PTO bolt
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=193353
Printed Date: 27 Apr 2024 at 6:09pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: PTO bolt
Posted By: mdm1
Subject: PTO bolt
Date Posted: 07 Feb 2023 at 2:32pm
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I was blowing snow with the WD-45 today at the cabin and all was well then not well. The pto shaft stopped going. The bolt for the gearbox to extension shaft was gone. Is this a special shear bolt? I will buy the bolt, but if I can source it locally I would prefer that. What does everyone else use? What size bolt would I need if I can just use a bolt? Thanks for a reply. Mike ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Replies:
Posted By: KMAG
Date Posted: 07 Feb 2023 at 3:45pm
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A pic would help verify this, but it is highly likely the missing piece was a shear bolt. I would only replace it with same or weaker spec shear bolt. |
Posted By: mdm1
Date Posted: 07 Feb 2023 at 3:49pm
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The factory bolt is a shoulder bolt. Just checked with a Agco dealer and price was around $30.00. ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Posted By: steve(ill)
Date Posted: 07 Feb 2023 at 3:57pm
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most probably just use a soft grade 2 plated bolt from the hardware store.. You need a lock nut or something to keep it from falling out... should shear the bolt if you hit something hard. ------------- Like them all, but love the "B"s. |
Posted By: mdm1
Date Posted: 07 Feb 2023 at 4:00pm
------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Posted By: den/southern illinoi
Date Posted: 07 Feb 2023 at 4:07pm
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Do not do what one guy did. He was buying his second pto gear from me when I asked him what he was using for a bolt. He said a Grade 8. I told him he needed to go way softer. He has not been back I'm guessing he took my advice. Den ------------- Own 5 720 garden tractors with associated equipment,1 620 garden tractor, 4 wheel 20 2-5015, 5020 and associated equipment and 2 electric forklifts. |
Posted By: steve(ill)
Date Posted: 07 Feb 2023 at 4:13pm
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the shoulder is so you can bottom out the nut and have it TIGHT so it will not back off... Using a selastic nut with a grade 2 bolt will do the same think... dont want the nut to vibrate off.
------------- Like them all, but love the "B"s. |
Posted By: mdm1
Date Posted: 07 Feb 2023 at 4:39pm
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Thanks for the input. But since I don't have the old bolt does anyone know the size? I can't measure because the tractor is 2hrs away. Sorry to be a bother. ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Posted By: steve(ill)
Date Posted: 07 Feb 2023 at 4:41pm
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I have seen 7/16 and 1/2 inch in various shafts .... just take a couple bolts... if they are an inch too long, that dont hurt.
when you get the size, keep a couple spares in the tool box.  ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 07 Feb 2023 at 4:46pm
------------- Like them all, but love the "B"s. |
Posted By: mdm1
Date Posted: 07 Feb 2023 at 4:47pm
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Thanks I didn't want to just put a bolt in and do more damage. Learning things as I get older. ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Posted By: DrAllis
Date Posted: 07 Feb 2023 at 6:10pm
| The design of the bolt is such that when you tighten the nut tight, you are not crushing the tube onto the PTO output shaft. The bolt floats in the hole. |
Posted By: JC-WI
Date Posted: 07 Feb 2023 at 8:15pm
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Make sure you don't have threads in the bolt hole when drawing nut up tight. ------------- He who says there is no evil has already deceived himself The truth is the truth, sugar coated or not. Trawler II says, "Remember that." |
Posted By: IBWD MIke
Date Posted: 08 Feb 2023 at 9:54am
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Doc makes a good point. If you ever want to pull the pto shaft, which is recommended for moldboard plowing, you don't want it crushed. My thinking, and I could be totally wrong, is that bolt was NOT designed to be a shear bolt. |