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John Deere 1120 3pt hitch won't lift when I hook up loa

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James1948

03-18-2023 15:36:54




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I have a John Deere 1120 with a model 37 loader.

We have never used the loader before because it was not on when we rebuilt the engine. Just a week ago we were ready to put it on and we hooked up the line to the valve control for the up and down. when we did the drive way needed plowed so when doing so the blade on the 3pt hitch was very slow and delayed. Also with a lot of weight it won't lift it. But I figured out when lifting something you pull or push on one of the loader control levers it lifts just fine. Any Ideas about it?

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James1948

03-20-2023 17:12:50




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-18-2023 15:36:54  
Thank you so much for this link I just found the model 37 loader owners manual. I was looking at the line hook up and every thing is correct except for the return line. I found out it's in the wrong spot and needs to be moved from the filter area to up to the floor boards. I have to try it when I hook it up but it may fix it.



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used red MN

03-20-2023 18:55:29




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-20-2023 17:12:50  
When you are working on it unhook the pressure line from the tractor at the add on valve. Open the filler cap to the rear end where you add oil. Or if you are changing where the oil returns leave that hose unhooked. Then use compressed air with a rubber tipped blower or a rag wrapped on an air tip, blow a short blast of air in the valve fitting where the pressure hose was unhooked. If it blows air into the trans reservoir or out the disconnected return hose your valve WILL NOT WORK correctly. It is an open center valve. You need a CLOSED-CENTER valve.

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Tx Jim

03-19-2023 10:03:30




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-18-2023 15:36:54  
This makes a bit of sense considering I'm a 13 year that's new to hydraulic systems. But I'm pretty sure it's a closed system because it's always asking for fluid by always sending it back to the reservoir. I did a test and the 3pt hitch works just fine when you disconnect the two lines and plug them. Also I forgot to add the two lines going to the control unit are shaking and vibrating.[/quote:922d804d29]

JD 1120 has closed-center hyd system. Sounds as if the 2 lines that you disconnected which allowed 3 pt hitch to operate are leading to an opewn-center valve which is incorrect valve for a model 1120

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WNYBill

03-19-2023 07:18:07




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-18-2023 15:36:54  
On my Kubota 7030 you have to hold the loader remote open for the loader to work. Other remote and 3 pt will not work while the loader is working, get a bungy cord! You can change the valves and make it an open or closed center or something, but that is above my pay grade.



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James1948

03-19-2023 06:48:11




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-18-2023 15:36:54  
sorry correction. I think it's an open center system



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used red MN

03-19-2023 14:08:28




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-19-2023 06:48:11  
You said ..sorry correction. I think it's an open center system

That is not correct. The operators manual for your tractor says on page 33 in a safety warning that your tractor has a 2250psi ..stand-by.. pressure. The term ..stand-by.. is a direct reference to the pressure held in a closed-center system against any valve that would open to use hydraulic flow and pressure. This means your tractor has a closed-center system as Jim indicated. As Jim and I said in my our replies your add on valve needs to be designed as a closed-center valve or convertible to closed-center comparability. Another item not mentioned previously is that if the add on valve has a pressure safety relief valve it needs to be set just above the tractors actual stand-by pressure so it does not constantly relieve oil back to the reservoir.

If you do not have an operators manual you can down load one from JD for free from the linked page. When you find your applicable machine type and model click the arrow pointing sideways so it points down and it shows the operators manuals and other tech manuals. Click the arrow to point down by Op manuals there you can put it in your cart. Also there is a square at the right with the arrow up to the right corner when you click that you can view it. The down arrow with the line under it will down load it to your PC.

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James1948

03-19-2023 06:11:35




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-18-2023 15:36:54  
This makes a bit of sense considering I'm a 13 year that's new to hydraulic systems. But I'm pretty sure it's a closed system because it's always asking for fluid by always sending it back to the reservoir. I did a test and the 3pt hitch works just fine when you disconnect the two lines and plug them. Also I forgot to add the two lines going to the control unit are shaking and vibrating.



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used red MN

03-18-2023 18:08:58




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-18-2023 15:36:54  
Hello James welcome to YT. To add more explanation, a closed-center system holds full pressure and stops flow in the supply hose to a valve. When the valve opens to the cylinder supply hose the fluid flow begins. A closed-center system requires a special pump that can stop pumping flow yet maintain pressure. In an open-center system the fluid is always flowing through the valve and back to the reservoir. In an open system when the valve is opened flow is diverted to flowing to the cylinder supply hose instead of to the reservoir. When you place an open center valve in a closed center system you essentially poke a hole in the dam lowering the pressure and flow that the 3 point is expecting to see. The hole in the dam is the open center valve allowing the oil to flow back to the reservoir in the return hose. Hope this make sense.

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Tx Jim

03-18-2023 16:48:40




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 Re: John Deere 1120 3pt hitch won't lift when I hook up loa in reply to James1948, 03-18-2023 15:36:54  
Welcome to this forum

What you state sounds typical for frt end loader control valve not being configured for closed center hyd system such as your model 1120 has. Simple test disconnect FEL control valve return oil hose from tractor. Cap orifice on tractor where hose was disconnected from tractor. Aim open return hose into open hyd filler hole behind seat. With FEL control lever(s) in neutral then start engine. If oil exits open hose FEL control valve is at fault & needs a ""closed center conversion plug with proper seals"" installed.

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