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China Good quality 87kg Hydraulic Grab Attachment Mini Excavator Thumb Cylinder for Engineering Construction Machinery with Good quality

Product Description

Product Photos


The Dredge Bucket Clamp, also referred to as a Thumb Clamp, combines the functionality of a hydraulic grapple and a dugout bucket. This unique combination makes it particularly effective for gripping smaller timber, rods, and bars. It is well-suited for various applications including municipal construction, secondary demolition, mining, and other demanding operating environments.

Main Parameters


Excavator Thumb
Model Number GBB20 GBB30 GBB50 GBB60 GBB120 GBB200 GBB300
Weights(Kg) 87 131 304 424 864 1419 1943
Maximum Opening(mm) 697 810 1211 1141 1570 2085 2200
Overall Dimensions(mm) 520*400*522 648*440*586 879*600*850 1031*650*978 1263*860*1190 1520*960*1447 1345*1060*1516



Desigh Highlights

1,Multi-purpose machine: particularly well-suited for the crushing and recycling of construction concrete, as well as mountain road construction. It offers excellent flexibility and a cost advantage.

2,Its capability to securely grip objects in any orientation makes it exceptionally efficient for tasks such as wood picking and material sorting.

3,The structural design is thoughtfully executed, resulting in a robust load-bearing capacity.

4,With its user-friendly design, this machine offers versatility for a variety of tasks, making it convenient and efficient for multiple purposes.

Customer Visiting

1,The crane’s safety features and easy-to-use control system make it possible for the operator to get started quickly, and it also ensures the safety of the operation process through system testing and operator training.

2,The materials and components used in the crane are of very good quality, durable and suitable for a wide range of applications, and can be used in my construction, road construction, mining operations, I really like the CHINAMFG crane

3,The crane price is relatively low and the maintenance cost is also cheaper, which is an economical choice. CHINAMFG manufacturer provides excellent after-sales service, including maintenance, training, etc., which makes me feel very satisfied.

4,”I recently used this crane for a construction project, and I couldn’t be happier with its performance. The crane was delivered on time and in great condition, and the operator was very professional and knowledgeable. The crane itself was powerful yet precise, making it easy to lift and place heavy loads exactly where we needed them. The safety features were also impressive, ensuring that all operations were carried out safely and efficiently. Overall, I highly recommend this crane to anyone in need of reliable and efficient lifting equipment.”

Packaging & Shipping

Accessories for Cranes

Company Profile

HangZhou CHINAMFG Construction Machinery Co.,Ltd.is located at the base of engineer construction machinery–HangZhou. The main categories are SQ1-SQ25 series truck mounted cranes with knuckle boom & telescopic boom. In addition to the main products above, CHINAMFG also provides crane-related products like pickup cranes ,marine cranes,forklift cranes and timber cranes…

BOB-LIFT has firstly obtained the national truck mounted crane “type test” manufacturing license and passed the ISO9001 quality system certification. CHINAMFG leads the industry development trend, and promotes the healthy & sustainable development of the industry.

HangZhou CHINAMFG Construction Machinery Co., Ltd., formerly known as ZheJiang Lift Truck Crane Joint-Stock Co., Ltd., established in February 2004 and situated in 1 of the biggest construction machinery manufacturing bases – HangZhou City,is a private hi-tech enterprise specialized in producing truck mounted cranes integrating the design, manufacture and sales.

The company covers an area of 37,000-plus square meters. The top-seller products of the company are SQ1-SQ25 series truck cranes with knuckle boom and telescopic boom. In addition to the main products above, Lift also provides other crane-related products like track cranes and marine cranes.Bearing the enterprise spirit of honesty, reliability, innovation, cooperation, CHINAMFG has stipulated strict quality system requirements in every managing link, such as design, purchasing, manufacturing, testing and service.

Our company has obtained national truck mounted crane type Test manufacturing license, and passed GB/T19001-2008/ISO9001:2008 quality management system certificates. Besides, the company undertakes deep technical exchange and cooperation with Italy and Sweden crane manufacturers, which makes us obtain CE certificate very early in the industry.

Bob-Lift always treats Customer Satisfaction as the only standard to evaluate the quality and service, and sets “Leading product, Super value service” as development strategy. That is the best proof of CHINAMFG willingness to be a faithful collaborator of customers in realizing profitable growth and mutual prosperity!

Introduction to the Factory

We offer a wide selection of CHINAMFG loader cranes with broad variation in range and lifting capacity.

Strict quality control system, passed ISO quality management system and CE certification.

We cooperate with professional logistics companies to provide efficient cargo transportation by sea, air and land.

1 year warranty and perfect customer after sale service service standards.

*Product advantages:

1.Hexagon boom structure strengthens the loading capacity.

2.Float type triple bridge design applies in the crane pedestal, making the force arrangement of the chassis more scientific.

3.Plate type valves and locks reduced the linking points, and the pipe system becomes more simple. The leaking points have been reduced and the sealing function has been improved.

4.Four bar linkage mechanism has been applied in the joint parts, which improves the working capacity at the maximum elevating angle.

5.Cushion valve has been installed on the slewing cylinder, which completely solved the damages to the crane due to crane impacts.

6.Flange plate balance valve and compulsory sequence valve make the movement more accurate and reliable.

7.Over winding protection device adopts wireless control, protecting the user’s safety efficiently.

8.The inner cable mechanism enables the simplicity of the outlook.

9.Synchronous telescopic mechanism shortens the boom extending time and improves the work efficiency.


1) How many years of your factory?

We have 20 years production and nearly 10 years experience, we exported to more than 120 countries & regions.

2) Which kind of payment you can be accepted?

Normally both of T/T & L/C at sight are ok for us.

3) How about the delivery time?

7-40 working days after received 30% T/T or L/C.

4) What’s your warranty?

Normally is 1 year, if large quantities we can negotiate.

5) What’s your MOQ?

MOQ: 1 set

6) Can you accept OEM service?

Yes for sure my friend.

7) Optional Attachment?

Remote Control, Basket, Auger, Grapple, Top Seat, Rear Legs

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After-sales Service: Long-Term Local After-Sales Service
Warranty: Remote Technical Support ,1 Year After-Sales Servi
Type: Excavator Bucket
US$ 4300/Piece
1 Piece(Min.Order)


Order Sample

Custom colors, packed by plastic film


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Shipping Cost:

Estimated freight per unit.

about shipping cost and estimated delivery time.
Payment Method:


Initial Payment

Full Payment
Currency: US$
Return&refunds: You can apply for a refund up to 30 days after receipt of the products.

hydraulic cylinder

How do hydraulic cylinders compare to other methods of force generation like electric motors?

Hydraulic cylinders and electric motors are two different methods of force generation with distinct characteristics and applications. While both hydraulic cylinders and electric motors can generate force, they differ in terms of their working principles, performance attributes, and suitability for specific applications. Here’s a detailed comparison of hydraulic cylinders and electric motors:

1. Working Principle:

– Hydraulic Cylinders: Hydraulic cylinders generate force through the conversion of fluid pressure into linear motion. They consist of a cylinder barrel, piston, piston rod, and hydraulic fluid. When pressurized hydraulic fluid enters the cylinder, it pushes against the piston, causing the piston rod to extend or retract, thereby generating linear force.

– Electric Motors: Electric motors generate force through the conversion of electrical energy into rotational motion. They consist of a stator, rotor, and electromagnetic field. When an electrical current is applied to the motor’s windings, it creates a magnetic field that interacts with the rotor, causing it to rotate and generate torque.

2. Force and Power:

– Hydraulic Cylinders: Hydraulic cylinders are known for their high force capabilities. They can generate substantial linear forces, making them suitable for heavy-duty applications that require lifting, pushing, or pulling large loads. Hydraulic systems can provide high force output even at low speeds, allowing for precise control over force application. However, hydraulic systems typically operate at lower speeds compared to electric motors.

– Electric Motors: Electric motors excel in providing high rotational speeds and are commonly used for applications that require rapid motion. While electric motors can generate significant torque, they tend to have lower force output compared to hydraulic cylinders. Electric motors are suitable for applications that involve continuous rotary motion, such as driving conveyor belts, rotating machinery, or powering vehicles.

3. Control and Precision:

– Hydraulic Cylinders: Hydraulic systems offer excellent control over force, speed, and positioning. By regulating the flow of hydraulic fluid, the force and speed of hydraulic cylinders can be precisely controlled. Hydraulic systems can provide gradual acceleration and deceleration, allowing for smooth and precise movements. This level of control makes hydraulic cylinders well-suited for applications that require precise positioning, such as in industrial automation or construction equipment.

– Electric Motors: Electric motors also offer precise control over speed and positioning. Through motor control techniques such as varying voltage, frequency, or pulse width modulation (PWM), the rotational speed and position of electric motors can be accurately controlled. Electric motors are commonly used in applications that require precise speed control, such as robotics, CNC machines, or servo systems.

4. Efficiency and Energy Consumption:

– Hydraulic Cylinders: Hydraulic systems can be highly efficient, especially when properly sized and designed. However, hydraulic systems typically have higher energy losses due to factors such as fluid leakage, friction, and heat generation. The overall efficiency of a hydraulic system depends on the design, component selection, and maintenance practices. Hydraulic systems require a hydraulic power unit to pressurize the hydraulic fluid, which consumes additional energy.

– Electric Motors: Electric motors can have high efficiency, especially when operated at their optimal operating conditions. Electric motors have lower energy losses compared to hydraulic systems, primarily due to the absence of fluid leakage and lower friction losses. The overall efficiency of an electric motor depends on factors such as motor design, load conditions, and control techniques. Electric motors require an electrical power source, and their energy consumption depends on the motor’s power rating and the duration of operation.

5. Environmental Considerations:

– Hydraulic Cylinders: Hydraulic systems typically use hydraulic fluids that can pose environmental concerns if they leak or are not properly disposed of. The choice of hydraulic fluid can impact factors such as biodegradability, toxicity, and potential environmental hazards. Proper maintenance and leak prevention practices are essential to minimize the environmental impact of hydraulic systems.

– Electric Motors: Electric motors are generally considered more environmentally friendly since they do not require hydraulic fluids. However, the environmental impact of electric motors depends on the source of electricity used to power them. When powered by renewable energy sources, such as solar or wind, electric motors can offer a greener solution compared to hydraulic systems.

6. Application Suitability:

– Hydraulic Cylinders: Hydraulic cylinders are commonly used in applications that require high force output, precise control, and durability. They are widely employed in industries such as construction, manufacturing, mining, and aerospace. Hydraulic systems are well-suited for heavy-duty applications, such as lifting heavy objects, operating heavy machinery, or controlling large-scale movements.

– Electric Motors: Electric motors are widely used in various industries and applications that require rotational motion, speed control, and precise positioning. They are commonly found in appliances, transportation, robotics, HVAC systems, and automation. Electric motorsare suitable for applications that involve continuous rotary motion, such as driving conveyor belts, rotating machinery, or powering vehicles.In summary, hydraulic cylinders and electric motors have different working principles, force capabilities, control characteristics, efficiency levels, and application suitability. Hydraulic cylinders excel in providing high force output, precise control, and durability, making them ideal for heavy-duty applications. Electric motors, on the other hand, offer high rotational speeds, precise speed control, and are commonly used for applications that involve continuous rotary motion. The choice between hydraulic cylinders and electric motors depends on the specific requirements of the application, including the type of motion, force output, control precision, and environmental considerations.

hydraulic cylinder

How do hydraulic cylinders contribute to the efficiency of agricultural tasks like plowing?

Hydraulic cylinders play a crucial role in improving the efficiency of agricultural tasks, including plowing. These cylinders provide several benefits that enhance the performance and productivity of agricultural machinery. Let’s explore how hydraulic cylinders contribute to the efficiency of plowing and other agricultural tasks:

  1. Powerful Force Generation: Hydraulic cylinders are capable of generating high forces, which is essential for tasks like plowing. The hydraulic system supplies pressurized fluid to the cylinders, converting hydraulic energy into mechanical force. This force is then utilized to drive plow blades through the soil, overcoming resistance and facilitating efficient soil penetration. The power generated by hydraulic cylinders ensures effective plowing, even in tough or compacted soil conditions.
  2. Adjustable Working Depth: Hydraulic cylinders allow for easy and precise adjustment of the plow’s working depth. By controlling the extension or retraction of the hydraulic cylinder, farmers can adjust the depth of the plow blades according to soil conditions, crop requirements, or their specific preferences. This adjustability enhances efficiency by ensuring optimal soil tillage and minimizing unnecessary energy expenditure. Farmers can adapt the plowing depth to different field areas, optimizing the use of resources and promoting uniform crop growth.
  3. Responsive Control: Hydraulic systems offer highly responsive control, enabling farmers to make quick adjustments during plowing operations. Hydraulic cylinders respond rapidly to changes in hydraulic pressure and valve settings, allowing for immediate modifications in the plow’s position, depth, or angle. This responsiveness enhances efficiency by facilitating on-the-go adjustments based on soil variations, obstacles, or changing field conditions. Farmers can maintain precise control over the plow’s performance, ensuring effective soil tillage and minimizing the risk of crop damage.
  4. Implement Versatility: Hydraulic cylinders enable the attachment of various implements to agricultural machinery, expanding their functionality and versatility. In the context of plowing, hydraulic cylinders allow for the attachment and detachment of plow blades or other tillage implements. This versatility enables farmers to adapt their equipment to different soil types, field sizes, or specific plowing requirements. By using hydraulic cylinders, farmers can easily switch between different implements, optimizing their equipment for specific tasks and maximizing efficiency.
  5. Efficient Time Management: Hydraulic cylinders contribute to time efficiency in agricultural tasks like plowing. With hydraulic systems, farmers can operate plows at higher speeds while maintaining control and precision. The responsive nature of hydraulic cylinders allows for efficient turning, maneuvering, and repositioning of plows, minimizing downtime and optimizing field coverage. This time efficiency translates into increased productivity and reduced overall operational costs. Farmers can accomplish plowing tasks more quickly, allowing them to cover larger field areas in less time.

In summary, hydraulic cylinders significantly contribute to the efficiency of agricultural tasks like plowing. Through powerful force generation, adjustable working depth, responsive control, implement versatility, and efficient time management, hydraulic systems equipped with cylinders enhance the performance and productivity of agricultural machinery. These contributions allow farmers to accomplish plowing tasks more effectively, optimize field operations, and achieve improved overall efficiency in their agricultural practices.

hydraulic cylinder

How do hydraulic cylinders accommodate variations in stroke length and force requirements?

Hydraulic cylinders are designed to accommodate variations in stroke length and force requirements, providing flexibility and adaptability for different applications. They can be tailored to meet specific needs by considering factors such as piston diameter, rod diameter, hydraulic pressure, and cylinder design. Here’s a detailed explanation of how hydraulic cylinders accommodate variations in stroke length and force requirements:

1. Cylinder Size and Design:

– Hydraulic cylinders come in various sizes and designs to accommodate different stroke lengths and force requirements. The cylinder’s diameter, piston area, and rod diameter are key factors that determine the force output. Larger cylinder diameters and piston areas can generate greater force, while smaller diameters are suitable for applications requiring lower force. By selecting the appropriate cylinder size and design, stroke lengths and force requirements can be effectively accommodated.

2. Piston and Rod Configurations:

– Hydraulic cylinders can be designed with different piston and rod configurations to accommodate variations in stroke length. Single-acting cylinders have a single piston and can provide a stroke in one direction. Double-acting cylinders have a piston on both sides, allowing for strokes in both directions. Telescopic cylinders consist of multiple stages that can extend and retract, providing a longer stroke length compared to standard cylinders. By selecting the appropriate piston and rod configuration, the desired stroke length can be achieved.

3. Hydraulic Pressure and Flow:

– The hydraulic pressure and flow rate supplied to the cylinder play a crucial role in accommodating variations in force requirements. Increasing the hydraulic pressure increases the force output of the cylinder, enabling it to handle higher force requirements. By adjusting the pressure and flow rate through hydraulic valves and pumps, the force output can be controlled and matched to the specific requirements of the application.

4. Customization and Tailoring:

– Hydraulic cylinders can be customized and tailored to meet specific stroke length and force requirements. Manufacturers offer a wide range of cylinder sizes, stroke lengths, and force capacities to choose from. Additionally, custom-designed cylinders can be manufactured to suit unique applications with specific stroke length and force demands. By working closely with hydraulic cylinder manufacturers, it is possible to obtain cylinders that precisely match the required stroke length and force requirements.

5. Multiple Cylinders and Synchronization:

– In applications that require high force or longer stroke lengths, multiple hydraulic cylinders can be used in combination. By synchronizing the movement of multiple cylinders through the hydraulic system, the stroke length and force output can be effectively increased. Synchronization can be achieved using mechanical linkages, electronic controls, or hydraulic circuitry, ensuring coordinated movement and force distribution across the cylinders.

6. Load-Sensing and Pressure Control:

– Hydraulic systems can incorporate load-sensing and pressure control mechanisms to accommodate variations in force requirements. Load-sensing systems monitor the load demand and adjust the hydraulic pressure accordingly, ensuring that the cylinder delivers the required force without exerting excessive force. Pressure control valves regulate the pressure within the hydraulic system, allowing for precise control and adjustment of the force output based on the application’s needs.

7. Safety Considerations:

– When accommodating variations in stroke length and force requirements, it is essential to consider safety factors. Hydraulic cylinders should be selected and designed with an appropriate safety margin to handle unexpected loads or variations in operating conditions. Safety mechanisms such as overload protection valves and pressure relief valves can be incorporated to prevent damage or failure in situations where the force limits are exceeded.

By considering factors such as cylinder size and design, piston and rod configurations, hydraulic pressure and flow, customization options, synchronization, load-sensing, pressure control, and safety considerations, hydraulic cylinders can effectively accommodate variations in stroke length and force requirements. This flexibility allows hydraulic cylinders to be tailored to meet the specific demands of a wide range of applications, ensuring optimal performance and efficiency.

China Good quality 87kg Hydraulic Grab Attachment Mini Excavator Thumb Cylinder for Engineering Construction Machinery   with Good quality China Good quality 87kg Hydraulic Grab Attachment Mini Excavator Thumb Cylinder for Engineering Construction Machinery   with Good quality
editor by CX 2024-02-28