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John Deere Tractors Discussion Forum
Show Parts for Model:

4020 hydraulic controls

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Author  [Modern View]

02-16-2014 09:59:35

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I've got a '67 model 4020 with twin sets of hydraulic connections on the back end. I want to add a single lever, 4way valve control for my loader & use the factory control levers to operate my 3pt. grader blade.

As I understand it I will have to install a "hydraulic multiplier" along with some sort of selector valve.

Anyone have experience with this? Also, where is the best location to mount the multiplier?

Any suggestions on this are greatly appreciated. Thanks,


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Nate JD

02-17-2014 16:39:01

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 Re: 4020 hydraulic controls in reply to pilot199, 02-16-2014 09:59:35  
Why not use a pump on mid pto with its own pump

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02-17-2014 18:46:31

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 Re: 4020 hydraulic controls in reply to Nate JD, 02-17-2014 16:39:01  
Quoting Removed, click Modern View to see
#1 Because that would also tie up the rear pto.
#2 Mother Deere unlike other tractor manufactures installed a high pressure/high volume hydraulic system onto most of her tractors. Most aftermarket pto pumps are smaller than the 4020's front pump.
The difficult part is educating people the proper way to connect into the JD hydraulic system. The rear SCV's are for lifting field cultivating equipment. Not for high demand loads.

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Tx Jim

02-17-2014 03:00:49

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 Re: 4020 hydraulic controls in reply to CLW, 02-16-2014 09:59:35  
PN's in photos are JD specific.

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02-17-2014 10:24:03

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 Re: 4020 hydraulic controls in reply to Tx Jim, 02-17-2014 03:00:49  
Thanks again boys, now I know what parts to get.

While we're on the subject, my hydraulic connections on the back of the tractor are original J.D. specific fittings.

On converting this to whatever the modern standard is now, is it better to get adapters or just change the couplers out all together?

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long green line man

02-16-2014 10:13:20

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 Re: 4020 hydraulic controls in reply to pilot199, 02-16-2014 09:59:35  

Attach pressure line to your 4 way valve, with tee at rockshaft pressure line ; return oil a rockshaft return line left side of tran. study pics

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02-16-2014 22:52:27

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 Re: 4020 hydraulic controls in reply to long green line man, 02-16-2014 10:13:20  
Thanks to all for the advice & photos.

Glad to hear that I won't need to buy a multiplier.

Are the part numbers I see highlighted in the photos John Deere specific numbers?


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02-16-2014 10:08:48

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 Re: 4020 hydraulic controls in reply to pilot199, 02-16-2014 09:59:35  
Multiplier is likely to tie up one of your selective control valves (SCV). Cheaper option is to add your desired valve for the loader, and draw power directly from the tractor system.

There is an elbow fitting just forward of the brake pedals. It feeds the tractor"s rockshaft. Replace that elbow with a Tee, to feed the rockshaft and your extra valve. Return line from your new valve goes to the transmission filter cover. You can buy a ported cover or tap into your existing cover. Check archives for details and pix.

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David G

02-16-2014 10:06:53

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 Re: 4020 hydraulic controls in reply to pilot199, 02-16-2014 09:59:35  
You will not need a multiplier.

Much has been posted on these conversions, so search the archives.

Your loader control valve needs to be closed center.

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