Product Specification

Gemin

Silenced Box-Type HB20G Hydraulic Breaker: The Ultimate High-Performance Solution for 20-Ton Excavators

In the demanding world of heavy-duty demolition and quarrying, the hb20g hydraulic breaker has long been recognized as a benchmark for reliability and power. For B2B buyers, fleet managers, and contractors, finding a partner that delivers original-brand quality with enhanced innovation is the key to maximizing ROI.

At Guchuan Machinery (SEWOOMIC), we have taken the proven architecture of the Japanese Furukawa HB20G and refined it into our HB20G series. Since 2010, our Changzhou-based factory has combined over a decade of manufacturing expertise with cutting-edge R&D to solve common industry pa-in points, such as oil leakage and internal wear.

1. Understanding the HB20G Silenced Box-Type Technology

The HB20G hydraulic breaker is specifically designed for the 18–25 ton excavator class—the "workhorse" range for global infrastructure. The "Silenced Box-Type" (also known as the "Whisper" or "Enclosed" type) housing provides two critical benefits:

• Noise Reduction: By fully enclosing the hammer body in a bracket lined with sound-dampening materials, it is ideal for urban construction hydraulic rock hammer applications where strict noise regulations apply.

• Component Protection: The box structure shields the main cylinder and mining hydraulic breaker parts from dust, debris, and external impact, significantly extending the service life of the tool.

2. Technical Specifications: SEWOOMIC HB20G (HB20G Equivalent)

Our HB20G is engineered to perfectly match and exceed the performance metrics of the Furukawa HB20G, ensuring 100% compatibility with your existing fleet.

Suitable Excavator:18–22 Tons
Operating Weight:1700–1800 Kgs
Total Length:≈2700–2800 mm
Required Oil Flow:100–150 L/min
Setting Pressure:210 Bar
Operating Pressure:160–180 Bar
Back Head Nitrogen Pressure:14–17 Bar
Accumulator Pressure:55–60 Bar
Impact Rate:350–500 Bpm
Impact Energy:≈4000–4500 Joule
Hose Diameter:1 Inch
Tool Diameter:135 MM
Chisel Length:1200–1300 mm
Noise Level:Low Noise / Silenced Type

3. The Science of Power: Nitrogen Gas-Assisted Principles

The HB20G operates on a sophisticated nitrogen gas-assisted impact principle. Unlike pure hydraulic systems, this design uses a nitrogen chamber at the top of the piston.

1. Energy Accumulation: As the piston moves upward, hydraulic oil compresses the nitrogen gas.

2. Maximum Impact: When the valve triggers the downward stroke, the expansion of the nitrogen gas adds massive velocity to the piston, resulting in superior breaking force.

3. Recoil Absorption: The gas chamber also acts as a shock absorber, protecting the excavator’s boom from the destructive vibrations common in heavy demolition.

4. Engineering Excellence: 20CrMo and Precision Grinding

What sets Guchuan Machinery apart is our commitment to material science. The HB20G is a 20crmo excavator rock breaker.

• Advanced Metallurgy: We use high-grade 20CrMo alloy steel for all critical mining hydraulic breaker parts, including the piston and cylinder.

• Japanese Precision: Utilizing our Japanese Taiyo Koki vertical grinders, we achieve micron-level tolerances. This precision ensures a perfect fit between the piston and cylinder, minimizing internal friction and heat—the primary enemies of hydraulic seals.

5. Innovations in R&D: Solving the Oil Leak Problem

Many original designs in the industry suffer from legacy flaws that lead to oil leakage under high-pressure conditions. SEWOOMIC’s R&D department has actively improved the seal housing architecture:

• Optimized Seal Design: We have redesigned the seal grooves to accommodate multi-stage, high-temperature resistant seal kits.

• Structural Improvements: By correcting defects found in the original product blueprints, we have successfully reduced the frequency of oil leaks by over 30% in high-duty cycles.

6. Application Scenarios: From Urban Roads to Hard Rock Mines

The versatility of the hb20g hydraulic breaker makes it suitable for:

• Urban Construction: Road maintenance and foundation demolition where low noise is mandatory.

• Mining & Quarrying: Primary and secondary breaking of granite, limestone, and basalt.

• Infrastructure: Tunneling, trenching, and bridge demolition.

7. Why Partner with Guchuan Machinery (SEWOOMIC)?

As a specialized B2B exporter since 2010, we offer more than just a product; we provide a competitive advantage.

• Global Compatibility: Our GCB, GH B, and NB series are interchangeable with brands like Soosan, MSB, and Atlas Copco.

• Ultra-Heavy Duty Capacity: Beyond the 135mm HB20G, we manufacture massive breakers for 195mm to 210mm chisel diameters.

• Quality vs. Value: We provide Tier-1 quality at a factory-direct price point, maximizing your ROI.

8. Conclusion: The Smart Choice for 20-Ton Carriers

If you are looking for a silenced box-type HB20G that combines Japanese precision with Chinese manufacturing efficiency, the SEWOOMIC HB20G is the industry expert’s choice. We don't just build breakers; we engineer reliability.