420c

General help and support for your Lindeman through 2010 John Deere crawler
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Badbones
40C crawler
40C crawler
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420c

Post by Badbones » Sun Sep 21, 2014 5:05 pm

Hi, I have 1958 john deere 420c and I'm having a problem that I can not figure out. It starts good, moves but when I'm pushing dirt it has no power, even on 1st gear. I check all fuel lines, tank and filters so gas is not a problem
Anybody out there with ideas
Thx
Pat

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jtrichard
350 crawler
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Location: Joshua Tree CA

Post by jtrichard » Sun Sep 21, 2014 7:44 pm

main jet in carb plugged most likely
2010 with 622 dozer with mod. 35 ripper and a 2010 with 622 dozer bought in 1969 and a 2010 loader with drott and mod. 36 ripper

cantbeatadeere
440 crawler
440 crawler
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Location: new york..upstate..

Post by cantbeatadeere » Mon Sep 22, 2014 4:54 am

A engine with the timing off a bit will start and run fine yet have very low power output...need more detailed info to help, does it backfire at all, smoke, skip, is the unloaded throttle response good or bad?

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wizner85
430 crawler
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Location: Danville PA

Post by wizner85 » Mon Sep 22, 2014 8:38 am

Definitely main jet issue. Had that happen. Ran good, then died when doing work. Took carb apart and bingo, giant piece of gunk in the main jet.
It's a fuel issue.
440 ICD 64 blade & 8a gear attic winch
440 ICD 831 loader with scarifier and weights
420 62 blade 3pt
Looking for 24 scarifier and 440 log arch

Badbones
40C crawler
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Post by Badbones » Mon Sep 22, 2014 10:01 am

Thx, I will clean the the on the weekend then go from there

Badbones
40C crawler
40C crawler
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Joined: Sat Sep 20, 2014 5:05 pm

420c

Post by Badbones » Thu Oct 09, 2014 3:50 pm

Tried cleaning the main jet but everything was strip so I ordered a rebuilt carb from McDonald carb & ignition model tsx530. Just install it but did not fix my problem, still no power when pushing dirt. Starts well, good respond with the throttle but just no power. Anybody got suggestions

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Tigerhaze
350 crawler
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Post by Tigerhaze » Thu Oct 09, 2014 5:06 pm

First of all, those carbs have to be properly adjusted to have power under load- there is a separate "load" (power) adjustment screw. Did you adjust all (on my 8N's M-S carb there is three) air screws on the carb in the required sequence?

If that is OK, did you check the timing as someone had already suggested? I would pay special attention the distributor mechanical advance as they can rust up.

If those all check out have you checked engine compression? Also are you sure engine clutch isn't slipping when under load?
(1) JD Straight 450 crawler dozer with manual outside blade; (2) JD 2010 diesel crawler loaders; (1) JD 2010 diesel dozer with hydraulic 6-way blade; (2) Model 50 backhoe attachments, misc. other construction equipment

Badbones
40C crawler
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Post by Badbones » Thu Oct 09, 2014 5:43 pm

I just saw 2 adjustment screws. I will check again tomorrow
I check compression on both cylinder, one was at 140 and the other one at 135 psi.

Badbones
40C crawler
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Post by Badbones » Thu Oct 09, 2014 5:46 pm

I check and clean distributor
I don't think is the clutch because as soon as I push dirt the engine wants to stall

Badbones
40C crawler
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Post by Badbones » Thu Oct 09, 2014 5:50 pm

Does anybody have a diagram or specs on how to adjust tsx530

Badbones
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Post by Badbones » Thu Oct 09, 2014 9:34 pm

Yes I have 3 adjustment
Idle speed, idle mixture and the main or load mixture
I will try again tomorrow to adjust, when I install the rebuilt carb today I did not adjust the idle speed screw at all. That's why I was having problems
Thx

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Tigerhaze
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Post by Tigerhaze » Thu Oct 09, 2014 9:49 pm

if I remember right, the adjustment procedure is the idle speed screw first, then idle mixture screw, and then the power load screw. You have to do them in that order or you won't get good results and the governor will "hunt" and you will lose power. The idle speed needs to be checked with the tach to a specific RPM for your engine. The book adjustments for the other screws will get you close but you really need to fine tune to get it right for your machine.

Also the power screw is supposed to be adjusted under load (like pulling a plow or drawn implement), not just under full throttle which also makes a big difference in power, at least on my 8N wheel tractor.
(1) JD Straight 450 crawler dozer with manual outside blade; (2) JD 2010 diesel crawler loaders; (1) JD 2010 diesel dozer with hydraulic 6-way blade; (2) Model 50 backhoe attachments, misc. other construction equipment

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Paul Buhler
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Post by Paul Buhler » Fri Oct 10, 2014 11:25 am

Hi: this might help with the carburetor. Good luck
http://www.antiquefarming.com/PDF/carburetor.pdf
Paul Buhler
Killington, VT
420c 5 roll with 62 blade, FOPS, and Gearmatic 8a winch

Badbones
40C crawler
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Post by Badbones » Sun Oct 12, 2014 5:48 pm

Thanks everyone, the problem was the timing
I quess the two bolt got loose and the distributor moved
Just got some minor adjustement to do on the carb and
we are back in business
Thanks again
Pat

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