Guchuan SB121 / GCB320 Hydraulic Breaker Rock Breaker 155mm Chisel Box Type for 28-35 Ton Excavators

Meta Description:​ Discover Guchuan's SB121/GCB320 silent-type hydraulic hammer. Designed for 28-35 ton excavators, it delivers 6779J impact energy with low 123 dB noise. Get OEM quality at a competitive price.

Guchuan SB121 / GCB320 Silent-Type Hydraulic Breaker – Power Meets Precision and Quiet Operation

SB121 / GCB320 Silent-Type Hydraulic Breaker.This breaker is engineered for contractors who will not compromise on power, efficiency, or environmental compliance. It represents the pinnacle of our in-house R&D capabilities, combining immense impact force with significantly reduced noise levels.

Who is the SB121 / GCB320 For? Primary Applications

This breaker is the ideal attachment for large-scale projects requiring high productivity with minimal environmental disruption. Its primary applications include:

· ••Heavy Demolition:​ Breaking down thick reinforced concrete structures, foundations, and bridges.

· ••Quarry & Mining:​ Secondary rock breaking, oversize reduction, and trenching in hard rock.

· ••Urban Construction:​ Projects in noise-sensitive areas like hospitals, schools, and residential zones, where strict noise regulations apply.

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Unpacking the "Silent-Type" Advantage: Technology and Design

The term "silent-type" can be misleading—it doesn't mean silent,but rather significantly quieter than conventional breakers. The GCB320 achieves its low 123 dB noise level​ through several key design features:

1.Advanced Casing Design:​ The external housing incorporates internal dampening materials and is engineered to contain and absorb sound waves generated during the piston's impact cycle, preventing them from radiating outward.

2.Optimized Impact Mechanism:​ Our proprietary hydraulic circuit design ensures a smoother, more efficient transfer of energy, reducing metal-on-metal vibration and the high-frequency noise associated with it.

3.Precision-Matched Components:​ Tolerances between the piston, cylinder, and tool are held to exacting standards, minimizing play and the resultant clatter during operation.

This focus on noise reduction isn't just about compliance; it's about operator comfort, reduced community complaints, and the ability to work longer hours in restricted areas.

Core Technology: Pure Hydraulic System with Auto-Frequency Conversion

What truly sets Guchuan breakers apart is our self-developed Auto-Frequency Conversion technology​ within a 100% pure hydraulic system. Unlike simpler systems, our technology intelligently adjusts the impact rate based on the hardness of the material.

· ••When striking hard, unyielding concrete,​ the system automatically lowers the BPM (Blows Per Minute) to maintain maximum energy per blow (6779 Joules), preventing a "blank fire" and ensuring efficient fracture propagation.

· ••When working on softer or already fractured material,​ it increases the BPM for faster material breakup.

This smart system maximizes efficiency, reduces unnecessary hydraulic oil overheating, and decreases stress on the breaker and the carrier, leading to exceptional durability and lower total operating costs.

Why Choose the Guchuan SB121 / GCB320? Your Competitive Edge

1.Proven Interchangeability:​ The SB121 / GCB320 is designed as a direct equivalent to leading Korean and Japanese models. This ensures easy mounting and compatibility with your 28-35 ton excavator, minimizing downtime.

2.OEM-Level Quality, Optimized Price:​ We manufacture critical components in-house under strict quality control. You receive the same performance and reliability as top-tier brands, but at a more competitive price point, offering a superior return on investment.

3.Built for Durability:​ With an operating weight of nearly 2900 kg and built from high-strength, wear-resistant steels, the GCB320 is constructed to withstand the rigors of continuous heavy-duty use.

4.Expert Support:​ When you partner with Guchuan, you get more than a product. You gain a partner with over a decade of expertise in B2B cross-border trade, offering professional technical support and reliable after-sales service.

Conclusion

The Guchuan SB121 / GCB320 Silent-Type Breaker is more than just a tool; it's a productivity solution engineered for the modern contractor. It delivers the brute force needed for the toughest jobs while respecting the growing demands for quieter, more sustainable operations.Ready to experience the Guchuan difference?​ Explore our full range of hydraulic hammers, from compact to super-heavy-duty models like our 400mm tool diameter breakers.

[Contact our team today] for a quotation and expert advice on the perfect breaker for your application.

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