down
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Points: 950 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim.ME Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2021 at 5:22am
Since your existing valve already has a separate return hose you can use that for the return from the new valve and plug the port, shown in your pictures under the old valve.

You didn't say, and I didn't ask, but is this just a loader tractor or does it have a backhoe on it as well?  That could make a difference if there is a power beyond set up.


Edited by Jim.ME - 19 Jan 2021 at 5:25am
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Ken stanwood View Drop Down
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Points: 38 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken stanwood Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2021 at 11:10pm
I think it may have had a hoe on back in a different life but not now.
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Coke-in-MN View Drop Down
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Points: 41563 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jan 2021 at 11:14am
Is it a open center valve body with that being the return line back for flow when NO supply is needed to cylinders ?
A valve body with how many outlet ports ? Big thing is getting a valve body rated for the pump capacity along with if oil is ported so as to have regenerative circuit within . 
 AC used a retentive system where oil from one movement of cylinders flowed into opposite end of cylinder when designing their backhoe operation. 
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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