wc,wd speeds
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Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=75552
Printed Date: 23 Nov 2024 at 11:50pm
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Topic: wc,wd speeds
Posted By: wcallispuller
Subject: wc,wd speeds
Date Posted: 21 Aug 2013 at 8:58pm
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Does anybody know the difference in 1st gear speeds on a WC, WD, WD-45, if they all had the same size tire and running the same RPM's? In looking at the manuals and Nebraska test it appears that they all had a rated speed of 2.5 mph in 1st gear, but ran different size tires. So where the rearends geared different?
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Replies:
Posted By: BennyLumpkin
Date Posted: 21 Aug 2013 at 9:16pm
I did a quick search and I know its been specifically covered with actual ratios. WC is the fastest, followed by WD, and WD45 then WD45 diesel in order to slowest. The things that can vary that is using an RC rear in a WC or using a speed patrol/maintainer rear.
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Central PA Allis Express
1934 WC254
1945 WF
1945 WC135755
1951 WD68085
1953 WD45-150217
1957 WD45D-230744D
B110
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Posted By: DrAllis
Date Posted: 21 Aug 2013 at 9:52pm
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The actual internal transmission gears between a WC and old WD are exactly the same parts (just located in a different case) and are 2 1/2...3 3/4...5 MPH. The WC is rated at 1300 rpm and WD at 1400 rpm but the slower ring & pinion and final drive ratios in the WD allow for 100 more RPM and maybe a little bit bigger rear tire and still wind up with almost the same actual ground speed. The late WD and all WD45's had a slower 1st gear of 2 1/3 MPH but second and third gear were still 3 3/4 and 5 mph. As I understand it, the slower low gear was for harvesting of better crops as years went by. The WD45 diesel ran 1625 RPM so the rearend ring and pinion was slowed down to make the ground speeds once again 2 1/3....3 3/4.....5 MPH even with the engine running at 1625 RPM. A-C always wanted 2nd and 3rd gear to be for plowing and discing and knew what MPH generally worked the best. Another way to look at this would be a WC running at 1400 RPM will be traveling 2.7 MPH instead of 2.5 MPH at 1300 RPM. (2.5 mph times 1400 rpm divided by 1300 rpm equals 2.7 mph).
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Posted By: wcallispuller
Date Posted: 21 Aug 2013 at 10:29pm
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Thanks for the info guys it was a great help.
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Posted By: BennyLumpkin
Date Posted: 22 Aug 2013 at 5:25am
He's such a better "explainer" than me lol
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Central PA Allis Express
1934 WC254
1945 WF
1945 WC135755
1951 WD68085
1953 WD45-150217
1957 WD45D-230744D
B110
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Posted By: Glockhead SWMI
Date Posted: 22 Aug 2013 at 8:04am
I'd like to know Dr Allis history. This is a man that has obviously done something! The amount of allis info he has from the little tractors right up the the latest tractors allis had to offer is staggering.
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