Shear Pin Shocker

JohnMiller3 · Jul 21, 2003

(...$8 or $6 per shear pin ...) 

Hey Bill...

You're not using that broken calculator again... Are ya? /forums/images/graemlins/wink.gif

Henro · Jul 21, 2003

You're not using that broken calculator again... Are ya? 

Nope! Just repeating what was reported above in this thread. I can't comprehend it, but I don't doubt what the guys are reporting... /forums/images/graemlins/frown.gif

The CHEAP ones were $5.50 each...amazing...

JerryG · Jul 21, 2003

The Bush Hog model 2101 uses the same gear box as the model 2102, but the 2101 uses a lighter duty pto shaft. This is the reason that the 2101 uses a pin without a head that has a 3/8" shaft and is necked down on the threads to 5/16". Bush Hog does not recommend the threads on the yoke be drilled out and the pin replaced with a 3/8" bolt because of the lighter duty pto shaft. Bush Hog will not warranty the pto shaft if the pin is replaced with a bolt.

JohnMiller3 · Jul 21, 2003

/forums/images/graemlins/laugh.gif
(...Grade two bolts go for $1.19 per lb ...)

Hi Bill...

I had quickly seen this and forgot about the rest of the thread... /forums/images/graemlins/blush.gif

JohnMiller3 · Jul 21, 2003

(...has a 3/8" shaft and is necked down on the threads to 5/16"....) 

What part of the bolt is in the "shear" area?

Without physically seeing it... off the cuff, why couldn't you use a standard Grade 2 - 5/16" bolt? (without drilling it out)

JerryG · Jul 21, 2003

John,
One side of the yoke is drilled 3/8" and the thread side of the yoke is 5/16". The pins shears at 3/8" on one side and shears at 5/16" on the other side. According to BH the combined shear of 5/16 and 3/8 is the required amount for that pto shaft. A total shear of both sides at 3/8 would be to much for that shaft. If you just put a 5/16" grade 2 bolt in, then the 5/16 would only be tight on the threaded portion thus the input shaft would have slop on the yoke all the time.

JohnMiller3 · Jul 21, 2003

I understand the taper you're saying, but won't the "nut" keep the tension on the 5/16" bolt... thereby attenuating any "slop"?

JerryG · Jul 21, 2003

All of the un-threaded portion would be slop.

Slamfire · Jul 21, 2003

At $6 to $ 8 a pop, you'd think a slip clutch could be payed for inside a week. /forums/images/graemlins/smirk.gif

kensfarm · Jul 22, 2003

"I got the slip clutch anyway"

Henro.. I was wondering.. w/ the slipclutch.. how many shearbolts have you gone through?

I can't believe $8 a pop.. w/ that price I know one post hole that would have cost me almost $50 to dig.. lot's of roots.