shear bolts B2782 snowblower

[smfcpacfp]

The local dealer wants $1 each for the shear bolt Nut and washer) for this unit. Does anyone know where they can be had cheaper?

 

[techman]

If they are the same as my tractor/blower, they are standard grade bolts with grooves in them. I buy bolts at home Creapo and machine the grooves myself.

Much cheaper.

paul

 

[hazmat]

I think I paid a little over a dollar for mine.

Might try tractorsmart or messicks, but shipping will probably erase any savings.

Remember Newton's (or is it Murphy's) 1st law of pto attachments. The frequency of busting shear bolts is inversely related to how many you have on hand.

Since they are expensive, I only bought a 1/2 dozen for my blower. On my attachments that take standard bolts, I buy a box (50-100) - When I've bought a box, I've never broken a bolt. $10 well spent to keep the machine up & running.

 

[smfcpacfp]

I bought a dozen of each and have used three this year.

 

[Ductape]

I bought ten @ my local dealer for $1.97 ea. ??!!

And they didn't even kiss me first.

The bolts for the auger were .64 ....... which are just a 1/4 in. grade 8. Parts guy told me these superceded the part number i gave him (that came right off the blower itself). If i even need more of those i'll just get 'em at the big box store.

 

[lakeside]

I just got around to reading your post. DON'T use grade 8 bolts as shear pins!! Grade 8 bolts (identified by five stripes on the head of the bolt) are perhaps the strongest bolts you'd ever find on the commercial market. Grade 8s are meant to be used in high load conditions where failure of the bolt could have catastrophic consequences. You'd find Grade 8s in places like truck suspensions and frame components.

Even Grade 5 bolts (three stripes on the bolt head) are too strong to be used as a shear bolt. I've used large nails in a pinch, when it was just too far to get a replacement shear bolt.

Way back I remember hearing about someone who, unwittingly, replaced a shear bolt on a truck winch with a regular bolt. It wasn't pretty.

I just went through four of the five free shear bolts that came with my new Pronovost blower. No fault of the blower, I have a gravel driveway. I bought the cheapest 1/4" bolts I could find at Home Depot and lenghtened the thread so the threaded portion is at the PTO shaft interface area. One more shear bolt and it's time for the Home Depot bolts.

 

[Chilly807]

My experience with walk-behind snowblowers has been that shear bolts are grade 2. If you have a SAE bolt that has no head markings, it's generally a grade 2. I'd like to say it is a grade 2 every time, and it should be, but with our markets flooded with imports anything is possible.

Chilly

 

[lakeside]

Just a correction, Grade 8 bolts have six stripes on the bolt head instead of what I posted, five.

 

[robbo323]

I went to get a couple makeshift shear bolts at Tractor Supply Co on a weekend when my dealer was closed & when I grabbed some low grade bolts, the clerk there told me that I had it backwards - that low grade would "give" and flex rather than break when it should and said I needed grade 5 or 8 that - being more rigid & inflexible - would snap when they should. Can someone clear this up for me?

 

[StrangeRanger]

Some larger machines will use grade 5 for a shear bolt, but dollars to donuts on our size machines 99% of the time it's grade 2. Never grade 8.
I got to TSC b/c they have nice bins labeled clearly as to the grade. I simply buy bulk and cut to length needed.
It's also important to remember to keep your shear bolt tightened down very snug. If you keep it tight it will shear when it's supposed to better.
As much as a PITA it is to replace shear bolts, I'd rather replace them than other parts. See my posts from last year regarding the FOURTH gear box I'm on for my blower. Grrrrr...
j

 

[Chilly807]

I went to get a couple makeshift shear bolts at Tractor Supply Co on a weekend when my dealer was closed & when I grabbed some low grade bolts, the clerk there told me that I had it backwards - that low grade would "give" and flex rather than break when it should and said I needed grade 5 or 8 that - being more rigid & inflexible - would snap when they should. Can someone clear this up for me?

I'm thinking you're right, grade 2 is fine for a shear bolt. Grade 8 is a much stronger bolt, I've never seen them "properly" used in a snowblower.

I'm not saying it's impossible, only unlikely.

Chilly

 

[JTPass]

I have a question...What is the purpose of the groove on the auger shear bolt for the B2782 snowblower?

 

[lakeside]

I suspect the groove is there to create a weak point. Perhaps even a grade 2bolt is too strong for that type of machine. Just a guess though.

 

[ptrotter]

I have always been told that grade 8 bolts are better as shear bolts as they are more brittle than lower grade bolts and will shear better. Lower grade bolts have a tendency to bend and stretch rather than break. I believe that higher grade bolts are stronger in tension, but not as strong in shear. The 2782 has 2 different shear bolts, the auger bolts with the groove and the other on the shaft that Kubota specifies as a standard grade 8 bolt. I haven't looked closely at the auger shear bolts from Kubota to see what grade they are. I have used grade 8 bolts as shear bolts on my larger rotary cutter and have had no problem with them, they shear off nicely.

 

[Kubota 2350]

My front mounted snow blower on my Kubota 2350 calls for grade 8 in the rear rotor, and grade 5 in the augers.

 

[StrangeRanger]

My front mounted snow blower on my Kubota 2350 calls for grade 8 in the rear rotor, and grade 5 in the augers.

They may call for grade 8, but that's probably why they have the "special" groove in them, to create a weaker point???

 

[radair]

...I believe that higher grade bolts are stronger in tension, but not as strong in shear...

No, this is not true.

 

[Gomer]

I have a 900ft driveway and live in west Michigan and use said blower on my B2630 so I think I qualify as having some knowledge on this subject.

I can tell you from experience that for the back blower, grade 2 bolts will sheer just with the snow load, grade 5 will last a little longer, and grade 8 is what comes on it and what Kubota sells for replacement and will sheer with wood or dog nylabones.

 

[Chilly807]

Well, whatever the manufacturer calls for should be what goes in them.. quite often we like to second guess them based on our own experiences.

Chilly

 

[Erallain]

I have 2 shear bolts in front of me. #1 has a letter N at the 12:00 position. #2 has letters YHC at the 12:00 and hash marks at the 2:00, 6:00 and 10:00 positions. So reading the previous posts..am I correct that #1 is a grade 2 and #2 is a grade 5? Should I use the grade 5 for the fan or the Grade 2. Thanks.