Swhitching Cat. II to cat. I
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=138654
Printed Date: 29 Dec 2025 at 6:32am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Swhitching Cat. II to cat. I
Posted By: BradH
Subject: Swhitching Cat. II to cat. I
Date Posted: 22 May 2017 at 8:32am
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Had a guy tell me I could have his old three point blade the other day. He replaced it with one that swings with hydraulics. I went to look at it and it has category II lift arm pins. I only have category I arms. I have a set of Cat I pins I can steal out of something else to get it home with, but are the threaded ends of cat I and cat II pins the same size? Or will they be too small and leave it with slack in the holes? My coffee isn't making me alert today, just shaky so I hope this makes sense. Thanks, Brad
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Warning! Blind man with a tractor! Head for the hills!
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Replies:
Posted By: allisrutledge
Date Posted: 22 May 2017 at 8:40am
Most are larger, I have put cat 1 pins on the inside of cat 2 impliments before but it depends on the sway blocks or stay bars on the tractor you are using. I think cat one is 26" and cat two is 30 inches at the pin mounts. Scott
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Allis Chalmers still exist in my mind and barns
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Posted By: shameless dude
Date Posted: 22 May 2017 at 8:45am
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you can buy what ever size cat I pins you need, or you can buy adapters for it. there is an andapter made (found at about any farm store) that will slide onto the cat II pins, and on the other end has the cat I pin for your tractor.
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Posted By: Bull
Date Posted: 22 May 2017 at 8:48am
If it is too wide and the blade design allows you can turn the pins to the inside to narrow it down.
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WD45 Diesel, RC,CA,IB, B, G, 616, Early B-10, D-10, Terra Tiger, 95G spreader, SC blade
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Posted By: Gerald J.
Date Posted: 22 May 2017 at 9:56am
Checking Baum Hydraulics catalog section C, the threads for category 1 are 7/8" like the pin diameter, and category 2 threads are 1-1/8" like the pin diameter. I don't see an adapter or special pin to fit a category two hole and supply a category one pin. But there is one to fit a category 1 hole and provide a category 2 pin. It would be great if that is what is in the blade. There are 7/8 to 1-1/8" sleeves, too long for the threads but can be sawed shorter to bush the large holes for the smaller pins. Need sturdy flat washers to finish that adaption. Two per pin. Baum also has a pin with 1" threads that is double ended with 7/8" pin on one end and 1-1/8" pin on the other end.
Bomgaars and Theisens and other farm stores should have similar parts on hand. As well as farm equipment dealers.
Decades ago I made category one lift pins to fit category two mounts for a JD row cultivator and for a rotary hoe using steel stock and my metal lathe. Worked the cat 1 tractor hard but didn't break anything.
Gerald J.
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Posted By: Gary Burnett
Date Posted: 22 May 2017 at 12:36pm
Agri Supply has the step up and step down pins
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Posted By: BradH
Date Posted: 22 May 2017 at 5:14pm
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Okay, I figured somebody probably made what I needed. I was looking at the shelf at the local Orchlens and didn't see what I needed. I forgot about the width but I can turn them to the inside and probably get by. We've got a two bottom plow, not sure what kind. It's cat. I but the pins were wider than standard cat I pins. We had to take one lift arm off the little tractor to get it hooked up. Thanks, Brad
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Warning! Blind man with a tractor! Head for the hills!
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