450 Refurb

Show us pictures of your JD crawler and attachments.
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450FiveString
420 crawler
420 crawler
Posts: 44
Joined: Sun Aug 14, 2016 3:23 pm
Location: Tennessee

450 Refurb

Post by 450FiveString » Thu Aug 08, 2019 7:50 am

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I bought this straight 450 dozer a couple of years ago knowing it needed some work but I didn't know what to expect. The previous owner passed away and his son sold it to me. He was my neighbor and I'd seen it when he brought it home but he never ran it more than a few hours. So it had been sitting in his barn for about 10 or 15 years when I got it. I took a battery and put in it after checking the fluids and to my surprise it started right up :D . Then I tried moving it and it moved in every gear but had some steering problems. I got on this forum as soon as I got the dozer and read all I could about it and thought maybe the clutches were stuck so I tried the push the tree method to free them. When I eased against the tree it stopped but didn't lug the engine down as if the clutch was slipping. Finally got time to tear it apart and sure enough the clutch housing had a rat or squirrel nest in it that a 5 gal. bucket wouldn't hold and the throw out bearing was stuck in a position that allowed just enough clutch pressure to move it but not push anything. So that started my journey to refurb this thing and it's been interesting to say the least. I'll post more pictures as I go.

450FiveString
420 crawler
420 crawler
Posts: 44
Joined: Sun Aug 14, 2016 3:23 pm
Location: Tennessee

Re: 450 Refurb

Post by 450FiveString » Thu Aug 08, 2019 7:52 am

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Got the engine out and started looking things over.

450FiveString
420 crawler
420 crawler
Posts: 44
Joined: Sun Aug 14, 2016 3:23 pm
Location: Tennessee

Re: 450 Refurb

Post by 450FiveString » Thu Aug 08, 2019 8:00 am

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The frame rail was cracked on the right side and the two top bolts were broken on the left rail. 4 of the bolts that hold the front crossbar on were broken off , 1 was missing and the threads were stripped out of another. Spent half a day getting broken bolts out. Cut the broken part off the frame rail, made a new one and welded it on.

450FiveString
420 crawler
420 crawler
Posts: 44
Joined: Sun Aug 14, 2016 3:23 pm
Location: Tennessee

Re: 450 Refurb

Post by 450FiveString » Thu Aug 08, 2019 8:07 am

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The clutch housing had 1" bolts in it but I thought it strange that there was this strap welded on the two bolts. Seemed like a bit of overkill to keep them from loosening. After torching off the straps I saw the reason for them. The clutch housing threaded holes were worn out :o . These straps were simply holding the bolts in so they couldn't fall out!

450FiveString
420 crawler
420 crawler
Posts: 44
Joined: Sun Aug 14, 2016 3:23 pm
Location: Tennessee

Re: 450 Refurb

Post by 450FiveString » Thu Aug 08, 2019 8:13 am

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Here's the repair
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I made new stainless steel inserts and welded them in.

B Town
1010 crawler
1010 crawler
Posts: 388
Joined: Fri Dec 11, 2015 7:04 pm
Location: Western Iowa

Re: 450 Refurb

Post by B Town » Thu Aug 08, 2019 8:20 am

Amazing work. Your machine will be an excellent asset when completed. Best regards, Bruce

450FiveString
420 crawler
420 crawler
Posts: 44
Joined: Sun Aug 14, 2016 3:23 pm
Location: Tennessee

Re: 450 Refurb

Post by 450FiveString » Thu Aug 08, 2019 9:33 am

Thank you sir.

hydrogeo
440 crawler
440 crawler
Posts: 177
Joined: Mon Nov 21, 2011 3:48 pm
Location: New Hampshire

Re: 450 Refurb

Post by hydrogeo » Mon Aug 12, 2019 6:44 am

Sweet boring head for your mill. Mine came with a bunch of tooling, but I would love one of those along with a rotary table.

450FiveString
420 crawler
420 crawler
Posts: 44
Joined: Sun Aug 14, 2016 3:23 pm
Location: Tennessee

Re: 450 Refurb

Post by 450FiveString » Tue Aug 13, 2019 10:41 am

Here's some additional repairs

Frame rail beforeImage
Frame rail repaired
Image
Image
Steering levers badly wornImage
Steering levers repaired Image
New pins vs old for steering leversImage

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