420c, direction reverser and HyGard

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Stan Disbrow
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420c, direction reverser and HyGard

Post by Stan Disbrow » Fri May 01, 2020 4:38 pm

Hi,

Don't. Use. HyGard.

Yeah. I knew that.

But I gots CRS.

I also gots plenty of HyGard here on hand.

I also just changed out the reverser oil in the 420c today. Sounded fine in forward. Really noisy in reverse! Oops! Now I remember! HyGard is too thin. So, drain it back out and put some heavier stuff in. Ah. Much better!

Problem is I won't do this for another 2-3 years and I bet that pesky old CRS will strike again! :P

And, yet I didn't put it in the hydraulic system. I *did* remember to not use HyGard there. :)

I keep other hydraulic oil on hand for the old stuff. Sits right next to the HyGard buckets. And, yet, CRS! Sigh.

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

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

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Lavoy
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Re: 420c, direction reverser and HyGard

Post by Lavoy » Fri May 01, 2020 6:58 pm

Isn't yours a clutch type reverser? If so, Hygard is the modern replacement for 303 fluid. Gear lube won't play well with the clutch discs long term.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

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Stan Disbrow
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Re: 420c, direction reverser and HyGard

Post by Stan Disbrow » Sat May 02, 2020 4:44 am

Hi,

Yes, the differential reverser. My 420c is a Phase III from 1958, so it has the new reverser ala the 430 and 440.

I use a different brand of modern hydraulic oil, not gear lube. HyGard is Deere's modern replacement for 303, but it is thinner than 303 was and the spyder gears are pretty noisy with HyGard. The stuff I use is also not the garbage some places sell as 303. It is heavier than HyGard and that helps. ISO 46, IIRC and HyGard is ISO 36 (also IIRC).

There is an oil supplier in Dunn, NC: Warren Oil, as in the old Amilie refinery in Warren, PA. They have all sorts of good lubricants and only a few miles away. The same kind, essentially, is sold by Tractor Supply as their Traveller brand.

I don't use Deere's HyGard in the hydraulic system of the 420 or the M as the old gear pumps don't like it, either. I use HyGard in everything else, like the JD350C which likes HyGard just fine in everything.

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

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

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Lavoy
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Re: 420c, direction reverser and HyGard

Post by Lavoy » Sat May 02, 2020 8:19 am

I know there are 2 Hygard's now, I think I use the thinner one is my tractor for the hydro. I think it says low vis on it, but don't have a jug around any more to check.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

dtoots1
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Re: 420c, direction reverser and HyGard

Post by dtoots1 » Sat May 02, 2020 9:44 am

got me a bit confused...what do i use in my jd440ic reverser? i have not changed it..if i recall somewhere said ATF, if so what kind? or what iso if hydraulic?

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Re: 420c, direction reverser and HyGard

Post by Lavoy » Sat May 02, 2020 12:33 pm

The ATF was the old Type F, simpler to run Hygard or equivalent, which now is Deere J20C specification I think.
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