Honda HS720 issues and vs. Toro 721 - Snowblower Forum : Snow Blower Forums
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post #1 of 13 Old 10-29-2014, 02:46 PM Thread Starter
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Honda HS720 issues and vs. Toro 721

Hi.
New here but looking for some input.

I was set on buying a Toro 721 QZR snowblower this fall. Then I saw the Honda HS720AA about 5 weeks ago and ended up confused which to buy.

After owning Honda cars and currently owning a Honda HRX217 lawnmower I had decided I'd go with the Honda. There is a dealership I pass that sells both Honda & Toro. However, when I went into a dealership pretty much 90% sure I was buying the HS720 the dealer said they were having issues with vibration on them. That they vibrated so badly he called Honda and Honda said they know its an issue and for now the corrective action is to loosen the handle bolts up a bit. This fix seems oddly very "unHonda" like to me.

Has anyone else ran across this or heard about it ? I'm surprised to hear a Honda product getting to market with this type issue. Certainly factory testing would have addressed this I'd think.

Also, He said even if the Honda HS720 was vibration free, the Toro 721 does a better job at pulling itself through the snow and I'd be happier with it. That the Honda needs to be pushed more basically and the Toro will be itself across a bare driveway even. I had no idea they were that different. Thoughts on this also?

Thanks
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post #2 of 13 Old 10-29-2014, 05:35 PM
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Mark-up on Hondas is very small compared to the other brands. I wouldn't be surprised if the sales person is giving you his ""word of advice""

Post this question in the HOnda forum: Honda Snowblowers - Snowblower Forum : Snow Blower Forums
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post #3 of 13 Old 10-29-2014, 08:20 PM
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I'm sure "Robert from Honda" will chime in, but something just doesn't sound right with what that dealer told you. With the money spent on engineering and advanced testing, I can't believe a company like Honda would introduce a piece of equipment to the market with "vibration problems" and issue a dealer service bulletin to "loosen the handle bars as a temporary fix." Just sounds a little far fetched. Wonder if the dealer is on some kind of sales incentive program and is steering you towards the Toro. FYI. Both the Honda HS720 and the Toro 721 are very good machines. There's another thread comparing both machines about 10 or 15 threads down. You really can't go wrong either way. Good Luck!

2009 Honda HS928WAS
2005 Honda HS520AS
1996 Honda HS621AS
2012 Toro 1800 Power-Curve
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post #4 of 13 Old 10-29-2014, 09:44 PM
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Yeah, if anything, they are usually known for heir relative smoothness.

Garage:
MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.
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post #5 of 13 Old 10-30-2014, 10:38 AM
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I heard the same from local power equipment honda dealer about vibration issue on HS720CC ( canadian light commercial with GS190 engine), which is basically the same as 2015 720AM in US (less the engine GC vs GS). Apparently it is due to increased speed of the auger (claiming to throw 55 metric tons per hour).
I ended up finding a deal on new HS520 and went with 520 instead. They made them unchanged for 10 years or more then it must be good enough design.

Honda trying to match Toro 721 specs, but auger design is not holding up to higher speed and power. Vibrations are coming from rubber (where unsupported by steel auger) hitting the ground flat due to increased speed according to honda salesman causing vibrations..

He had no HS520 in stock, so it is not like he tried to sell out old stock first to me, but he said if I can find 520 it would be better, so I did.
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post #6 of 13 Old 10-30-2014, 11:38 AM
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Over-tightening the 8mm handlebar nuts will indeed cause excessive vibration to the handlebar. Dealers have been advised to use a torque wrench set to 52 in-lbs when tightening the nut, and bingo, no vibration:


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post #7 of 13 Old 10-30-2014, 08:19 PM
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Thank you for the tech tip Robert. I will try to use 52 in-lb on my HS520 handlebar bolts.
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post #8 of 13 Old 10-31-2014, 12:41 AM
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I am curious what the tightness of the bolts has to do with the amount of vibration that is passed from the lower arms to the upper arms of the blower.

Does tightening them too tight cause the two bars to become more like one long bar and thus change the resonance frequency of the total bar to one that in concert with the engine causes the vibration? An interesting engineering question.

BMR
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post #9 of 13 Old 10-31-2014, 10:33 AM
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Quote:
Originally Posted by BMR View Post
I am curious what the tightness of the bolts has to do with the amount of vibration that is passed from the lower arms to the upper arms of the blower.

Does tightening them too tight cause the two bars to become more like one long bar and thus change the resonance frequency of the total bar to one that in concert with the engine causes the vibration? An interesting engineering question.

BMR
While I am not a mechanical engineer, those here at Honda who are tell me having the correct torque makes a difference on the measurable vibration felt by the operator at he handlebars.

Any countermeasure(s) besides the exact torque specification would not be implemented until production of these models resumes next summer. Watch this space for updates.

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post #10 of 13 Old 11-25-2014, 04:41 PM
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Smile Honda HS720 issues and vs. Toro 721

Maybe Honda is implementing a new vibration fix now and that is why online sites report "this product is on hold from Honda due to manufacturing issues".
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