Search found 17 matches

by 420C-Mike
Wed Sep 12, 2018 4:50 am
Forum: Early model JD crawler technical support
Topic: Early and Late 440 Final Drive Housing Interchangeability
Replies: 16
Views: 2406

Re: Early and Late 440 Final Drive Housing Interchangeability

I found out the hard way that the later model 440's use a different oil pan cover on the final drive as well. 40/420/430 and early 440's use a common cover. The later 440's with the different final drive housing is slightly larger and bolt holes do not line up
by 420C-Mike
Tue Jun 12, 2018 2:40 pm
Forum: Early model JD crawler technical support
Topic: Track tension bolts
Replies: 6
Views: 582

Re: Track tension bolts

Has anyone used a threaded 1" rod to replace the spring tension bolts? I can get 3 foot threaded rod with a yield strength of 105,000 psi (slightly better than grade 5)

Lavoy- I will give you a call regarding the seals and update on repinning the tracks

Mike
by 420C-Mike
Mon Jun 11, 2018 6:55 am
Forum: Early model JD crawler technical support
Topic: Track tension bolts
Replies: 6
Views: 582

Re: Track tension bolts

Thanks Lavoy I assumed the correct bolts are no longer available. Unfortunately, some threads have been completely worn off on one side for over an inch in length and bent bolts make turning the nuts extremely difficult even where threads exist. Fortunately I have 6 spring assemblies from which to m...
by 420C-Mike
Sun Jun 10, 2018 4:49 pm
Forum: Early model JD crawler technical support
Topic: Track tension bolts
Replies: 6
Views: 582

Track tension bolts

I am rebuilding my track system. The tension bolts (1"x25') have some bad threads. Any suggestions? should I buy new bolts and remount the springs? Fastenal has some grade 8 long bolts or are the other sources?

Mike
by 420C-Mike
Sat May 05, 2018 8:33 pm
Forum: Early model JD crawler technical support
Topic: 420 dozer for sale 5hours down the road
Replies: 4
Views: 525

Re: 420 dozer for sale 5hours down the road

I believe the first year (1956) 420 did not have the yellow stripe. It as added in 1957.

Mike
by 420C-Mike
Mon Nov 13, 2017 3:57 pm
Forum: Early model JD crawler technical support
Topic: 420C Carburetor
Replies: 7
Views: 1057

Re: 420C Carburetor

probably will eventually get a 420 carb (lots of other items to repair first).. TSX245 used on 40C as well as M so it is closer to my early 420 which seems to be a modified 40C :D
by 420C-Mike
Sun Nov 12, 2017 8:02 am
Forum: Early model JD crawler technical support
Topic: 420C Carburetor
Replies: 7
Views: 1057

Re: 420C Carburetor

Thanks Stan
It is amazing the versatility of these machines and the 'substitutions" I find in my "project to rebuilt this 420C machine. Let's see: MC Carburetor, 40C crawler links- will see what I find next!
by 420C-Mike
Fri Nov 10, 2017 7:26 pm
Forum: Early model JD crawler technical support
Topic: 420C Carburetor
Replies: 7
Views: 1057

420C Carburetor

I have a 1956 420 crawler. The parts info I found indicates it should have Marvel Schreiber carburetor model TSX641. The unit installed on my crawler is a TSX245 which I believe was used on the earlier MC machines. Is there a a difference? Does the TSX245 cause performance or other issues when used ...
by 420C-Mike
Mon Sep 18, 2017 3:10 pm
Forum: Early model JD crawler technical support
Topic: idler Disassembly issues
Replies: 2
Views: 715

Re: idler Disassembly issues

Thanks- actually had already tried that. This project gave me an excuse to buy a 20 ton press. Took most of the available force but eventually it "popped" and I was able to push it out Lots of corrosion leading to siezure. On to thenext part of the project!!
by 420C-Mike
Sun Sep 10, 2017 10:24 am
Forum: Early model JD crawler technical support
Topic: idler Disassembly issues
Replies: 2
Views: 715

idler Disassembly issues

Disassembling take-up idlers as I plan to replace standard ones with oversized units. First one came apart as expected. Second one the shaft seems to be seized in the bushings.I tried a large gear puller to push out the shaft but it will not move. Suggestions? Do I need to put in in a press?

Mike
by 420C-Mike
Mon Sep 04, 2017 9:43 am
Forum: Early model JD crawler technical support
Topic: tracks
Replies: 2
Views: 856

Re: tracks

Danny I can attest the 40C belt will fit your 420C but as noted by lavoy they are "different". Unbeknownst to me, My 'Project" 420C had 40C crawler belts when I purchased it. The belt was worn and out of pitch. A former owner also had apparently removed a link in each belt to accomadate the wear. Wh...
by 420C-Mike
Fri Oct 07, 2016 1:40 pm
Forum: Early model JD crawler technical support
Topic: JOHN DEERE 420C Track Groups Complete w 14" Single Bar
Replies: 6
Views: 1669

Not sure the brand but I had an opportunity to talk to Berko factory engineers last week at the mining show in las vegas. They confirmed that Berko does NOT have a product that fits the 420C (for what it is worth). I am "collecting" used 420c rails. Close to getting enough to take to Lavoy for a ful...
by 420C-Mike
Mon Sep 12, 2016 1:45 pm
Forum: Early model JD crawler technical support
Topic: Oversized Idler on 420C
Replies: 6
Views: 1908

Oversized Idler on 420C

I was recently at a salvage yard and found a 420C Idler and tension spring assembly that I couldn't pass up only to realize when I got it home that it was the Oversized Idler. What was the purpose of the oversized idler? Intuition says it was for worn pins and bushings but the parts book shows it wi...
by 420C-Mike
Tue Sep 06, 2016 6:34 pm
Forum: Show & Tell
Topic: Bucyrus 495HR2 and Cat 797F
Replies: 2
Views: 5248

Nice Pics- bigger than my "new 420c"

Good to see- I spent my career on these machines (about to retire after 40 years) I had design responsibility for much of the 495 series shovels particularly the electrics.

Now I have a lowly 420c ( great machine) which is younger than me an weighs about the same as one crawler pad on the 495!!
by 420C-Mike
Mon Mar 14, 2016 6:22 pm
Forum: Early model JD crawler technical support
Topic: 40C tracks on a 420C??
Replies: 1
Views: 1112

40C tracks on a 420C??

Continuing to learn about the "toy" as I start to embrace the many 420 crawler rebuild projects. Knowing I had considerable wear with apparently a link already removed (30 links each side on a 420C 4 roller), I have resigned myself to make a sizeable investment and have Lavoy rebush/pin my crawler b...