Soundguy said:
Wow... I find that kinda 'backwards'. It's been my observation that rubber shields deflect more dust and ALL the thrown particles from under a hog.. where chains deflect -most- of the bigger particles, and none of the dust.
Our local county finally just switched over to rubber shileds after getting sued multiple times in the past years for thrown debri from roadside mowers.. both county and contractors. Contractors are now required to have the rubber shields on the mowers when doing county ROW work.
I notice some of the bush hog and JD mowers in the 15 size range are coming out with rubber shields as standard now.
Just an observation. ( 2 of my 5 mowers have rubber shields )
Soundguy
Most brands offer rubber or metal plate as "standard" on economy mowers, and sell chains gaurds as an option. Bush Hog list's a 9 ga. metal gaurd as standard, and recommends them in ag applications only rather than no guards at all, on light duty mowers, but NOT on their heavy duty lines. They offer no rubber gaurds as factory equipment. You can't buy a Bush Hog medium duty mower WITHOUT chains on the front, no matter what the use anymore. (Oddly enough, you CAN buy them without ANY rear gaurds.) My son just bought a Bush Hog 2615 "Legend" 15' batwing It was available ONLY with chains. Rhino's heavy duty mowers come standard with 5/16" chain guards ONLY, no option for no gaurds OR rubber.
The insurance agent showed me where 33 states currently spec CHAINS ONLY as guards in their qualifications on mowing equipment when bidding on state/interstate hi-way mowing jobs. Rubber guards are listed in the insurers specs as OBSOLETE and not allowed on mowers they cover in commercial applications. Same applies to the metal plate gaurds. They list them as insurable on AGRICULTURAL USE ONLY applications where no shields are "required" in the first place.
When shopping for my latest mower (just a year ago) I found mention in sales literature from Bush Hog, John Deere, Rhino, Woods, Shulte, and Brown where no guards are required in ag use, but some gaurds were installed from the factory and they recommended leaving them intact, rather than no gaurds at all.
Currently I have 3 mowers along with 2 belonging to my son that we'll use when mowing commercially this coming season. All 5 are equipped with the required chains. We havn't seen any indication that anything beyond that is needed. (Only "dust issue" is with one particular Woods mower that seems to throw more debris forward than rearward.)
Bush Hog sales rep suggested to me that the theory is to allow flying debris to be deflected downward and slowed, deadening the momentum, allowing the projectile to exit front or rear in a controlled manner, but not TRAPPED UNDER the mower where it would continue to be thrown about by the mower blades, increasing the chances of the object going in an "unplanned direction or possibly causing a blade to break, then it would have the opportunity to fly through someones windshield. (as would be the case with rubber or sheet metal gaurds.) He also brought up this point. Which would you expect to stop a projectile moving at the speed of a bullit? 5/16" METAL or 1/4" rubber? Apparently those folks who build and must be held liable for these mowers, along with the insurance companies who share in that liability feel the same way.
I can't account for one lone county's acceptance of what major insurance underwriters, manufacturers of the mowers, and all the bigger mowing contractors seem to find not acceptable in commercial use.
In the end, I believe I'll stick with the findings of the manufacturers and insurers who've had to battle those lawsuits. I'd bet they have more than enough hard evidence to back up their findings. I'm inclined to follow along with the findings of names like Bush Hog, Woods, Alamo Group (Rhino/Alamo/Shulte SUPER heavy duty mowers) and believe in the risk analysis studies done by names like Prudential Ins, Mutual of Omaha, Business Mens Assurance, The Hartford Group, State Farm ins, and Farm Bureau Ins rather than the casual observations of one man with less than a lifetimes worth of experience. But that's just me, your results may vary.