BlackStone SG 420 B&S Stump Grinder - B&S XR2100 Engine 420cc - Cutting Disc with 8 Hammers in Tungsten Carbide

Blackstone SG 420 B & S is a lightweight and easy-to-handle device capable of cutting tree stumps and roots of 305 mm (12") underground, and of 305 mm (12") above the surface.

Safety lever and cutting disc placed in the front part, to guarantee maximum safety during working operations.

Thanks to the compact design, the machine can also be used in small spaces.

The adjustable handlebar ensures easy use and facilitates transport.

This stump grinder is the perfect product for professional gardeners or for DIY enthusiasts. Its cutting action, thanks to the disc with 8 tungsten blades, makes it easy to cut stubs and tree roots.

It is easy to use and features a powerful cutting capacity.

Tree root removal with a classic excavator causes countless damage, with the Blackstone stump grinder, instead, tree stumps are cut off cleanly, without causing damage to the property.

The roots and the base of the boots are the hardest parts to cut: the stump grinder with B&S 4-stroke engine, with a 420CC displacement and a rated power of 13.5 HP, is perfectly suitable for this kind of work.

The friction drive system designed for heavy-duty tasks makes machine starting safer and more comfortable.

Machine equipped with comfortable and practical throttle lever for the hammer.

Indispensable machine to be used whenever after cutting a plant you want to remove the remaining stump, thus being able to quickly restore the affected area.

The stump grinder mounts a powerful Briggs & Stratton XR2100 4-stroke air-cooled 420 cc engine, with overhead valves and aluminium cylinder.

Features:

Detail of the throttle lever

Detail of the air adjustment lever and the tank

Detail of the air filter

Detail of the spark plug

Nominal Power: 13.5 HP
The correct term would be "Commercial” Power, meaning the classic definition standard of power officially used until a few years ago by all leading engine manufacturers.

* This figure is even more widespread and advertised in the leading commercial channels, although it is a matter that it is higher than the actual power.

Effective power: 12.06 Hp
It corresponds to the real power expressed by the motor shaft. This is the power indicated as official in the manual or in the technical data of the motor manufacturer.

* This technical data may vary for the same engine model depending on the rotational speed supplied by the engine applied to the equipment.

The engine is PROVIDED WITHOUT OIL.
Read the instruction manual carefully before starting it.

WARNING: using the machine at maximum rpm, in addition to not obtaining an efficient grinding of the branches and not being able to grind larger diameters, it may involve a whole series of anomalies:
- lowering speed or stopping the motor during its use;
- rapid deterioration of the transmission belts between the motor and the rotor;
- damage to the centrifugal clutch which, if the motor is not at full speed, you do not get the full expansion of the same by determining the consumption of up to burn and need to be replaced;

The stump grinder is equipped with 9J type v-belt transmission with centrifugal clutch.

This feature gives high sturdiness to the unit, protecting both the engine and all the shredding system from every possible internal shock or kickback.

Higher durability over time compared to the standard system of all the manufacturers of petrol-powered machineries where the petrol engine is directly connected to the shredding cutting system.

Compared to previous models, which only had simple blades, the Blackstone stump grinder mounts real hammers on the rotor, which ensure greater durability.

The new rotor disc, consists of 4 sets of tungsten carbide hammers, for a total of 8 hammers, which can be rotated up to 3 times, to ensure the machine a longer lifespan.

The milling capacity of these hammers is larger than normal blades in terms of performance as well, thanks to the hammers being sturdier than a simple curved blade.

When one of the three parts of the hammer is worn out, simply unscrew the hammer from the rotor, and mount it turned to the second position, this way you will have a completely new hammer ready to use.

• Position 1
• Position 2
• Position 3

Its cutting action, thanks to the head with 8 hammers with tungsten carbide beating pinion, makes it easy to cut the stubs and destroy the roots.

SG 420 B&S stump grinder features a cutting depth of 305 mm (12") underground, and of 305mm (12") above the surface, which makes it a great product!

With a compact, narrow design, it can also be used in confined spaces.

The reversible teeth holders extend the machine lifespan 3 times more.

The stump grinder sets no limits on maximum cutting diameter.

Detail of the rotor lubrication system

The main controls of the stump grinder are simple and intuitive.

Equipped with a height adjusting handle, you can choose up to four handle heights, according to your preferences:

• 1
• 2
• 3
• 4

Operation handle

Safety lever: The safety lever must be held against the handle during operation. If you release the lever, the engine will stop.

Brake lever:

• 1
• 2 Pull the brake lever upwards to block machine advancement

Machine equipped with throttle lever, to adjust the rotor speed

Adjustable handle in 4 different heights.

Pneumatic wheels size 13x5.00 -6, perfect for all types of terrain and with excellent manoeuvrability.

Wheel brake of easy access for safe operation.

Detail of the cutting disc

Detail of the hammers

5.26 mm thick steel