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M Crawler Charging System
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Lingle View Drop Down
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Joined: 30 Sep 2022
Location: Iowa
Points: 29 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lingle Quote  Post ReplyReply Direct Link To This Post Topic: M Crawler Charging System
    Posted: 04 Apr 2025 at 7:01am
Good day, I have a M crawler that runs great, someone put in a 12V battery but despite it having the provisions for a generator, there isnt one on the tractor so I have to jump start it sometimes.  Anyone have photos of a M crawler, or a U tractor as I think they share the same engine, that could send some photos of the charging system on the engine?

I got the crawler from MN from a Allis guy, thing is a beast so wanting to add a charging system and re-patch the block, seems like block cracking was common on these as both of my M's have cracked blocks.
35 and 41 WM crawlers, 49 WD, 53 WD45 wide front, 49 JD A, 52 JD B
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PaulRoidt(WI) View Drop Down
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Joined: 11 Sep 2009
Location: Montello WI
Points: 136 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulRoidt(WI) Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2025 at 7:59am

The generator is on backwards in this photo.
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Lingle View Drop Down
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Joined: 30 Sep 2022
Location: Iowa
Points: 29 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lingle Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2025 at 9:35am
Thanks!  I may try to make a strap to go over the mount, what I wonder, as I havent removed it, is how do you replace the belt and tension it?  Im lucky to have a 12V generator from a WD or WD45 with a external regulator that I could likely use, just need to think about the belt tensioning.  Alternatively I could use a 12V internally regulated alternator, just have to make sure the speeds are high enough to charge appropriately.
35 and 41 WM crawlers, 49 WD, 53 WD45 wide front, 49 JD A, 52 JD B
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PaulRoidt(WI) View Drop Down
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Joined: 11 Sep 2009
Location: Montello WI
Points: 136 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulRoidt(WI) Quote  Post ReplyReply Direct Link To This Post Posted: 15 hours 56 minutes ago at 8:05am
Probably have to take the mag off.  That shaft probably only turns 650 rpm high idle.  The bracket that the generator is strapped to is slotted for adjustment.
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Les Kerf View Drop Down
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Joined: 08 May 2020
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Points: 1014 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 15 hours 4 minutes ago at 8:57am
Originally posted by Lingle Lingle wrote:

...  Im lucky to have a 12V generator from a WD or WD45 with a external regulator...

If your generator is in serviceable condition I would certainly use it rather than spend money on an alternator. A voltmeter, rather than the original ammeter, is recommended.

Does your generator have an actual regulator or is it just a cutout relay? It makes a difference as to the actual wiring needed.
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