40c Safety blocks

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fundytides
440 crawler
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40c Safety blocks

Post by fundytides » Mon Jun 26, 2017 12:40 pm

I have a 40c 4 roller that I am doing some work on (Does it ever end?). When I bought the crawler a several years ago it was missing, among other things, the safety blocks. I picked up a set last year but when trying to install them, I find that there is not enough room between the sprocket and the crossbar to fit the blocks. I checked to make sure that I don't have oversize sprockets. What other things could cause this problem?
have 40c 4 roller crawler, 1927 Ford T Touring car, 1931 Ford A Roadster, 1951 Standard Vanguard Saloon. Never a dull moment!

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Lavoy
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Re: 40c Safety blocks

Post by Lavoy » Mon Jun 26, 2017 2:57 pm

Usually it is the sideframe to clutch housing holes are oblonged due to someone replacing the acorn nuts with standard nuts and the holes get hammered out.
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fundytides
440 crawler
440 crawler
Posts: 223
Joined: Sun Oct 27, 2013 8:41 am
Location: Saint John, NB, Canada

Re: 40c Safety blocks

Post by fundytides » Mon Jun 26, 2017 7:49 pm

Thanks Lavoy. I'll check it out.
have 40c 4 roller crawler, 1927 Ford T Touring car, 1931 Ford A Roadster, 1951 Standard Vanguard Saloon. Never a dull moment!

fundytides
440 crawler
440 crawler
Posts: 223
Joined: Sun Oct 27, 2013 8:41 am
Location: Saint John, NB, Canada

Re: 40c Safety blocks

Post by fundytides » Thu Jul 06, 2017 12:26 pm

Have the track off to replace it and am checking for the source of the safety block clearance problem while I am at it. I noticed that the number on the sprockets is M3088T which doesn't agree with the number in my parts book. Is this the wrong sprocket?
have 40c 4 roller crawler, 1927 Ford T Touring car, 1931 Ford A Roadster, 1951 Standard Vanguard Saloon. Never a dull moment!

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Lavoy
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Re: 40c Safety blocks

Post by Lavoy » Thu Jul 06, 2017 2:06 pm

Those are later sprockets, 420, 430, 440. You should have TE225 or 235YT sprockets.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

fundytides
440 crawler
440 crawler
Posts: 223
Joined: Sun Oct 27, 2013 8:41 am
Location: Saint John, NB, Canada

Re: 40c Safety blocks

Post by fundytides » Thu Jul 06, 2017 4:54 pm

Thanks Lavoy. This machine is definitely a mix of parts and backyard fixes. Are these sprockets larger diameter than the ones that should be on it? I think when I tackle the other side I will find even more surprises. Just from looking at it, the rollers on the other side are much smaller diameter than the proper ones on the side I'm now working on.
have 40c 4 roller crawler, 1927 Ford T Touring car, 1931 Ford A Roadster, 1951 Standard Vanguard Saloon. Never a dull moment!

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Lavoy
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Re: 40c Safety blocks

Post by Lavoy » Fri Jul 07, 2017 8:35 am

Not sure, they are different bushing size, and heavier. Might be slight difference in OD, although lots of times OD difference between sprockets is wear due to final drive bearings going out and grinding the sprocket on the track stop.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
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fundytides
440 crawler
440 crawler
Posts: 223
Joined: Sun Oct 27, 2013 8:41 am
Location: Saint John, NB, Canada

Re: 40c Safety blocks

Post by fundytides » Fri Jul 07, 2017 8:45 am

What bushings?
have 40c 4 roller crawler, 1927 Ford T Touring car, 1931 Ford A Roadster, 1951 Standard Vanguard Saloon. Never a dull moment!

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Lavoy
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Re: 40c Safety blocks

Post by Lavoy » Fri Jul 07, 2017 8:51 am

Track bushings, sorry.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

fundytides
440 crawler
440 crawler
Posts: 223
Joined: Sun Oct 27, 2013 8:41 am
Location: Saint John, NB, Canada

Re: 40c Safety blocks

Post by fundytides » Fri Jul 07, 2017 10:23 am

Thanks Lavoy. Guess I'll just continue to run these sprockets without safety blocks until I can get a chance to compare with someone who has the correct sprockets.
have 40c 4 roller crawler, 1927 Ford T Touring car, 1931 Ford A Roadster, 1951 Standard Vanguard Saloon. Never a dull moment!

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Lavoy
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Re: 40c Safety blocks

Post by Lavoy » Fri Jul 07, 2017 2:30 pm

I don't think the sprockets are the issue, I have seen it done before, although I can't specifically say I remember if they had track stops or not. I'm still guessing that your final drives have moved ahead because of clutch housing mounting bolt issues. It can also extend all the way to the big bushings in the bellhousing. It isn't good to run the crawler if what I am guessing is occurring, it will just keep wearing and beating on stuff.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

fundytides
440 crawler
440 crawler
Posts: 223
Joined: Sun Oct 27, 2013 8:41 am
Location: Saint John, NB, Canada

Re: 40c Safety blocks

Post by fundytides » Fri Jul 07, 2017 4:47 pm

Thanks. I'll keep checking those things out.
have 40c 4 roller crawler, 1927 Ford T Touring car, 1931 Ford A Roadster, 1951 Standard Vanguard Saloon. Never a dull moment!

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