Farm Equipment - Wd ring and pinion ratio

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Wd ring and pinion ratio

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=198945
Printed Date: 12 Nov 2024 at 12:41am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Wd ring and pinion ratio

Posted By: Tombold
Subject: Wd ring and pinion ratio
Date Posted: 29 Dec 2023 at 11:10am

I have a wd with 5:14-1 ratio
7 tooth pinion 36 ring.
My research says a standard wd is 3:58-1. 12-43 ring and pinion. It is a 52 wd78606.
What is the standard ratio?

Replies:

Posted By: jaybmiller
Date Posted: 29 Dec 2023 at 11:39am

hmm, all I know is that a 6 volt( early) D-14 has a different set of gears than a 12 volt (later) D-14.

maybe one of the online parts places have the 'numbers' ??

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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water

Posted By: DrAllis
Date Posted: 29 Dec 2023 at 12:27pm

I've got the actual gear numbers at home. WD45 gas is 3.3 to 1........old WD is 3.6 to 1........D-17/WD45 diesel is 3.9 to 1. I have heard of a "corn picker" transmission for old WD's, but never seen one. A better idea would have been boost the engine HP, put a larger sprocket on the PTO shaft and throttle the engine back a little keeping the same gear ratios.

Posted By: Ed (Ont)
Date Posted: 29 Dec 2023 at 2:02pm

Make sure you count it a couple times as it is very easy to miscount. Not inferring that you can't. count. 46 ring and 7 pinion is 6.57 ratio. 12:43 is 3.58 as you said.

Posted By: Tombold
Date Posted: 29 Dec 2023 at 2:11pm

Fat fingers ment 36 tooth ring gear. Stamped on it. 5:14 ratio. I have heard of cornpicker gears back seems like Noone knows.

Posted By: Tombold
Date Posted: 29 Dec 2023 at 2:13pm

Fat finger. 36 tooth

Posted By: Ed (Ont)
Date Posted: 29 Dec 2023 at 2:14pm

Yes that’s better.

Posted By: Tombold
Date Posted: 29 Dec 2023 at 2:34pm

Is 3:58-1 standard wd?
12-43 count?
Noone has gave me a correct answer.

Posted By: Ed (Ont)
Date Posted: 29 Dec 2023 at 2:50pm

My service manual says 3.5 to 1 for WD and 3.3 to 1 for WD45. Does not have tooth count or at least I haven't found it. And that is how they list it. Do not give the 2nd decimal place. So sounds like that 12 to 43 should be the one for the WD.

Posted By: DrAllis
Date Posted: 29 Dec 2023 at 3:56pm

Old WD's are 12 x 43. WD45 gas are 13 x 43. D-17/WD45 diesel are 9 x 35. I would calculate instead of low gear being 2.50 MPH it would be 1.63 MPH with a 5.15 R & P.

Posted By: Tombold
Date Posted: 29 Dec 2023 at 4:26pm

I have 38" wheels on it and in high gear it only does 9.3 mph.