[AT] John Deere Projects UPDATES

[Mark Johnson]

110 lbs for a Deere flywheel seems about right. The weight of the 
flywheel is almost independent of the engine size...730 flywheels aren't 
much over 100 lbs either. Apparently as the engines get bigger, the 
extra mass in the crankshaft provides enough moment of inertia to keep 
things running. Does anyone here remember how much the crankshafts 
weight in various larger two-cylinder engines? I know they aren't 
featherweights, given that the rod journals on a 620/630/60/G are about 
4" in diameter.

My recollection is that one stout feller can take one off, but it took 
two of us to put one on! The only task I can remember that was worse was 
replacing the main reduction gear, which on a 730 is 'interference fit' 
- you have to heat the gear in hot oil to get it to slide onto the 
crankshaft! It's probably the same on the 620/630 but I didn't happen to 
be around when they (Pop & Grandpa) rebuilt that one. I do have a used 
620 connecting rod in my junk iron collection.

Mark J

Columbia MO


On 6/18/2020 8:44 PM, lcmason at uslink.net wrote:
> I had a JD 520 that had a cracked flywheel. It also made a bad noise. It was not hitting anything, just shifting slightly on the shaft, It is similar to the noise that would occur if the flywheel was not tightened enough. It was quite a few years ago, and the flywheel didn't feel too heavy coming off, but the replacement seemed a lot heavier once I saw the shipping weight (110 lbs???)
> Larry Mason
> Hackensack MN
>
> ----- Original Message -----
> From: szabelski at wildblue.net
> To: "Antique Tractor Email Discussion Group" <at at lists.antique-tractor.com>
> Sent: Thursday, June 18, 2020 7:27:36 PM
> Subject: Re: [AT] John Deere Projects UPDATES
>
> My bet is that you’re correct and that there is some displacement and that nut indicates it is where the most displacement occurs. That’s probably why the cracks and why the nut is beat up. Do you know what it was hitting against? I’d take a good look and see what it was hitting to make sure nothing else is damaged.
>
> Probably explains the clutch burning also.
>
>
> Carl
> ----- Original Message -----
> From: STEVE ALLEN <steveallen855 at centurytel.net>
> To: at at lists.antique-tractor.com
> Sent: Thu, 18 Jun 2020 20:08:07 -0400 (EDT)
> Subject: [AT] John Deere Projects UPDATES
>
> Well, gents, I have another update in the long saga.
>
> Let's begin with the '51 A.  I acquired a mesh nozzle to go over the inlet of the sediment bowl so that I could pull the lawnmower tank off the side (I was afraid of catching it on a tree limb while working) until we can pull the tank to clean it right.  It is a tall, fine mesh that keeps the crud out, and, when we used the tractor, it worked very well:  plenty of gas, no clogging the inlet.  Not the permanent solution but a workable one.  Tractor did a great job finishing up the brush-hogging.  I still need to replace the points.
>
> Now, the '49 A.  I thought I had bought a set of points for it, but I was wrong.  I did get a cap, however, and, after cleaning up the old points as well as I could and replacing the gap, we had a good spark.  The old boy cranked up on the third or fourth revolution.  Spiffy!
>
> We pulled it out to run it some, and it seemed that there was a hammering in the engine.  There has always been a sensation of that, but it seemed obviously more apparent to me.  We did just a little work, but it seemed to be getting worse.  Also, the clutch was smoking when  it was disengaged.  No slipping, no noise, and it snapped in and out just fine, but, when disengaged, it smoked.  So we parked it.  Today, I had my son pull the flywheel cover off today, and we discovered the hammering problem (at least I'll bet):  Two cracks.  If the pic comes through, you should be able to see them near the lower, right nut.  there is obvious displacement of the casting, so I'll bet that puppy is loose on there.
>
> So now we need to change the flywheel.  Fortunately, I have one.  We just need to figure out how to handle it (and also to set it in place correctly).
>
> Briefly on the '47 B:  We need to test the starter and reinstall.  The generator is probably no good, so we'll just disconnect it.  I want to put good batt cables on it.  We'll probably work on it as we prepare to replace the flywheel on the '49.
>
> It's always somethin', ain't it?
>
> The "original" Steve Allen
>
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