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Allis Chalmers 712H bevel gear box

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Mikez View Drop Down
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Joined: 16 Jan 2013
Location: Usa
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikez Quote  Post ReplyReply Direct Link To This Post Topic: Allis Chalmers 712H bevel gear box
    Posted: 03 Aug 2022 at 10:27pm
With it shut off grab the pulleys sticking out each side and see what they feel like. Spin by hand. 
You sure those were spinning when engine was running. The left pto side only the outer part of the clutch will spin unless the lever is engaged. But something should be spinning 
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ma2022 View Drop Down
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Joined: 28 Jul 2022
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ma2022 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2022 at 11:32pm
Thanks all for the replies. I think the coupler is still good on the engine. That makes a lot of sense about the keys. When I have the chance I will check that. Thanks again for the direction I appreciate it. 
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Steve in NJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2022 at 8:49am
Gary is correct. In lot's of cases, I've found the key in the input shaft of the BGB fails allowing the driveshaft to turn. The problem is sometimes they booger up the imput shaft or does some damage to the keyway where it would lead to pulling the BGB out and getting the keyway/shaft repaired.  HTH
Steve@B&B
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Gary View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2022 at 7:16am

I believe some of the belt pulleys or bevel gears are keyed to the shaft.

I'd first check for a failed key.

Start by removing the belt and turning the the belt pulley.

G
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HudCo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2022 at 10:43pm
is the coupler on the engine good ?
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ma2022 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ma2022 Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2022 at 4:09pm
Hello,

I'm new to garden tractors and don't know a lot but have been working on my grandparents Allis Chalmers 712H. I replaced the carburetor and the engine starts and runs great. The driveshaft spins but there doesn't appear to be any output from the bevel gear box. The belts don't spin. Am I right in assuming that the beveled gear box needs to be replaced? 
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