hydraulic questions

General help and support for your Lindeman through 2010 John Deere crawler
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1954cooter
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hydraulic questions

Post by 1954cooter » Sat Nov 26, 2016 10:30 am

I want to remove stock JD hydraulic pump and replace with a front mounted pump.Can I just remove old pump and cover with a plate? And where can I get a splined yoke to fit the crank shaft?This is on my 420.

Thanks, Cooter

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Lavoy
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Post by Lavoy » Sat Nov 26, 2016 10:32 am

I have the cover for the cam pump, and might have a splined coupling for the front of the crank gear, but not sure.
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Parts and restoration for antique and late model John Deere crawlers.
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1954cooter
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cover

Post by 1954cooter » Sat Nov 26, 2016 10:49 am

Thanks Lavoy,Is it a special cover or can I make one out of flat plate?My main objective is to increase the psi in my hydraulic system.Do you know a good size pump to use on the front?Not sure what the flow/psi is for stock pump.

Thanks, Cooter

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notmeu
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Re: cover

Post by notmeu » Sat Nov 26, 2016 3:40 pm

May I ask 1954cooter why you want to increase the psi on your crawler? The factory psi is 900-950 with a maximum of 9 gallons per minute, depending on your throttle position, if my memory serves me correctly. Which is pleanty for these old girls!
Last edited by notmeu on Sun Nov 27, 2016 6:54 pm, edited 1 time in total.
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.

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1954cooter
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Post by 1954cooter » Sun Nov 27, 2016 9:28 am

Mostly want to make hydraulic system work better.The 59 year old parts are getting tired.

Cooter

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Post by Lavoy » Sun Nov 27, 2016 6:02 pm

If you throw the pump, you throw the whole system, you can not just increase pressure and reuse any of the old components.
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Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

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1954cooter
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Post by 1954cooter » Mon Nov 28, 2016 2:25 pm

Plan was to replace everything in the hydraulic system.

Cooter

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Post by Lavoy » Mon Nov 28, 2016 2:46 pm

Do you have a non factory attachment or something that is requiring more hyd flow or pressure?
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

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1954cooter
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Post by 1954cooter » Mon Nov 28, 2016 4:43 pm

Putting new cylinders on for lifting blade and want to make blade power angle.Blade is made by "angle dozer company" not a stock JD set-up.Stock pump works good,stock valve is leaky and slow to respond.

Cooter

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notmeu
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Post by notmeu » Mon Nov 28, 2016 6:22 pm

Cooter, there is no need to install a higher psi pump on your 420 to operate the blade. The factory pressure your pump puts out provides enough pressure for the weight of a 420. I have a six way blade installed on my 420, and there has been many times when pushing a heavy pile of dirt and angling the blade left or right while moving, it would push my 420 left and right while never having any lack of power in the hydraulics. So having more pressure would not be needed. If your having problems with you valve just replace it with a new 3 spool valve, just be careful most valves relief range is from 1500-3000 psi. You will probably have to install a lower psi relief value before the valve like I did. Just make sure you do not set the relief above 1000 psi or you will damage the factory pump. Here is a link to another post showing which valve I used and the separate relief valve.

http://www.jdcrawlers.com/messageboard/ ... highlight=
Last edited by notmeu on Tue Nov 29, 2016 7:00 am, edited 1 time in total.
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.

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1954cooter
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Post by 1954cooter » Mon Nov 28, 2016 8:30 pm

Notmeu..is your 420 blade set-up an outside rail or inside ?

Cooter

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notmeu
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Post by notmeu » Mon Nov 28, 2016 8:41 pm

Cooter. It is a inside the rail setup. Greenville Railcar Bull Blade was the manufacture.

http://www.jdcrawlers.com/messageboard/ ... highlight=
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.

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1954cooter
430 crawler
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Posts: 52
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Location: New Brunswick, Canada

Post by 1954cooter » Tue Nov 29, 2016 7:38 pm

Notmeu...looks nice,too good to put to work.

Cooter

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notmeu
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Post by notmeu » Wed Nov 30, 2016 7:08 am

Those photos are older, the crawler looks different now. I have been using it for winching tree length logs for firewood and building trails the past few years. Nothing I have will ever be a trailer queen!!!
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.

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