420 running problem

General help and support for your Lindeman through 2010 John Deere crawler
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dr1zsk1
430 crawler
430 crawler
Posts: 73
Joined: Sun May 22, 2011 7:11 am
Location: Clyde America (Texas)

A problem I found on my 420c - similar

Post by dr1zsk1 » Tue Mar 11, 2014 9:38 am

My 420 would work like the dickens -- hot and cold. Then it would apparently randomly cut of -- it sounded as if either it was out of fuel.

Really odd because it would almost cut off and then it would fire and run ragged for a bit. Then it would run well for a long time.

Couldn't track it down. Then an aha moment hit so while it was doing its trick I just moved the switch to setting #2 and all of a sudden it was running fine and no more symptoms.
If man can break it man can fix it .. it just takes time and money.

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Stan Disbrow
350 crawler
350 crawler
Posts: 2894
Joined: Fri Jul 15, 2005 3:13 pm
Location: Raleigh, NC

Post by Stan Disbrow » Tue Mar 11, 2014 11:27 am

Hi,

Yes. My 420c 'I' position (#1) is worn to the point it is intermittent. I installed a new toggle switch in the plate that covers the hole where the hour meter used to be. I ran new wires as well. Now the ILBD switch stays off unless I need lights.

Too many miles on the contacts in that first position. ;)

Stan
There's No Such Thing As A Cheap Crawler!

Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

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Lu47Dan
1010 crawler
1010 crawler
Posts: 401
Joined: Mon Feb 11, 2008 3:17 pm
Location: NWPa

Re: 420 run problem

Post by Lu47Dan » Wed Mar 12, 2014 2:26 pm

theshanmand1! wrote:hello men,

I removed the alternator this morn, took it in to napa and they tested it, it is toast! they also said it is not a single wire internal regulator alt. :( I almost don't want to hear what I have burned up running it this way without a regulator :oops: more learning the hard way! I am going to order a new one from Steiner, new plugs, a heavier duty key switch &
wire it again. also I will re-check my ballast resistor for ohms and my coil
for the correct range of ohms.

hmm.... what else? oh yes, load test my battery to see if its toast also.

how bout it boy's, think she might run? :wink: hope so...

thanks again for all of your helpful input, I am learning however so slowly.
:idea:
Don't order an alternator, by a rebuild kit for a 10SI from JEGS #555-10140 for $39.99 instead. It is not hard to rebuild one of them.
I have rebuild several dozen of them for various people around here.
I also built a new mount for the one on my '56 420.
Dan.
1956 420C with GSC blade
Tools are to men as shoes are to women , you can never have too many !!
Used diesel engines are an adventure any way you look at them !!

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jtrichard
350 crawler
350 crawler
Posts: 1883
Joined: Sun Jan 11, 2009 9:48 pm
Location: Joshua Tree CA

Re: 420 run problem

Post by jtrichard » Wed Mar 12, 2014 4:17 pm

theshanmand1! wrote:hello men,

I removed the alternator this morn, took it in to napa and they tested it, it is toast! they also said it is not a single wire internal regulator alt. :( I almost don't want to hear what I have burned up running it this way without a regulator :oops: more learning the hard way! I am going to order a new one from Steiner, new plugs, a heavier duty key switch &
wire it again. also I will re-check my ballast resistor for ohms and my coil
for the correct range of ohms.

hmm.... what else? oh yes, load test my battery to see if its toast also.

how bout it boy's, think she might run? :wink: hope so...

thanks again for all of your helpful input, I am learning however so slowly.
:idea:
not all internal reg. alts. are one wire..... look at the pic in this post http://www.jdcrawlers.com/messageboard/ ... highlight= if the terminals 1 and 2 are flat/inline then it is a internal reg like the pic BUT unless some one has changed the reg. to a one wire setup is has to have 3 wires sounds like you have a bad diode which can drain the batt down to zero
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

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