shear bolt blues, need advice

[Ford960]

Soundguy,

No, it's definately a 5/16" hole for the shear bolt in my PTO shaft. The shaft has 2 mating flanges that extend out with the bolt hole in them. Both ends of my shaft are splined. I haven't looked it up but I think that a 5/16" grade 5 is comparable to a 1/2" grade 2 in shear strength. BTW, I find sometimes that the nut has backed off and the bolt is loose and I need to double nut it.

 

[Soundguy]

Both ends of the shaft are splined? I assume you mean at the tractor and gear gox.. and then there is an inline couple that has the shear bolt?

Go with whatever your manufacturer and your wallet say is fine.

Soundguy

Soundguy,

No, it's definately a 5/16" hole for the shear bolt in my PTO shaft. The shaft has 2 mating flanges that extend out with the bolt hole in them. Both ends of my shaft are splined. I haven't looked it up but I think that a 5/16" grade 5 is comparable to a 1/2" grade 2 in shear strength. BTW, I find sometimes that the nut has backed off and the bolt is loose and I need to double nut it.

 

[Ford960]

I see that some cutters have a smooth gear box input shaft with a hole in it for a shear bolt but both my cutters have a splined shaft. With the smooth shaft I can see that there would be 2 shear points whereas my set-up has one.

 

[firemanpat2910]

My 2910 has the 8-2 standard gear tranny. I dont recall anything in the manual about feathering but I will look when I get home. I will atempt to show how my shear pin works (Get ready to laugh)

 

[firemanpat2910]

this is ugly if it even works
Black= 2 splined shafts one on gearbox other is on the attachment end of pto
red is splined collar on gearbox
blue is splined collar on Pto
gray is shear bolt.

 

[Ford960]

this is ugly if it even works
Black= 2 splined shafts one on gearbox other is on the attachment end of pto
red is splined collar on gearbox
blue is splined collar on Pto
gray is shear bolt.

You're right that's an ugly drawing, did you use a crayon?
That's exactly what my shear bolt setup is. Let me go brave the rain a get a picture of mine.

 

[Soundguy]

this is ugly if it even works
Black= 2 splined shafts one on gearbox other is on the attachment end of pto
red is splined collar on gearbox
blue is splined collar on Pto
gray is shear bolt.

Good enough pic.. I know exactly what you mean.

Check that manual. Do you have the oem blue/white cover NH manual?

Soundguy

 

[firemanpat2910]

No I bought the maual from somewhere I found on here. I think it is a copy of the orriginal but Im not sure. I have read it many times and dont remember feathering but I will give it a try, If it works I owe you an adult beverage of your choice. After all the tractors are parked for the day of course. Oh and 960 I cant play with crayons any more, mom caught me writing on the walls 40 years ago and took them all away. that was back when we only got about 8 colors to the box.

 

[Soundguy]

What year of machine is that 8x2 tranny on.

If pto the handle is roundish bar with a bend out away from the tractor and is an open design, with no guide.. then it is one of those things you just have to 'feel' while shifting.. that is.. you can feel whent he hyd clutch starts to load up. if it is the newer 8xs tranny and has a pto handle that is a piece of flat stock that is setting in a bracket and runs along a guide, that is the one that you have a better idea of where the pto starts to engage, as when the handle moves just out of it's cradle position is where the 1-2 second feather begins.. etc.. ) It's also a stiffer movement than the old style.

Let me know which style you have.

Soundguy

 

[firemanpat2910]

88 2910 series II . It has the flat stock bar in the guide with the indention in the guide to hold lever engaged. Ihave tried moving it slowly but never thought to wait 2 sec and then slide slowly. It does seem like it takes a sec or 2 to start turning after I move the lever.

 

[Soundguy]

The 2 seconds is what I consider an overall time. i try to make my move smoothly.. and take about 1.5 seconds or so to be gein engaging.. and then as soon as the first movement starts, use the other hald second to finish engaging so as to not wear the pto clutch.. In any case.. you have the same 'new' style trans setup that I do. My 1975 5000 has the old style.. no guide.. easer to move.. etc.

Soundguy

 

[firemanpat2910]

Wow you learn something every day thanks alot. I have always shuddered when engaging the pto. Most all of the other tractors Ive driven you used the half clutch method.

 

[firemanpat2910]

double checked the "jensales" manual last night, nothing about feathering,just says to idle down before engaging. But I will give it a try next time I get on the tractor.. Im hoping to use the boat instead this weekend but you never know.

 

[Soundguy]

double checked the "jensales" manual last night, nothing about feathering,just says to idle down before engaging. But I will give it a try next time I get on the tractor.. Im hoping to use the boat instead this weekend but you never know.

If you have a fax number that you would like to PM me with.. I'd be happy to copy the page out of my 5610/6610/7610 manual that speaks about feathering the independent pto to the engaged position.

If no fax... a snail mail address will be fine.. I can xerox a copy off and stuff it in an envelope.. and you can just add it tot he jensales manual...

have a good one!

Soundguy

 

[Ford960]

Im hoping to use the boat instead this weekend but you never know.

Hey Pat,
How long does it take to shred an acre using the boat?

 

[Soundguy]

That's what? an 8" cut? (grin)

But if it starts raining.. you are -fine-!!

Soundguy

 

[firemanpat2910]

Thanks soundguy, I tried every way I could to feather in the PTO this weekend but it still seems there is no "slipping" it in like with a clutch. Its on or off. I dont know if its the same as on your tractors or not. When the motor is off the pto is free turning, they mention in the book that this is too make hook up easier on ptp splines. When the tractor is running the pto shaft is locked tight. Possibly the pto break is not letting go until all of the feathering space is used up. And to 960: my jet drive boat has a 12" intake grate so it would take a while. but I have been known to shred a trail of sea grass through the flats. but when the grate is clogged you have to dive under the boat to clear it.

 

[Soundguy]

I think with more use feathering, your pto clutch will smooth up.

When I first started using mine.. there was no noticeable slip area.. but now I can feel it.

I did some checking, and your independent pto arangement is virtually identical to mine, per the CNH dealer.. As a matter of fact.. most of the late model 8x2 trannies are virtually identical in function..e tc.

Perhaps with more use it will free up some. If yours feels anything like mine.. .. it takes a significant amount of pressure to shift mine... thus making it hard to feather without it jambing all the way over when it finally gives.

Have fun!

Soundguy

 

[Highbeam]

"Anyone with an HST care to drop in and give info about your pto clutch setup.. list makes and model, and size.. etc. any other helpfull info you might have too."

Kioti CK30, 30 HP, the PTO is solidly engaged with a lever. Ahead of the HST there is an engine clutch with a pedal. I idle the engine, disengage engine clutch, throw PTO lever to ON, slowly engage the clutch (slowly turing PTO), and then increase RPMS to PTO540. Blades spinning full speed and the HST allows variable speed and direction without clutching or slowing blades.

I love my slip clutch.

 

[Soundguy]

Your system works like a 2 stage clutch setup.. in that you can clutch engine and pto by hitting the clutch, or just stop drivetrain momentum by using HST pedals.

Soundguy