Echo Brush Cutter and Clearing Saw Parts

Before anything else, one number: the arbor - the bore in the centre of the blade that fits over the gearcase shaft. Echo uses two, and they are not interchangeable. Get this wrong and nothing else matters, because the blade will not sit on the shaft.

The rule follows the gearcase, not the blade you want. An 8 in blade on a 20 mm arbor is the standard fit for the homeowner SRM family; the 10 in, 25 mm blades belong on the bigger clearing saws. Buying a 10 in blade because bigger sounds better, then finding the 25 mm bore will not slide onto a 20 mm shaft, is the single most common brush-cutter ordering mistake. Measure the shaft, or read the arbor off the old blade, before you buy.

The arbor sits on the output of the gearcase itself, and that gearcase is a wearing part in its own right - a shaft that runs dry inside starts to howl and can eventually strip its own teeth, blade attached or not. See the Echo gearbox and gear head page for the genuine part number and when a grease top-up is enough.

Once the arbor is settled, the blade type is a question of what you are cutting. Echo numbers them clearly, and each is built for a different density of growth:

Fewer teeth means a more aggressive, rougher cut that clears fast; more teeth means a smoother cut that lasts longer between sharpenings but slows down in the thickest growth. For a homeowner clearing an overgrown corner once or twice a year, the 3-tooth grass blade (99944200047) or the 8 in 22-tooth (99944200131) covers almost everything. The 80-tooth blades earn their keep on genuine brush that you cut regularly.

A blade is not just a matter of unscrewing the line head and bolting on steel. Running a metal blade safely on an SRM needs three things the line setup does not have, and the aftermarket sells them as a blade conversion kit - typically part numbers C535000160, C535000150 and 90051100010 for the SRM-225 family.

• A metal debris shield that replaces the plastic line guard - the plastic one is not rated to deflect what a blade throws.
• A blade adapter and locking nut that clamps the blade square to the gearcase, so it cannot slip under load.
• Often a loop or bike handle, because a blade needs two-handed control and a harness point that a light line trimmer does not require.

Not every SRM should swing a blade. The 21.2 cc SRM-225 and SRM-230 handle a grass or light brush blade fine; asking one to spin a big 80-tooth blade through dense wood all day overloads the clutch and the small engine. If you are converting the 225 specifically, cross-check the gearcase and shaft details on the SRM-225 parts page first - the conversion is only worth doing if the fitment is right.

Converting a light SRM is not the only route to a brushcutter. Echo also builds one factory, the commercial loop-handle SRM-410U, which ships with its own gearbox and a Walbro carburetor rather than any kit bolted onto a trimmer boom - the better option for daily commercial use rather than occasional brush clearing.

Brush blades are one category where the aftermarket is genuinely competitive - a stamped or carbide-tipped disc is simple to make well, and multi-packs cost a fraction of a single genuine blade. Carbide-tipped compatible blades in particular hold an edge longer than plain steel. What you give up is consistency of balance: a poorly-balanced cheap blade vibrates, and vibration on a blade is far more punishing than on a line head.

Whatever you fit, three rules keep a blade safe. Always run the metal shield, never the plastic line guard. Always torque the blade nut properly - a blade that works loose is dangerous, not just annoying. And respect blade thrust: the top-right quadrant of a spinning blade grabs and kicks if it touches something solid, which is why two-handed control and the right harness matter. If your machine is still set up for line and you only want a cleaner grass cut rather than brush clearing, you are better off staying with line - which line and which diameter is covered on the Echo trimmer line page.

A brush blade is only one way a PAS power head earns its keep beyond trimming line. The same engine also swaps onto a hedge trimmer boom - see the Echo hedge trimmer attachment parts page for the two hedge attachments Echo sells and which one suits which hedge.

A brush blade is not the only Echo attachment that lives or dies by a simple wear part - the PAS edger runs on a blade of its own, and it is worth knowing the genuine number from the universal cross-reference before you order one. See the Echo edger blade page for both.

The same PAS power head also runs two attachments this page does not cover: the Echo tiller/cultivator attachment for working soil in beds, and the Echo pole saw attachment for pruning branches without a ladder - both are covered in full on their own pages.

For clearing up after the cutting is done rather than doing more cutting, the same coupler also takes a power broom attachment - a bristle head for sweeping clippings off driveways and walks rather than a blade for cutting growth.