420c throwout bearing

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Gettingstuffdone
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420c throwout bearing

Post by Gettingstuffdone » Wed Mar 25, 2020 5:17 pm

Good Day All!

I have a 1958 420c with a left steering clutch issue. The machine is new to me, after bringing it home and about 30min of run time the left steering quit working. I popped the covers and cap to adjust the throwout and/or to see what was going on. Two thing immediately jumped out.
First is that the throwout looks fully adjusted out by looking at the set screw position, but the I have over a 1/4 inch before the throwout contacts the pressure plate fingers which just starts to engage at the end of the throw. Also, the throw out doesn't engage the fingers evenly, but I don't know if that is because of how far it has to go before it makes contact.
Second is that the brake band acts like its tension is backwards. Nothing stops it from pushing up into the adjustment screw.

The fella I got it from said he just did both clutches last summer, and the left pressure plate doesn't look old and grimy with clutch dust or grease.

Am I looking at pulling the finial drive to remedy this, or am I (hopefully) overlooking something.

Best Regards,

Jim

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Lavoy
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Re: 420c throwout bearing

Post by Lavoy » Wed Mar 25, 2020 5:36 pm

Something is screwed up, nothing you will be able to repair from the outside. Two quick guesses are previous owner never set the pressure plate fingers with the gauge, or damage to the throwout tube and associated.
My other guess is that 'Did both clutches" might mean a single part replaced, not completely rebuilt. Either way you are going to have to tear it down, nothing that can be addressed from the outside. Look at ALL of the components in there, as well as linkages, springs, etc. Fix it right, fix it once, I normally have all of the pieces in stock.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

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Gettingstuffdone
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Re: 420c throwout bearing

Post by Gettingstuffdone » Wed Mar 25, 2020 6:32 pm

Alrighty then!
Thank you very much for the swift reply. The wife isn't thrilled with having to dive into it after just getting it, but in that first 30min I ran it I cleared most of her front horse pasture with it, so I told her that its her fault it broke! Ha!
Well, it gives me a reason to pick up the SM sooner than I expected...
Wish me luck,

Regards,

Jim

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Paul Buhler
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Re: 420c throwout bearing

Post by Paul Buhler » Wed Mar 25, 2020 6:54 pm

Hi: I tore into my 420s finals a few years ago, and posted here. Click on the pictures, and I think that you'll be routed to my photobucket account, and the pictures will be clear. Hope you find this thread helpful when you get into your finals. Paul

viewtopic.php?f=1&t=10160&hilit=Noise
Paul Buhler
Killington, VT
420c 5 roll with 62 blade, FOPS, and Gearmatic 8a winch

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Gettingstuffdone
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Re: 420c throwout bearing

Post by Gettingstuffdone » Thu Mar 26, 2020 4:36 pm

Thank you!

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Lavoy
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Re: 420c throwout bearing

Post by Lavoy » Thu Mar 26, 2020 6:17 pm

I normally stock the service manual, if not, short delay to order. I would get a parts manual too, way handier than trying to get the info off the internet when you are standing next to the crawler.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

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