4020 hydraulic controls

Pilot199 · Feb 16, 2014

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,

Gary

David G · Feb 16, 2014

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.

JMS/.MN · Feb 16, 2014

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.

long green line man · Feb 16, 2014

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

Pilot199 · Feb 17, 2014

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?

Gary

Tx Jim · Feb 17, 2014

PN's in photos are JD specific.

Pilot199 · Feb 17, 2014

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?

Nate JD · Feb 17, 2014

Why not use a pump on mid pto with its own pump

buickanddeere · Feb 17, 2014

(quoted from post at 20:39:01 02/17/14) Why not use a pump on mid pto with its own pump

#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.

4020 hydraulic controls

Pilot199

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David G

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JMS/.MN

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long green line man

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Pilot199

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Tx Jim

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Pilot199

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Nate JD

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buickanddeere

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