The SB121 top type is a heavy-duty hydraulic breaker designed specifically for the 27–33 ton class of excavators, making it a perfect match for your excavator CAT330, Komatsu PC300, Sany SY305,Volvo EC290, EC300D/E, Doosan DX300LC,Hyundai R290LC, R300LC, XCMG XE300.
The SB121 is favored for large-scale mining and heavy demolition due to its high impact energy and “Power Cell” protection.
| Model Type | SB121 |
| Weight | 2780KG |
| Length | 2776mm |
| Working Pressure | 200-220 kg/cm² |
| Oil Flow | 180-240 L/min |
| Impact Rate | 200-300 bpm |
| Oil hose dia. | 1 1/4 inch |
| Chisel Dia. | 155mm |
| Chisel | 42CrMo forging, Each chisel has undergone 3 cold heattreatments, long life chisel |
| Excavator | 27-33 Ton |
| warranty | 12 months |
Core Features of the Top TYPE SB121
High-Strength Material: The main body hydraulic cylinder is forged from 20CrMo high-alloy steel, processed via vacuum heat treatment for maximum hardness and durability.
Stabilized Structure: Through-bolts (made of 42CrMo)are reinforced to maintain internal pressure and alignment during high-frequency impact.
Unlike the box-enclosed model, the Top Type SB121 is defined by its exposed frame and vertical orientation:
Superior Heat Dissipation: The open-frame design allows air to circulate directly around the cylinder and backhead. This is a critical feature for high-ambient temperature regions in South America (e.g., Northern Chile or Brazil), preventing seal failure during long shifts.
Extended Working Range: The vertical alignment provides a longer reach and better visibility for the operator when working in deep trenches or foundations.
Easy Maintenance Access: Every through-bolt, nut, and hydraulic fitting is directly accessible. You don’t need to remove a housing to inspect the internal components, reducing downtime for routine maintenance.
Straight Impact Force: The design focuses the striking energy directly downward. This makes it highly efficient for primary breaking in open-pit quarries where noise suppression is less of a concern than pure production speed.
155mm Chisel Diameter: The Gold Standard for 30-Ton Heavy Duty Breakers
In the demanding construction environments of South America—from the hard basalt quarries of Paraguay to the urban infrastructure projects in Chile—equipment durability determines profitability. For operators using 27–33 ton class excavators, the SB121 Hydraulic Breaker stands out, primarily due to its industry-leading 155mm chisel diameter.
Why the 155mm Diameter Matters
The diameter of the chisel is the single most important factor in determining the destructive force delivered to the rock surface. A 155mm tool provides a significantly larger cross-sectional area compared to standard 140mm tools, allowing for:
Enhanced Kinetic Energy Transfer: Delivering over 5.0kJ of impact energy without compromising the tool’s structural integrity.
Reduced Piston Wear: The precise match between the 155mm chisel and the internal power cell ensures optimal alignment, reducing internal friction and heat.
Superior Service Life: Forged from 20CrMo alloy steel and subjected to rigorous vacuum heat treatment, these 155mm tools are built to resist the extreme stresses of “Dry Firing” and side-loading.
Optimized for 30-Ton Class Carriers
The SB121 is the perfect “Plug & Play” attachment for mainstream 30-ton excavators, including the Caterpillar 330, Sany SY305, and Volvo EC300. By prioritizing the 155mm parameter in your equipment selection, you ensure that your breaker isn’t just an attachment, but a heavy-duty power house capable of handling 24/7 quarrying operations.
Key Technical Advantages
Quarrying Advantage: In hard rock mines, the Top Type is often preferred over the Silenced type because the “bounce back” (recoil) is more directly handled by the excavator’s heavy-duty arm, and the open design survives the abrasive dust of a quarry better than a closed box that can trap debris.
Versatile Tool Options: Choose from Moil, Wedge, or Blunt chisel types to suit specific geological conditions like volcanic rock or reinforced concrete.
Full-Set Configuration: Every SB121 arrives ready for deployment with a comprehensive spare parts kit, including two 155mm chisels and nitrogen charging tools.
Technical Tip: Always verify the “Golden Parameters” (Pin diameter, Center distance, and Ear width) to ensure a perfect “Plug & Play” fit with your specific excavator model (e.g., Sany SY305 or CAT 330).