The Ultimate Guide to the High-Performance Back Head for Guchuan SB/GCB Series Nitrogen Breakers

Understanding the Critical Role: What is a Breaker Back Head?

In the powerful world of hydraulic breakers, the back head (or rear head/back cover) is far more than a simple end cap. It is the pressurized chamber that houses the critical nitrogen gas charge and forms the rear boundary for the piston’s reciprocating motion. Acting as both a seal and an energy accumulator, it is fundamental to the breaker’s "gas spring" principle, which converts hydraulic energy into powerful, efficient impact force.

For operators and fleet managers, a failing back head is a primary cause of downtime. Issues like nitrogen leakage, seal failure, or structural fatigue lead directly to:

• Loss of Impact Power: Reduced gas pressure fails to properly return the piston, diminishing strike energy.

• Hydraulic System Contamination: Failed seals allow nitrogen and contaminants to mix with hydraulic oil.

• Catastrophic Failure: A cracked or blown back head results in immediate, total breaker failure and potential safety hazards.

Guchuan Back Head: Engineered for Excellence in SB121, SB131, SB151 Breakers

Our back head is not a generic replacement part; it is a precision-engineered component designed from the ground up for compatibility and supreme performance with Guchuan's SB/GCB 320, 350, and 400 class breakers. It is the result of our proprietary Auto-Frequency Modulation and Pure Hydraulic Technology, ensuring it meets the exact operational specifications of these powerful models.

Core Product Features & Technical Specifications:

• Precision Compatibility: Engineered to OEM-fit specifications for Guchuan models: SB121 (GCB320), SB131 (GCB350), SB151 (GCB400). Guarantees perfect alignment, bolt pattern match, and seal interface.

• Ultra-High-Strength Forged Steel Construction: Manufactured from premium-grade, heat-treated alloy steel forgings, providing exceptional tensile strength and resistance to metal fatigue under constant high-pressure cycling.

• Advanced Sealing Architecture: Utilizes a multi-stage sealing system featuring:

  • High-pressure, wear-resistant Polyurethane (PU) or HNBR main seals.

  • Precision-machined sealing grooves for optimal seal seating and longevity.

  • Secondary wiper seals to prevent external contamination ingress.

• Precision-Machined Charging Valve Port: Incorporates a reliable, high-flow Schrader-type or ball-valve charging port for safe, efficient, and leak-free nitrogen charging and pressure monitoring.

• Robust Nitrile Diaphragm (Accumulator Bladder): A high-elasticity, tear-resistant bladder that cleanly separates the nitrogen gas from the hydraulic oil, ensuring consistent gas spring performance and preventing oil emulsification.

• • In-House R&D & Manufacturing: Complete control over the entire production process, from metallurgy to final assembly, ensuring unwavering quality.

  • Pure Hydraulic Expertise: Our breakers and parts are designed around efficient, pure hydraulic principles, not modified from pneumatic designs.

  • Direct B2B Partnership: We work directly with distributors, large fleet owners, and OEM partners, providing technical support, customization options, and competitive pricing.

  • • In-House R&D & Manufacturing: Complete control over the entire production process, from metallurgy to final assembly, ensuring unwavering quality.

    • Pure Hydraulic Expertise: Our breakers and parts are designed around efficient, pure hydraulic principles, not modified from pneumatic designs.

    • Direct B2B Partnership: We work directly with distributors, large fleet owners, and OEM partners, providing technical support, customization options, and competitive pricing.

    • • In-House R&D & Manufacturing: Complete control over the entire production process, from metallurgy to final assembly, ensuring unwavering quality.

      • Pure Hydraulic Expertise: Our breakers and parts are designed around efficient, pure hydraulic principles, not modified from pneumatic designs.

      • Direct B2B Partnership: We work directly with distributors, large fleet owners, and OEM partners, providing technical support, customization options, and competitive pricing.

      • Commitment to Innovation: Our investment in technologies like auto-frequency modulation drives the industry forward, and this innovation is embedded in every component we make.

        Commitment to Innovation: Our investment in technologies like auto-frequency modulation drives the industry forward, and this innovation is embedded in every component we make.

        Commitment to Innovation: Our investment in technologies like auto-frequency modulation drives the industry forward, and this innovation is embedded in every component we make.

        Anti-Corrosion & Surface Treatment: Undergoes processes like phosphatization or specialized coating to resist rust and corrosion, extending service life in harsh environments.

        

        The Technology & Principle: How the Guchuan Back Head Optimizes Performance

        The breaker's impact cycle is a symphony of hydraulics and gas pressure. The back head is the conductor.

        1. Energy Accumulation (Piston Return Stroke): After impact, high-pressure hydraulic oil enters the rear chamber, pushing the piston back. The nitrogen in the back head is compressed, absorbing and storing this energy.

        2. Energy Release (Power Stroke): The hydraulic direction reverses. The compressed nitrogen expands rapidly, acting as a powerful spring to accelerate the piston forward with tremendous kinetic energy towards the tool (chisel).

        3. The Guchuan Advantage: Our self-developed automatic frequency modulation technology, integrated into the breaker's design, allows the tool to optimize its blow frequency based on material hardness. The back head’s consistent pressure retention and robust design are crucial for this system to function reliably, ensuring high efficiency whether breaking soft concrete or hard granite.

        Key Product Advantages & Customer Benefits

        Choosing the Guchuan OEM Back Head translates into tangible operational and financial benefits:

        • Restores & Maintains OEM Performance: Guarantees your breaker operates with the original power, speed, and efficiency specified by Guchuan engineers.

        • Maximizes Uptime & Reduces Downtime: Engineered for durability to prevent unscheduled failures, keeping your equipment on the job and profitable.

        • Superior Sealing & Pressure Retention: Our advanced seal technology and machining precision minimize nitrogen leakage, ensuring consistent impact force over longer periods and reducing gas recharge frequency.

        • Protects Your Hydraulic System: By maintaining a perfect seal between gas and oil, it prevents costly contamination and damage to the breaker’s hydraulic circuitry and the carrier’s main hydraulic system.

        • Enhanced Safety: The high-integrity construction eliminates the risk of sudden, catastrophic failure, protecting both operators and machinery.

        • Cost-Effective Lifecycle Value: While competitively priced, its extended service life and prevention of secondary damage offer a lower total cost of ownership compared to inferior aftermarket parts.

        • Direct OEM Fitment: Saves valuable workshop time with easy, no-modification installation.

        Target Applications & Use Cases

        The Guchuan SB121/131/151 breakers and their corresponding back heads are built for heavy-duty demolition and fragmentation tasks:

        • Primary & Secondary Rock Breaking in quarries and mines.

        • Demolition of Heavy Concrete Structures (foundations, bridges, pillars).

        • Trench Rock Excavation for pipeline and utility installation.

        • Boulder Splitting and oversized material reduction.

        • Mining & Tunneling applications.

        Why Source from Guchuan Machinery?

        As the original manufacturer, we offer what no intermediary can:

        • In-House R&D & Manufacturing: Complete control over the entire production process, from metallurgy to final assembly, ensuring unwavering quality.

        • Pure Hydraulic Expertise: Our breakers and parts are designed around efficient, pure hydraulic principles, not modified from pneumatic designs.

        • Direct B2B Partnership: We work directly with distributors, large fleet owners, and OEM partners, providing technical support, customization options, and competitive pricing.

        • Commitment to Innovation: Our investment in technologies like auto-frequency modulation drives the industry forward, and this innovation is embedded in every component we make.

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          Company Profile

          Jiangsu Guchuan Machinery Co., Ltd. is a leading manufacturer based in Changzhou, Jiangsu Province, China. Established in 2010, our company occupies over 18,000 square meters and employs more than 120 skilled professionals. We specialize in the research, development, manufacturing, sales, and service of hydraulic breaker hammers and other Construction Attachments, offering comprehensive solutions for the construction and demolition industries.