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Neighbor keeps snapping sheer pins in his rotary mower?

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Will Herring

08-14-2007 15:37:36




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They have a mounted (via 3 point hitch) type mower that they pull with a WD45, and I have been told that whenever they go to turn and they apply a break so that they can make a bit tighter or a turn, that they constantly break the sheer pin. Any idea what the problem may be?third party image

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tim[in]

08-17-2007 15:57:03




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 Re: Neighbor keeps snapping sheer pins in his rotary mower? in reply to Will Herring, 08-14-2007 15:37:36  
Stupid me!! I looked and didnt see! It is MOUNTED bushhog!Then definitely try the orc on it. and the shaft -shake them by hand with tractor shut off. might be some slop in the pto or the bushogs shaft that may be making it snap pins easier.



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tim[in]

08-17-2007 15:53:14




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 Re: Neighbor keeps snapping sheer pins in his rotary mower? in reply to Will Herring, 08-14-2007 15:37:36  
First of all the rust on the shaft and tube where the bolt is ,is gone. Countless times of spinning after the bolt has sheared has help remove the rust and some of the metal on the stub polishing it. From my experience with my old one and a baler that had a lot of shear bolts,it will be a lot more "touchy" to all of the things the guys above have said. Plus you admitted you are using the brake to make a tighter turn.It probably has ajust a simple two joint pto shaft which makes it even touchier to make turns. If you want to make90 degree turns with a bushog, you are going to need to get a mounted one. Other wise you will keep having the problem when you turn plus the danger of a pto shaft flying around loose.lol Believe me on that one. I've mowed a lot of acres with my wd and a 5' pull type off brand bushhog.Depending on the length of your shaft, you might have to shorten it ,if you add in a over running clutch. Try the suggestions of the guys above first and if nothing helps, then try looking at it like i saidIt's a pain in tight places with a pull type, but if that alls you have then you will have to learn how to deal with using one. Which means in some turns,shutting off pto and backing up and lots of clutch work mowing into corners. I did it for over a decade on my old farm. Also make sure your blades are sharp. Should help some. Just be careful!!My grandfather would never buy a bushog because they were so dangerous.Lots of people killed by them.

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soundguy

08-16-2007 11:08:44




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 Re: Neighbor keeps snapping sheer pins in his rotary mower? in reply to Will Herring, 08-14-2007 15:37:36  
I agree with some of the others... Sounds like the mower is begging for an ORC.. ( check shaft length after instalation.. )

Soundguy



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jk

08-15-2007 16:20:55




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 Re: Neighbor keeps snapping sheer pins in his rotary mower? in reply to Will Herring, 08-14-2007 15:37:36  
proceed with caution. if you "fix" the mower, but not the problem, your could snap the internel PTO shaft in the transmission of the 45, ORC, slip clutch, sheer pin, it doesn't matter. i've seen 'em brake clean off with out so much as a squeek out of the slip clutch.



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nballen

08-15-2007 14:15:33




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 Re: Neighbor keeps snapping sheer pins in his rotary mower? in reply to Will Herring, 08-14-2007 15:37:36  
If the shear pin breaks in all mowing conditions, I would guess Mike has the answer. If the shear pin breaks only when they turn "under load", they are likely overloading the blades, and the shear pin is doing its job to protect the mower blades & drive shaft.

Just for fun, try that same turn on short grass (or the driveway / corral ) where there is no load on the mower. If it breaks, buy an ORC. If the shear pin doesn't break, lift the mower or slow down on the turns.

Nathaniel

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Skyhighballoon(MO)

08-15-2007 09:18:01




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 Re: Neighbor keeps snapping sheer pins in his rotary mower? in reply to Will Herring, 08-14-2007 15:37:36  
Sounds like the mower's rotary momentum is pushing the tractor and when the brake is applied, it can't push the tractor and snaps the shear pin? Have them try this: Disengage the power director hand clutch first before making the short turn, then apply the brake and slip the hand clutch with brake applied to make the shap turn. Best advice is to have them buy an overun PTO adapter and mount it. Mike

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william myers

08-14-2007 16:18:23




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 Re: Neighbor keeps snapping sheer pins in his rotary mower? in reply to Will Herring, 08-14-2007 15:37:36  
maybe something in the mowers gearbox,,, 3-point hitch stays pretty much in line with the pto shaft. interesting..



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