Is it possible that the venture is installation direction sensitive? Upside down????mnfordtech wrote: ↑Wed Oct 24, 2018 11:31 amWhen my carb is all together the venture will not move, so I assume that it is sealing. I sent you a P.M.
carb problem
- gregjo1948
- 350 crawler
- Posts: 1000
- Joined: Mon Aug 30, 2010 5:58 am
- Location: Newark Valley,NY,USA
Re: carb problem
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford
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- 420 crawler
- Posts: 26
- Joined: Sun Oct 21, 2018 9:57 am
- Location: Northern Minnesota
Re: carb problem
Venturi can only go in one way - one end is larger than the other.
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- 420 crawler
- Posts: 26
- Joined: Sun Oct 21, 2018 9:57 am
- Location: Northern Minnesota
Re: carb problem
Lavoy, I sent you another P.M. I would like to purchase a kit for this carb to see if that will fix it.
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- 420 crawler
- Posts: 38
- Joined: Sat Sep 23, 2006 12:20 pm
- Location: Columbus, Ohio
Re: carb problem
Lavoy is correct, originally the venturi fits tightly. I believe over time the venturi relaxes and loses the tight fit, that is why I used the sealer and it cured my problem. I believe the venturi is aluminum or pot metal while the carburetor body is cast iron.
1960 440 ICD with 602 blade
1960 440 ICD with 831 bucket
1960 440 ICD with 831 bucket, center throttle
1960 440 ICD with 831 bucket
1960 440 ICD with 831 bucket, center throttle
Re: carb problem
They should be brass, but have seen some plastic or synthetic ones on occasion.
I have been replying to your PM's, must not be getting them. Shoot me an e-mail at postmaster@jdcrawlers.com instead.
Lavoy
I have been replying to your PM's, must not be getting them. Shoot me an e-mail at postmaster@jdcrawlers.com instead.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com
Owner and moderator www.jdcrawlers.com
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- 420 crawler
- Posts: 26
- Joined: Sun Oct 21, 2018 9:57 am
- Location: Northern Minnesota
Re: carb problem
Update - rebuilt the carb installing all new parts from a carb kit but still have the same problem. If I ever figure this thing out I'll let everyone know. Leaning towards replacing the carb if I can find one. Wish me luck!
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- 420 crawler
- Posts: 26
- Joined: Sun Oct 21, 2018 9:57 am
- Location: Northern Minnesota
Re: carb problem
UPDATE - replaced the carb with a rebuilt and my dozer runs like a charm! Tried it out by pushing out a pine stump from a tree that had blown over from a storm this summer and it didn't hesitate one bit. I had even sprayed some paint on the machine to make it look pretty.
Re: carb problem
Is the original carb for sale??
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- 420 crawler
- Posts: 26
- Joined: Sun Oct 21, 2018 9:57 am
- Location: Northern Minnesota
Re: carb problem
Had to send it back for a core charge.
- Paul Buhler
- 350 crawler
- Posts: 991
- Joined: Wed May 21, 2008 6:25 pm
- Location: Killington, VT
Re: carb problem
I realize that I'm late to the party, but maybe this will be helpful in the future.
http://www.oldcarmanualproject.com/manu ... TX-TSX.pdf
Paul
http://www.oldcarmanualproject.com/manu ... TX-TSX.pdf
Paul
Paul Buhler
Killington, VT
420c 5 roll with 62 blade, FOPS, and Gearmatic 8a winch
Killington, VT
420c 5 roll with 62 blade, FOPS, and Gearmatic 8a winch
Re: carb problem
Good link Paul!! Thanks
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.
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- 420 crawler
- Posts: 26
- Joined: Sun Oct 21, 2018 9:57 am
- Location: Northern Minnesota
Re: carb problem
Thanks for the link but I had already printed this thinking it would help me with my problem but replacing the carb was the only solution,
Re: carb problem
I had that problem with a 420 C, even had the carburetor rebuilt and problem persisted. I finally took carburetor apart and took an air chuck with a rubber tip so I would get somewhat of a seal and blew through all holes, especially all of the small ones. Some are barely larger than a pin. Problem solved, the tractor idles smooth without using choke.
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- 420 crawler
- Posts: 26
- Joined: Sun Oct 21, 2018 9:57 am
- Location: Northern Minnesota
Re: carb problem
Believe me, I tried this same thing several times with my carb but could not find/fix the problem with it. Whatever was wrong with it will remain a mystery.
Re: carb problem
I'm guessing you didn't find all the holes in the load jet Lavoy mentioned. They can get so completely filled in that they no longer exist, and you have to shine it up to see where there are dark spots instead of brass.
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