hydraulics

General help and support for your Lindeman through 2010 John Deere crawler
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shugy368
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hydraulics

Post by shugy368 » Thu Dec 28, 2017 12:36 pm

Hi everybody and happy holidays! I have a new project , am installing a Thumb to my 420-C loader and am looking for advice as to hose assemblies and if the 420 HYD pump will handle such an addition. Any help is much appreciated, IMO, this is the place for just that 8)

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Lavoy
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Re: hydraulics

Post by Lavoy » Sun Dec 31, 2017 12:20 am

Not a pump issue, thumb should take less flow than main lift cylinders, should work fine.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
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shugy368
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Re: hydraulics

Post by shugy368 » Mon Jan 01, 2018 10:46 am

Thank you Lavoy :D

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notmeu
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Re: hydraulics

Post by notmeu » Wed Jan 03, 2018 6:28 pm

I installed a thumb on my Terramite T7 loader bucket. I installed hydraulic quick disconnect couplings to reduce the flow down to 3-4 gallons per minute which works out perfect. I also installed a electrical diverted valve plumbed into the loader curl cylinder, that way I did not have to purchase a additional valve. I just momentarily energized the diverted valve with a push button and the hydraulic flow goes to the thumb instead of the curl. My hydraulic pressure is around 2500 psi. I purchased all of the hydraulic components from surpluscenter.com
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.

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shugy368
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Re: hydraulics

Post by shugy368 » Sun Jan 07, 2018 11:29 am

That sounds awesome notmeu, would you have any pics/schematics or detailed instrucs that I could look at or download? also will the diverter switch work on a 6 volt sys.?

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notmeu
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Re: hydraulics

Post by notmeu » Sun Jan 07, 2018 5:35 pm

This is not the exact one that I used but very similar

https://www.surpluscenter.com/Featured- ... 9-8602.axd

There is a tap that shows how it is plumbed into the hydraulics. Being that you have 6volts is a problem. I’m sure there is someone out there that sells the same thing in 6vdc but you will have to do some searching!
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.

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shugy368
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Re: hydraulics

Post by shugy368 » Tue Jan 09, 2018 9:39 pm

Thanks right now I have a starting problem, shut her off two days ago now no spark at coil? any ideas?

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Stan Disbrow
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Re: hydraulics

Post by Stan Disbrow » Wed Jan 10, 2018 5:31 am

Hi,

Points. Power goes from battery to switch to coil to points to ground. Easy enough to follow even if using just a lightbulb to test. I lose spark, first thing I do is get out the points file and clean the contacts.

Stan
There's No Such Thing As A Cheap Crawler!

Have: '58 JD 420c 5-roller w/62 inside manual blade
Have: '78 JD350C w/6310 outside manual blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Also Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

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notmeu
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Re: hydraulics

Post by notmeu » Thu Jan 11, 2018 4:54 pm

Do you have a ballast resistor on the coil? They are usually 3 ohms if my memory is accurate
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.

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