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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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jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 524

Re: Honda HS928TCD auger shear pins - two types available
Reply #41   Jan 2, 2013 8:28 am
nvestr wrote:
Thanks - Just still not sure if that "pin" needs to be a stronger steel than the actual shear bolt (#13)?

I would say it does need to be stronger but...
There really isn't any way to know if the Pin has a higher shear strength than the Shear bolt.
I say that because there is a different amount of torque or shearing action being applied
to the Pin and the Shear bolt. The Shear bolt is further out from the center axis of the auger shaft
so it is actually spinning faster than the Pin.  There is also more leverage involved working on shearing the Bolt.
I obviously don't know all the engineering involved here.
Only that it appears that Honda designed the shearing action to take place.
 at the #13 bolt. I believe.
Don't know why Honda doesn't label the #13 bolt as a "Shear bolt" (if that is what it is and was designed to be)
rather than just a "Bolt, Hex. (6x16)"
The most important issue here is making sure that you have the correct Harness or Grade bolt.
It's the only thing that really matters.  Gear boxes run about $500.00 complete. 
And the Shafts alone are about $100.00

You can by the nuts at any Ace Hardware store and possibly the correct Grade bolts as well.




aa335


Joined: Nov 29, 2008
Points: 2391

Re: Honda HS928TCD auger shear pins - two types available
Reply #42   Jan 2, 2013 11:01 am
One thing to note is that Honda shear bolts are sensitive to overtorque.  It will stretch the bolt and cause premature shearing.  I've done this and was about to get stronger shear bolts so I don't have to replace them so often.  Don't do this.  The shear bolt is held on by a Nyloc type nut.  This prevents the nut from spinning off the bolt.    Just tighten the nut until it is snug up against the plastic block, no more than that.

I don't know of aftermarket shear bolts are made to the same specs as the Honda original parts, they might be.  I just want don't want to experiment and risk an expensive gearbox.  I don't break shear bolts as often now so cost isn't an issue, and when I do break one, it is because I went over something hard, and the shear bolts function as it should. 
This message was modified Jan 2, 2013 by aa335
MN_Runner


Location: St. Paul, Minnesota
Joined: Dec 5, 2010
Points: 617

Re: Honda HS928TCD auger shear pins - two types available
Reply #43   Jan 2, 2013 7:40 pm
I totally agree with AA335. You just can't be "penny wise and pound foolish".  Why take a chance on $5 bolt and damage $500 auger.
jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 524

Re: Honda HS928TCD auger shear pins - two types available
Reply #44   Jan 2, 2013 11:20 pm
aa335 wrote:
One thing to note is that Honda shear bolts are sensitive to overtorque.  It will stretch the bolt and cause premature shearing.  I've done this and was about to get stronger shear bolts so I don't have to replace them so often.  Don't do this.  The shear bolt is held on by a Nyloc type nut.  This prevents the nut from spinning off the bolt.    Just tighten the nut until it is snug up against the plastic block, no more than that.
I agree.  The nuts only function on a Shear Bolt, is to keep the bolt it place.
Buy the bolts from Honda and if you want to save some money.
Buy the metric Nyloc Flange nuts from a Hardware store.
If they don't carry Nyloc Flange nuts. Just by some Nyloc nuts and a washer.
nvestr


Joined: Jan 1, 2013
Points: 3

Re: Honda HS928TCD auger shear pins - two types available
Reply #45   Jan 3, 2013 10:41 am
Thanks everyone! Great discussion. My #13 shear bolts are 8.8 Metric shear bolts, same size as the Honda OE's. My local Honda dealer doesn't even sell the Honda ones - They sell a generic bolt of the same size labeled CH 8.8 I think. I have ordered the #9 pins from Honda at $7 each. In the interim I will use an 8.8 bolt if any snow falls down before I get them. Thanks for the help!
This message was modified Jan 3, 2013 by nvestr
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 #46   Jan 3, 2013 2:43 pm
jrtrebor wrote:
I would say it does need to be stronger but...
There really isn't any way to know if the Pin has a higher shear strength than the Shear bolt.
I say that because there is a different amount of torque or shearing action being applied
to the Pin and the Shear bolt. The Shear bolt is further out from the center axis of the auger shaft
so it is actually spinning faster than the Pin.  There is also more leverage involved working on shearing the Bolt.
I obviously don't know all the engineering involved here.
Only that it appears that Honda designed the shearing action to take place.
 at the #13 bolt. I believe.
Don't know why Honda doesn't label the #13 bolt as a "Shear bolt" (if that is what it is and was designed to be)
rather than just a "Bolt, Hex. (6x16)"
The most important issue here is making sure that you have the correct Harness or Grade bolt.
It's the only thing that really matters.  Gear boxes run about $500.00 complete. 
And the Shafts alone are about $100.00

You can by the nuts at any Ace Hardware store and possibly the correct Grade bolts as well.





So what exactly is the function of the pins, as opposed to the shear bolts?  Is it just a secondary protection in case the shear bolt doesnt work?  Or what?  7 bux for a pin sounds really excessive.

aa335


Joined: Nov 29, 2008
Points: 2391

Re: Honda HS928TCD auger shear pins - two types available
Reply #47   Jan 3, 2013 2:54 pm
MN_Runner wrote:
I totally agree with AA335. You just can't be "penny wise and pound foolish".  Why take a chance on $5 bolt and damage $500 auger.

Just to clarify, I don't like spending $5 for a $0.25 bolt any more than anyone else.  However, since I don't snap these bolts that often, I'm not putting my snowblower at risk by trying out other cheaper alternatives that may or may not work as designed.

If I live in Lake Tahoe and witnessed someone used an off the shelf bolt on their Honda snowblower and it sheared as designed, I'll be convinced to use the same.  
aa335


Joined: Nov 29, 2008
Points: 2391

Re: Honda HS928TCD auger shear pins - two types available
Reply #48   Jan 3, 2013 2:58 pm
jrtrebor wrote:

If they don't carry Nyloc Flange nuts. Just by some Nyloc nuts and a washer.

Are there Nyloc flange nuts?  I've never seen one.  I've seen flange nuts with serrations though.

Good tip on the nylock nut and washer.  I would get the flat washer instead of the split lockwasher.  These are cheaper than a rare nylock flange nuts, which you can't find to reuse after the shear bolts have been broken.
This message was modified Jan 3, 2013 by aa335
jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 524

Re: Honda HS928TCD auger shear pins - two types available
Reply #49   Jan 3, 2013 4:45 pm
aa335 wrote:
Are there Nyloc flange nuts?  I've never seen one.  I've seen flange nuts with serrations though.

They do make them, but they aren't common.
Your right most flange nut have the serrations.
If they do have them, they are called Flange Whiz nuts.
I'm not sure a  regular Flange Whiz nut will work well in this application.   If it's not a Nyloc nut as well.
With the surface that the nut is butting up against being curved.
The Whiz nut may not have enough surface area to bite well enough
to keep it from vibrating loose.
So I guess a washer and a regular Nyloc nut would be best.
Whoha


Location: Minneapolis
Joined: Nov 5, 2011
Points: 35

Re: Honda HS928TCD auger shear pins - two types available
Reply #50   Sep 20, 2014 9:29 am
So no one has has brought up the A-2 70 stainless bolt option yet anywhere on the internet that I have found. An A-2 70 stainless is 12 % weaker then then the same 8.8 bolt. This may make some of you who don't seem to want to try the 8.8 vs the OEM Honda bolts. I have not tied these yet. But I have a couple for this up coming winter for my 2011 928.  If you find some stainless A4-80 they a just a hair under 8.8. I bought my A2 70s at Menard's.




http://home.jtan.com/~joe/KIAT/kiat_2.htm

http://www.volksbolts.com/faq/basics.htm

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This message was modified Sep 20, 2014 by Whoha
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