Mulchers for Mini-Excavators

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Frequently Asked Questions About Brown Bronto Mulcher For Your Mini-Excavator.

Why a cutting edge style tooth for your mulcher?
There are three styles of teeth you can use:  Flail (swinging hammer), Cutting Edge, Carbide. The flail style tooth is fine for small brush but anything larger is just does not cut well.  That particular knife design was intended to kick back when you hit something hard.  In a larger tree, that kick back means loss of power.  That same kick back or “give” in that design on a larger tree also means it is now cutting at an angle it was never designed to cut at. The carbide tooth design is fine for stump grinding (low rpm and high torque) as it just grinds.  It doesn’t cut.  So in trees it performs fairly well, but in brush (since it doesn’t cut) it just makes a mess and throws the small material around.

Chain deflector vs Belt deflector – what is the difference?
The chain deflector comes standard on all our Raptor mower heads.  It is strong and will withstand just about anything and does an excellent job keeping large material from going out the back farther than it should.  These chains are on a guard that is bolted on and easily replaced.  The belt deflector is superior on deflection but there is no give on it when back swinging on a stump and you can potentially tear it off.  Advantage to the belt guard is that it can act as a “squeegie” on the brush allowing you to pile it up and then just mow and mulch the pile of brush.

Can you mulch up a pile of brush?
Yes!  While you’re always best clearing a tree while it is standing in place, you can easily clear up ground brush and pre-piled brush.

How much can you clear in a day?
Machines this size are usually capable of 1 1/2 to 2 acres a day.

Is the mower head sturdy?
Absolutely!  The shell is made out of Hardox which resists to flexing and is as strong as twice as thick mild steel.  Everyone’s first impression is how heavy duty our small mower heads are built.  No corners are cut in building these mulching heads.

What are the RPM speeds?

We spin our heads around 1400 to 1600 RPM.

But XXXX’s mower head spins much faster, why is that?
Most likely because the tooth design does not perform well at lower speeds for cutting.  The higher the RPM, the lower the torque.  It also means the longer you need to wait for your head to get back up to speed before being able to cut again.  Neither one of those is a good thing. Your machine has a fixed amount of horse power.  That horse power creates RPM and Torque, so as RPM goes up, your torque goes down.
The calculation for Torque =  HP x 5252 / RPM
So a 60 HP excavator spinning one of our heads at 1500 RPM will create 210 foot pounds of torque.  Now if I took that same head and spun it up to 3000 rpm, that same head will now only create 105 foot pounds of torque.

Are your bearings fixed or floating?
They are both.  The bearing design we use can easily be changed from a held bearing to a floating bearing by simply moving a twist lock.

What do you mean by “modular design”?
Our heads were designed from the ground up to be interchangeable.  This way someone with a 10,000 lb excavator – who one day purchases a 22,000 lb excavator can use the same head by easily changing out the excavator attachment points and also changing out the hydraulic motor to match up with the new excavator.

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