Bucket Arm Cylinder
Product description:

A bucket arm cylinder, also known as a stick cylinder or dipper arm cylinder, is a critical hydraulic component in excavators, backhoes, cranes, and other heavy-duty construction machinery. It is responsible for controlling the movement of the excavator arm — the link between the boom and the bucket — allowing the operator to extend, retract, and position the bucket precisely during digging, loading, and grading operations.

hydraulic cylinders are actuators that convert hydraulic energy into linear mechanical force. They have a compact structure, high output force, and smooth operation. They are the core components for performing actions such as pushing, pulling, lifting, and pressing in various mechanical and industrial systems, and are widely used in construction machinery, metallurgy, mining, shipping, and other fields.

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Structure and Working Principle

The bucket arm cylinder consists of several essential components: cylinder barrel, piston rod, piston, sealing system, guide bushings, and end caps. When hydraulic fluid is pumped into the cylinder, the pressure pushes the piston forward, extending or retracting the rod. This movement controls the arm’s rotation angle, enabling the bucket to dig deeper or move material more efficiently.

Designed for high-pressure and high-load applications, the cylinder’s structure ensures smooth motion, precise positioning, and reliable performance even under the harshest working environments.

Materials and Manufacturing Process

To ensure durability and performance, the cylinder barrel is made from high-strength alloy steel and precision honed to achieve a smooth internal surface, reducing friction and seal wear. The piston rod is chrome plated or treated with advanced coatings such as QPQ or nickel-chrome plating to improve corrosion resistance and surface hardness.

Modern manufacturing techniques such as CNC machining, automated welding, induction hardening, and heat treatment guarantee tight dimensional tolerances and structural integrity. Each component is meticulously inspected before assembly to ensure flawless performance and long service life.

Key Features and Advantages

• High Working Pressure: Designed to operate under pressures up to 35 MPa or more, ensuring strong output force and high efficiency.
• Superior Sealing System: Equipped with high-performance seals from trusted brands (e.g., NOK, Hallite, Parker) to prevent internal leakage and contamination.
• Exceptional Durability: Precision-machined parts, hard surface coatings, and optimized materials ensure long-lasting reliability.
• Custom Design Options: Available in multiple bore sizes, stroke lengths, and mounting configurations to fit different excavator models and applications.
• Smooth and Stable Motion: Advanced hydraulic design ensures steady speed control and minimal vibration during operation.
• Easy Maintenance: The cylinder features replaceable seals and wear parts for convenient maintenance and reduced downtime.

Working principle of hydraulic cylinder:

Applications:

The hydraulic cylinder is an energy conversion device that converts hydraulic energy into mechanical energy. It is the core executive component in the hydraulic system. The hydraulic cylinder uses hydraulic oil to drive the piston to move, converting hydraulic energy into linear reciprocating motion. When the hydraulic oil enters the cylinder barrel, it pushes the piston rod to extend or retract, completing the predetermined action. The direction and speed of its movement are regulated by the hydraulic control system. The hydraulic cylinder consists of a cylinder barrel, cylinder cover, piston and piston rod, sealing device, and buffering device. According to its structure, it can be classified as piston type, plunger type, multi-stage telescopic sleeve type, and gear rack type. Hydraulic cylinders are widely used in machine tools, construction machinery, vehicles, and other fields, featuring a simple structure and smooth movement.

The bucket arm cylinder is primarily used in:

• Excavators and backhoe loaders to control the arm’s extension and retraction during digging and loading.
• Cranes and material handlers to manage boom articulation and movement.
• Mining and quarry equipment for efficient earthmoving and material transfer.
• Agricultural and forestry machinery where strong, precise hydraulic movement is essential.
• In all these applications, the bucket arm cylinder ensures consistent force, stable control, and maximum operational efficiency.

Quality Control and Testing

• Every cylinder undergoes strict inspection and hydraulic testing before delivery. Quality assurance includes:
• Hydraulic Pressure and leakage testing under rated loads
• Dimensional accuracy verification
• Coating adhesion and corrosion resistance testing
• Fatigue and endurance testing for long-term reliability
• All products comply with ISO, DIN, and CE standards, guaranteeing consistent performance and safety in demanding industrial environments.

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Why us?

We focus on the research, development, production and sales of seamless steel pipes, special-shaped steel pipes and hydraulic cylinders. We have a complete production chain and an advanced equipment system, including piercing machines, cold drawing machines, hot rolling machines, high-precision flaw detection and testing equipment. The company has passed multiple authoritative certifications such as ISO9001, API, SGS, CCS, DNV, ABS, CE, RoHS, etc., ensuring that each product complies with international standards. We are committed to providing customers with high-quality, customizable solutions to meet diverse application needs.

Relying on our own built processing base and modern workshops, combined with multiple branches and storage centers across the country, we have achieved sufficient inventory and efficient logistics coordination, significantly shortening the delivery cycle and ensuring the rapid delivery of orders.

We have established a complete service and support system. After the order is signed, the professional after-sales team can provide timely and safe on-site guidance and technical support to ensure that customers are at ease throughout the process from procurement to use.

FAQ:

1. Do you support customized design and production?

Sure. We have a professional engineering team that can conduct customized design and production with special sizes, control systems or OEM according to your requirements.

2. How fast can you deliver?

In stock sizes, it takes 3-5 days. For customized sizes, it takes 30-35 days.

3. What payment methods do you support?

We support TT payment. Generally, 30% to 50% of the payment is made in advance, and the remaining amount is paid before shipment.

4. Can you provide material certification (MTC)?

Yes, we will provide MTC to you after production is completed to ensure that the material quality meets the standards.

5. What is the minimum order quantity?

Generally, we accept trial orders. The minimum order quantity is 1-3 tons, which can be determined according to different products.