John Deere 4630 - How To Make It Start? - The Combine Forum
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post #1 of 49 (permalink) Old 03-03-2018, 05:24 PM Thread Starter
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John Deere 4630 - How To Make It Start?

1977 John Deere 4630 - picked it up about a year ago just shy of 11,000 hours for pretty cheap - had bad tires, oil pump seal was out, broken window, fuel tank leaked, and it had wiring troubles. The guy I bought it from ran it hard and put it away wet but I could tell the guy he bought it from (original owner) took meticulous care of it. So I drug it home, found some tires for it, fixed the oil pump seal (turns out the pump had been replaced at some point - had a serial tag on it), welded up the fuel tank, put a window in it, and just generally dinged it up. Used it all last summer on one of our big balers and it ran without a problem. Used less than a half quart of oil in it's 300 hour oil change and has minimal blow by. Couldn't be happier with it.

That being said, it starts like a bad starting 30 series John Deere. Injection pump and injectors were replaced at about 10,000 hours. So far I have upgraded the starting system and am using the manual destroke valve.

Last night it was 20 F and it has been in the low 40's all day. Went to start it after lunch without being plugged in just to see how it would act. I cranked and cranked and cranked and it would never even hit. Gave it a snort of ether and it fired right up.

What is it about these 30 series? Some are reported to start like a champ but we have had 3 4430's and 2 4630's and they all have to have ether below 50 F.

On our 4430's we finally got smart and put a grid heater off a Dodge pickup on them. Can't do that with the intercooler on the 4630 though.

Short of rebuilding it with higher compression pistons and getting the injection pump and injectors worked over to 4555 specs, is there anything I can do to make it start better?

Here's a picture of the ether hooker:

IMG_20180303_145554.jpg


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From what I've gathered from other new JD equipment and what seems to be a huge concern is "How big is the fridge" and does it keep your wobbly pops cold enough ??
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Thats all Deere has left to make the machine flawless.

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post #2 of 49 (permalink) Old 03-03-2018, 05:32 PM
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You think those start bad the 20 series was real ether hungry!

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post #3 of 49 (permalink) Old 03-03-2018, 10:24 PM
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Our 4630 has started hard forever. We bought it at 5000 hours has 16000 on it now. We just plug it in figure it’s not worth throwing piles of money at it. I might put a gear reduction starter on it to see if it helps. I have put a couple on other tractors with excellent results
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post #4 of 49 (permalink) Old 03-03-2018, 11:19 PM
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40 series started way better. Never heard of a 30 series starting good. Nice looking tractor though.

I'm not here to tip toe through the rose garden, I'm here to bulldoze through the bullshit.
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post #5 of 49 (permalink) Old 03-04-2018, 07:03 AM
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You can get an electric desroker that works with the starter
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post #6 of 49 (permalink) Old 03-04-2018, 07:33 AM
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The whole fuel system is junk, especially the Bosch inline pump. They really make me appreciate a Rosa Master.
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post #7 of 49 (permalink) Old 03-04-2018, 08:19 AM
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A battery sidebox step on left side for 2 batteries. Put in 2 heavy truck batteries and a gear reduction starter.800 or 900 cca. Big batteries and short cables to starter would do you good. Both cables to starter. I do not know if reduction starter is an improvement, but that seems to be the way things are going. Lots of different horsepowers in starters,. 2 12's seem to be better than 2 6's
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post #8 of 49 (permalink) Old 03-04-2018, 08:57 AM
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We made a bigger step and battery box on our 4230. Put two 12 volt batteries together inside of it. Helped quite a bit with starting but still not great.

I'm not here to tip toe through the rose garden, I'm here to bulldoze through the bullshit.
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post #9 of 49 (permalink) Old 03-04-2018, 09:16 AM
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do a compression check,might need valve work.
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post #10 of 49 (permalink) Old 03-04-2018, 09:38 AM
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All ours came with either start from the factory and it wasn't there for nothing!

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