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dfwallis 
Orange Level
Joined: 09 Mar 2023
Location: DFW
Points: 669
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 Topic: CA PTO Shear Bolt/Shaft Direction
Posted: 30 Apr 2025 at 1:07pm |
New mower has label pointing the end with the shear bolt toward the tractor. There are two issues with this:'
1) The shear bolt is on a 1.5"+ protrusion off to the side of the Ujoint and nearly hits the top link bracket attached to the rock shaft.
2) This would cause water to run into the PTO shaft because the open end of the sheath would be pointed upward.
I intend to mount it in the other direction because there is plenty of room for the shear bolt protrusion on the implement, and I want the sheath pointed downward to preclude water intrusion. I also may install my new slip clutch on the implement if the geometry/length works. There's no way the slip clutch would clear the rockshaft attached top link bracket.
Issues?
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1952 CA13092
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Jim.ME
Orange Level
Joined: 19 Nov 2016
Location: Maine
Points: 959
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Posted: 10 hours 12 minutes ago at 5:32pm |
A slip clutch belongs on the implement, not the tractor PTO shaft. An over-running clutch goes on the tractor's PTO shaft.
With a slip clutch you don't need the shear bolt set up.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 85654
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Posted: 9 hours 56 minutes ago at 5:48pm |
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we alway put the shear bolt on the mower deck end.... many mowers have the gear box INPUT shaft as ROUND with the bolt thru it... not a HEX drive like the tractor PTO.
Edited by steve(ill) - 9 hours 55 minutes ago at 5:49pm
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Like them all, but love the "B"s.
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dfwallis
Orange Level
Joined: 09 Mar 2023
Location: DFW
Points: 669
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Posted: 8 hours 25 minutes ago at 7:19pm |
 Jim.ME wrote:
A slip clutch belongs on the implement, not the tractor PTO shaft. An over-running clutch goes on the tractor's PTO shaft.
With a slip clutch you don't need the shear bolt set up. |
That's where I intend to install it. The PTO shaft itself already came with a shear bolt and markings indicate to attach it to the tractor. But I thought that was not the best approach, and not suitable for a 3 point modded CA.
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1952 CA13092
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dfwallis
Orange Level
Joined: 09 Mar 2023
Location: DFW
Points: 669
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Posted: 8 hours 24 minutes ago at 7:20pm |
steve(ill) wrote:
we alway put the shear bolt on the mower deck end.... many mowers have the gear box INPUT shaft as ROUND with the bolt thru it... not a HEX drive like the tractor PTO. |
Thanks, This one has a normal 1 3/8 PTO 6 spline on the implement.
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1952 CA13092
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dfwallis
Orange Level
Joined: 09 Mar 2023
Location: DFW
Points: 669
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Posted: 7 hours 7 minutes ago at 8:37pm |
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I'm thinking I may just turn the shroud around if I ever have to modify it (shorten, etc.) so other's (brothers, nephews, etc.) don't install it with the shear bolt toward the tractor.
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1952 CA13092
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 53300
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Posted: 7 hours 1 minutes ago at 8:43pm |
dfwallis wrote:
I'm thinking I may just turn the shroud around if I ever have to modify it (shorten, etc.) so other's (brothers, nephews, etc.) don't install it with the shear bolt toward the tractor. |
Likely that's what happened at the factory, got it put together backwards... Don't operate it that way, or you'll un-mow your lawn...
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