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Good morning folks,

Can someone, or multiple ones... Can you tell me about the Tricut blades and the mulch fans?

I remember the mulch fan being sold at our shop. Well, offered at our shop, I am not remembering them flying out the door. Dad explained that it gets the grass clippings somehow circulating under the deck so they are chopped up finer before they are discharged.

The TriCut blades I vaguely remember something through the fog. Were these mounted as three stacked blades atop one another? Does anyone or everyone still do this?
This does not seem logical, but what do I know?

I have these questions after looking around at the old IPC (illustrated parts catalog) and reading in the maintenance manual. In 1974 I guess my 8232 came with the single blade and the support bracket (blade stiffner) that applied spring pressure to the blade when the nut was torqued properly with the washer underneath. Somewhere in the 1983's "a new tricut blade with built in stiffener replaces all blades on the 19", 12", and 21" mowers manufactured from 1959 through 1982".

OK, I get that, they are recommending a new blade in 1983 for all the old models too. Then: "The new blade eliminates the use of the stiffener and washer. The collar is still required."

Then there is an illustration showing the three tricut blades and a single BBC blade. BBC= blade brake clutch. Then it says "Only one tricut blade is used on the blade brake clutch model mowers" The distance between outside holes is greater and will not fit other models with the collar."

Thus my confusion over the stacked blades, but I still cannot see in my minds eye, three stacked blades beating blades of grass into submission being a real engineering breakthrough. Sometimes I wish a had a crystal for a navel. This way when I have my head so fur up my rear end, I can still look out and see where I am going.

Then there is the fan... Does this four blade thing mount with the blade also or does it replace the blade?
Does it turn my LawnBoy into a hovercraft like the FlyMow? What ever happened to the FlyMow?:laughing:

I had a 93 4.75 mulching silver series push mower that I bought new. It had the mulching fan. Using that for 15 years I never had a thatch issue. Long story short the 93 was ran without oil so I bought a used dura force and installed a short block. The Dura force has the mulching plug in but did not have the fan on the blade, just a regular LB 21 inch. I mowed without the fan. The deck clogged up around the edges and would spit chunks of grass out. I installed the fan off of the 93 and issue was fixed for mulching. The engineer who came up with that did a lot of home work.

tri cut blade I am not award of. I know Honda uses dual blades. I would think they may work, but you can find LB mulching fans for 15.00 or less and a mulching plug for probably the same if you want to turn your old LB into a mulcher.

I also have a M-series that has a square deck that is very deep compared to the standard staggered wheel deck. It uses the same lb blade as the dura force and does the same job mulching.

fabricgator said:

Good morning folks,

Can someone, or multiple ones... Can you tell me about the Tricut blades and the mulch fans?

I remember the mulch fan being sold at our shop. Well, offered at our shop, I am not remembering them flying out the door. Dad explained that it gets the grass clippings somehow circulating under the deck so they are chopped up finer before they are discharged.

The TriCut blades I vaguely remember something through the fog. Were these mounted as three stacked blades atop one another? Does anyone or everyone still do this?
This does not seem logical, but what do I know?

I have these questions after looking around at the old IPC (illustrated parts catalog) and reading in the maintenance manual. In 1974 I guess my 8232 came with the single blade and the support bracket (blade stiffner) that applied spring pressure to the blade when the nut was torqued properly with the washer underneath. Somewhere in the 1983's "a new tricut blade with built in stiffener replaces all blades on the 19", 12", and 21" mowers manufactured from 1959 through 1982".

OK, I get that, they are recommending a new blade in 1983 for all the old models too. Then: "The new blade eliminates the use of the stiffener and washer. The collar is still required."

Then there is an illustration showing the three tricut blades and a single BBC blade. BBC= blade brake clutch. Then it says "Only one tricut blade is used on the blade brake clutch model mowers" The distance between outside holes is greater and will not fit other models with the collar."

Thus my confusion over the stacked blades, but I still cannot see in my minds eye, three stacked blades beating blades of grass into submission being a real engineering breakthrough. Sometimes I wish a had a crystal for a navel. This way when I have my head so fur up my rear end, I can still look out and see where I am going.

Then there is the fan... Does this four blade thing mount with the blade also or does it replace the blade?
Does it turn my LawnBoy into a hovercraft like the FlyMow? What ever happened to the FlyMow?:laughing:

Click to expand...

http://www.partstree.com/parts/lawn...998-sn-8900001-8999999/engine-blade-assembly/

You need the collar (#2) and a recessed blade I would guess, probably have the same blade. Also need to block off chute with mulching plug.

Tri-cut refers to a style of single-blade. Not a stack of blades. The only "stack" is if you use the single blade with a mulching fan. The mulching fan came as standard on "V" series and DuraForce models. You could mow without it installed if you were going to side-discharge. (As I prefer to do). The "newer" style of LawnBoy blades were made stiffer, thus eliminating a few parts such as the "blade stiffener" and a couple of washers.

Thanks Guys, great info from this forum!