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Dr_Woof


Don't blow into the wind, and don't eat yellow snow. WOOF!

Location: Saskatchewan
Joined: Dec 13, 2010
Points: 253

Honda HS928TCD auger shear pins - two types available
Original Message   Jan 20, 2011 10:43 am
I have a new Honda HS928TCD blower.  Apparently a change was made in the past for the shear pins for the HS928 so now there are two types available, depending on the frame serial number. The older style pins have a P/N of  95701-06016-00 and the newer style is 92101-06016-0A. Since I have a bunch of the older style shear pins, I am wondering what the nature of the change was and if the older type of shear pins will work for the newer model.  If the old style is used on the new frame type, is there a danger to the gearcase because the shearing point is different?  See  http://www.boats.net/parts/search/Honda/Snow%20Blower/0/HS928%20WAS%20SNOW%20BLOWER%2C%20JPN%2C%20VIN%23%20SZAS-1100001%20TO%20SZAS-1129999/AUGER/parts.html for the illustrations.  Any ideas out there?

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Dr_Woof


Don't blow into the wind, and don't eat yellow snow. WOOF!

Location: Saskatchewan
Joined: Dec 13, 2010
Points: 253

Re: Honda HS928TCD auger shear pins - two types available
Reply #19   Jan 23, 2011 10:50 am
Not an option fpor the Honda.  But does it blow snow too?  Would be nice to listen to a little Mozart while following the Yamaha  LOL.  Comment from Mr. Rubinew??

Underdog


Joined: Oct 18, 2008
Points: 332

Re: Honda HS928TCD auger shear pins - two types available
Reply #20   Jan 23, 2011 11:43 am
Is there such thing as a "metric" grading system for bolts that is different from a non-metric "grading system" for bolts.

Or is a grade "8" all there is.  I am not familiar with the grading system for bolts.  "8" sounds pretty hard (or strong) to me.

I would think that we would be looking for a softer bolt to protect our auger gear box.

Bill_H


Location: Maine
Joined: Jan 12, 2008
Points: 354

Re: Honda HS928TCD auger shear pins - two types available
Reply #21   Jan 23, 2011 12:11 pm
There are grading systems for bolt strength in both SAE and metric. SAE are tested in PSI, metric in MPa.

Unmarked: minimum yield strength is 57,000 PSI, metric unmarked is 640 MPa. Minimum tensile strength for these are 74,000 psi or 800 MPa.

Unmarked bolts are untreated low or medium carbon steel. Grade 5 and metric 8.8 are medium carbon steel, heat treated and tempered. Grade 8 and metric 10.9 and 12.9 are heat treated and tempered alloy steel.

The higher the grade, the stronger the bolt. You want shear pins to be weak. They're supposed to break. The stronger they are, the more stress you apply to parts that are not designed for it.  Repeated stresses will cause failure.
This message was modified Jan 23, 2011 by Bill_H


Who the hell let all the morning people run things?
Underdog


Joined: Oct 18, 2008
Points: 332

Re: Honda HS928TCD auger shear pins - two types available
Reply #22   Jan 23, 2011 1:38 pm
Its easy for me to find unmarked metric bolts.  They are cheap too.  Based on the information outlined here I'm understanding that an unmarked metric bolt would be easier to shear than a bolt marked 8.8.   Does this logic seem misguided?  Sometimes ingorance carries a price.

Dr_Woof


Don't blow into the wind, and don't eat yellow snow. WOOF!

Location: Saskatchewan
Joined: Dec 13, 2010
Points: 253

Re: Honda HS928TCD auger shear pins - two types available
Reply #23   Jan 23, 2011 1:50 pm
Could be, misguided that is.  I have seen comments where the "unmarked" bolts are simply rejects from lots of higher grades that didn't meet specs.  If so, then they could be anything.  Dunno if this is so or not.  One would think that if it is, they would have to grind off the markings on the cap to make them unmarked,  unless they put those markings on after they make and test the bolts.  Or maybe they make the bolt stock first, test it before completing the bolt making process. and just make the stock that doesn't meet specs into unmarked bolts.

Bill_H


Location: Maine
Joined: Jan 12, 2008
Points: 354

Re: Honda HS928TCD auger shear pins - two types available
Reply #24   Jan 23, 2011 2:27 pm
Underdog wrote:
an unmarked metric bolt would be easier to shear than a bolt marked 8.8. 

Correct.

Who the hell let all the morning people run things?
Bill_H


Location: Maine
Joined: Jan 12, 2008
Points: 354

Re: Honda HS928TCD auger shear pins - two types available
Reply #25   Jan 23, 2011 2:38 pm
Dr_Woof wrote:
Could be, misguided that is.  I have seen comments where the "unmarked" bolts are simply rejects from lots of higher grades that didn't meet specs.  If so, then they could be anything.  Dunno if this is so or not.  One would think that if it is, they would have to grind off the markings on the cap to make them unmarked,  unless they put those markings on after they make and test the bolts.  Or maybe they make the bolt stock first, test it before completing the bolt making process. and just make the stock that doesn't meet specs into unmarked bolts.
Not the common hardware-store-grade ones. Not every bolt is tested, as the test itself destroys the bolt. The same logic that applies to fuses is used here, they're never tested, rather a select amount from each lot are. If a lot does not meet specs, it's usually recycled.
During the manufacture of common bolts, the markings are stamped in when the heads are formed. It's based on knowing the type of steel that is being used - and there are hundreds of types - and the heat-treating process that will be followed. This must be done before treatment while the steel is still (relatively) soft.

Who the hell let all the morning people run things?
MN_Runner


Location: St. Paul, Minnesota
Joined: Dec 5, 2010
Points: 622

Re: Honda HS928TCD auger shear pins - two types available
Reply #26   Jan 23, 2011 6:33 pm
Sorry to digress but speaking of a fuse - the thermal fuse on my Kitchenaid dishwashwer went last night - it was an easy fix once you figure out it is a fuse issue.  Dodged another bullet this week as my gas dryer was giving me a burning smell a week before.  These forums are great for narrowing down issues. 

As far as I am concerned, I don't have any issue using 8.8 Metric grade shear bolts on my Honda if I ever have to replace it or them.

rubinew


Joined: Dec 30, 2010
Points: 147

Re: Honda HS928TCD auger shear pins - two types available
Reply #27   Jan 23, 2011 8:25 pm
Dr_Woof wrote:
Not an option fpor the Honda.  But does it blow snow too?  Would be nice to listen to a little Mozart while following the Yamaha  LOL.  Comment from Mr. Rubinew??

Hmmmm, I might be more likely to listen to AC / DC !!!!
MN_Runner


Location: St. Paul, Minnesota
Joined: Dec 5, 2010
Points: 622

Re: Honda HS928TCD auger shear pins - two types available
Reply #28   Jan 23, 2011 9:10 pm
I will have my son play  "Back in Black" on his Yamaha piano.  It is an interesting thought although AD/DC's motif is consistent and so similar.
This message was modified Jan 26, 2011 by MN_Runner
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