1. Project Background & Case Study Overview
Urban demolition and heavy infrastructure projects face two major hurdles: strict municipal noise control and high production demands on tough materials.During a recent urban commercial expansion project, a regional contractor needed to break down over 5,000 CBM of reinforced concrete foundations surrounded by residential buildings. Local regulations capped operating noise levels at strict thresholds, making standard open-frame breakers unviable. To tackle this challenge without sacrificing impact power, the engineering team deployed the SB121 Box-Type Silent Hydraulic Breaker fitted on a 30-ton carrier.
2. Product Description & Overview
The Jinan Changhao SB121 is a high-performance, heavy-duty box-type silent hydraulic breaker designed specifically for 27-33 ton excavators. Engineered with a fully enclosed box structure and shock-absorbing polyurethane damping elements, the SB121 significantly cuts down operational decibels while dampening recoil energy transmitted to the excavator boom.
Manufactured with high-grade alloy steel and precision-machined internal components, the SB121 delivers hitting power for rock breaking, quarrying, mining, and heavy concrete demolition.
Universal Compatibility: A Perfect Match for Your Excavator
Our SB121 box type hydraulic breakers are engineered to integrate seamlessly with 27-33 ton excavators,including CAT330, Komatsu PC300, Volvo EC300, Hitachi ZX300, SY335 and other large excavator models.
The “Three Golden Parameters”: Precision Fitment Guaranteed
To ensure a “Ready-to-Work” experience and avoid installation delays, we strictly verify the Three Golden Parameters before shipping:
Pin Diameter: Precision-machined to match your excavator’s bucket pins (e.g., 90mm, 100mm, 110mm).
Pin Spread (Center-to-Center): Ensures the breaker sits at the correct geometry for maximum breakout force.
Ear Width (Inner Width): A precise fit to the excavator’s dipper arm to eliminate lateral movement and prevent wear on your arm bushings.
“We don’t just sell a breaker; we sell a customized solution that fits your machine perfectly on the first try.”
3. Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | SB121 Box Type |
| Carrier | 27–33 ton |
| Weight | 2741 kg |
| Oil Flow | 180–240 L/min |
| Working Pressure | 200–220 bar |
| Frequency | 200–300 bpm |
| Chisel Dia. | 155 mm |
| Hose Size | 1 1/4 inch |
4. Primary Selling Points & Engineering Advantages
Noise Reduction & Environmental Compliance
The fully enclosed box-type housing shields the main breaker body from dust and impacts while dampening acoustic output to meet strict urban environmental regulations.
Hydraulic Efficiency & Reduced Carrier Fatigue
Featuring an optimized internal valve design and hydraulic circuit, the SB121 maximizes energy conversion efficiency. This minimizes oil heat generation and reduces hydraulic pump wear on the host machine.
High Impact Energy (Gas-Oil Hybrid Power)
Equipped with a high-pressure nitrogen gas chamber combined with hydraulic pressure, the system boosts hitting force with every cycle while absorbing piston recoil.
Premium Alloy Construction & Thermal Treatment
Both the 155 mm chisel and piston are forged from nickel-vanadium alloy steel and undergo proprietary heat treatment to prevent premature fracturing or excessive wear under high heat.
5. Applications
The Jinan Changhao SB121 hydraulic breaker is built to handle heavy-duty applications:
Demolition & Urban Construction: Breaking reinforced concrete foundations, bridge piers, road surfaces, and building structures.
Mining & Quarrying: Secondary rock breaking, benching, and mesh crushing in open-pit mines.
Infrastructure & Trenching: Tunnel excavation, utility line trenching, and frozen ground breaking.
6. Case Performance & Client Feedback
During the 30-day field deployment, the SB121 hydraulic breaker maintained continuous operation without unscheduled maintenance stop-outs.
“The Jinan Changhao SB121 delivered the hitting force of an open breaker with the sound control required for working near residential zones. Fuel consumption remained low, and our operator reported far less cabin vibration compared to previous attachments.”
— Project Site Manager
7. Ready to Upgrade Your Fleet?
Jinan Changhao provides hydraulic breaker hammers, piping kits, spare parts,and excavator attachments compatible with major excavator brands (CAT, Komatsu, Volvo, Hyundai, Doosan, SANY, Hitachi).
Contact the Jinan Changhao engineering team today to request a quote or spec sheet for the SB121 hydraulic breaker.