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801(?) is shearing pins

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Addy

07-27-2005 20:21:17

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Hello,
We recently purchased a tractor that is probably an 801 diesel (still haven"t been able to locate the model numbers). It has a live pto that only shuts off when the clutch is depressed. Is this normal? We have added a 5 foot brushhog and the pin into the gearbox on the brushhog is sheared off almost every time you let out on the clutch. When it doesn"t shear the old tractor is wonderful. Any suggestions? Thanks in advance. Addy

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mhb@ufe

07-30-2005 08:52:50

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Re: 801(?) is shearing pins in reply to Addy, 07-27-2005 20:21:17

You didnt say the make and model of yoour mower however for many brands Tisco offers replacment shafts with a slip clutch for a reasonable price

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MarkB_MI

07-28-2005 03:29:48

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Re: 801(?) is shearing pins in reply to Addy, 07-27-2005 20:21:17

When the PTO lever on the left hand side of the tractor is pushed forward, the PTO should not run, regardless of the clutch position. If your PTO doesn't stop, then it sounds like you've got a problem with the PTO.

As far as breaking shear pins goes, that doesn't sound like a tractor problem. I assume you're using grade 5 bolts for shear pins.

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Addy

07-28-2005 11:21:37

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Re: 801(?) is shearing pins in reply to MarkB_MI, 07-28-2005 03:29:48

Sounds like it's a PTO problem. The lever doesn't have any effect at all. As far as the pins, the manufacturer and dealer both said to use grade 2 pins. We've been considering an upgrade to 5 but wasn't sure what would happen if that was too hard.

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awhtx

07-28-2005 19:55:20

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Re: 801(?) is shearing pins in reply to Addy, 07-28-2005 11:21:37

I have tried grade 2 bolts in the driveline of my shredder and they shear quickly- even tall grass will cause them to shear. Switched to grade 5 and they last a lot longer but they will shear if I hit something solid so my PTO is still protected.

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MarkB_MI

07-29-2005 03:42:31

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Re: 801(?) is shearing pins in reply to awhtx, 07-28-2005 19:55:20

It wasn't my intention to start a fight about grade 5 versus grade 2 shear pins, but I guess it was inevitable. My point was only that if Addy is using grade 5 bolts and they are shearing as soon as the clutch is engaged, then there must be something seriously wrong with her brush hog.

I would expect grade 2 bolts to shear under the conditions she describes.

Personally, I use grade 5 bolts on my brush hog. Otherwise I'd have to stop every five minutes to replace the shear pin.

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souNdguy

07-28-2005 21:16:47

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Re: 801(?) is shearing pins in reply to awhtx, 07-28-2005 19:55:20

I hope you are prepaired to start driving around the country and doing free pto/tranny /mower repairs for people. You are advocating using a much harder shear pin than most manufacturers call for. The reason for the soft pin is to have it shear before things like gears and couplers do.

Most causes of pins shearing too quickly is engaging the pto while engine speed is too high.. or a worn yoke that has some play that makes the pins shear when brought under heavy loads.

Best advice to give people is to use whater shear pin their mowers manufacturer stated to use.. etc.. And if that doesn't work.. find out why...

Soundguy

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Rod F.

07-29-2005 06:42:15

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Re: 801(?) is shearing pins in reply to souNdguy, 07-28-2005 21:16:47

I think the best policy regarding shear boolts is to simply use what the OEM recomended. I've got quite a bit of equpment that doesn't use either grade 2 or 5, but 8, and nothing less will do. Grade 5 would be predominant on most of my equipment. Again, that's back to what the OEM calls for, not what any of us stick in there, and got away with.

Rod

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john_bud

07-28-2005 07:33:59

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Re: 801(?) is shearing pins in reply to MarkB_MI, 07-28-2005 03:29:48

Did you check that the cutter spins freely when not attached to the tractor? (mine will spin with 1 finger...) Is the driveline between the tractor and cutter staight? Are you using the correct size shear bolt?

Don't mean to sound like an A-- but, do you have the engine RPM's around 1000 when you slowly slowly ease up on the clutch? Then after the clutch is up, you bring up the RPM's to operating speed? I apologize if this is obvious, but I have seen people bring the engine to 2200 rpm and side step the clutch to engage the PTO before. Doh!!

If the cutter is good, the driveline is good and you are using the proper technique to engage the PTO, then you have a mystery on your hands!

I also thought that shear bolts were supposed to be grade 2? Have I been using the "wrong" grade?

John_Bud

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Addy

07-28-2005 11:28:47

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Re: 801(?) is shearing pins in reply to john_bud, 07-28-2005 07:33:59

Thanks for the info. I think everything we've tried has been pretty close to what you describe. Since the PTO doesn't disengage when the lever is pressed forward I think we may have a problem with the linkage. I'll replace the pin today and try once more. Hubby will be home this weekend and he can check the link between lever and PTO. Being newbies to the tractor world is an eye-opening experience. Love that power!!!
Addy

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WBinPA

07-28-2005 19:02:28

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Re: 801(?) is shearing pins in reply to Addy, 07-28-2005 11:28:47

The part of the PTO lever which is inside the tractor moves a sliding coupler to engage and disengage the PTO. The coupler is hardened steel, the lever, mild steel. If you remove the round cover containing the PTO lever and dipstick, you can inspect for wear. Be sure to turn of the engine first. I don't remember if you will need to drain a little oil from the rear first.

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