Analysis of Core Components of Doosan Excavator: Selection and Maintenance of Hydraulic System and Transmission Components

Doosan excavators are renowned in the field of engineering construction for their reliable performance and efficient productivity. In order to maintain its good working condition and extend its service life, it is crucial to understand, select correctly, and maintain the core components, especially the hydraulic system and transmission parts, on a daily basis. This article will provide in-depth analysis of these two systems, offering professional purchasing advice and practical maintenance techniques.

1、 Hydraulic system: the power source of Doosan excavator

The hydraulic system is the "heart" of the excavator, responsible for converting the mechanical energy of the engine into hydraulic energy, providing powerful power for the working device. The hydraulic system of a Doosan excavator typically consists of the following key components:

Hydraulic pump: the core component that converts mechanical energy into hydraulic energy. The commonly used hydraulic pump types for Doosan excavators include gear pumps, vane pumps, and plunger pumps. Different types of hydraulic pumps have different performance characteristics, such as plunger pumps that can provide higher pressure and flow, making them suitable for high-power excavators.

Hydraulic control valve: used to control the flow direction, pressure, and flow rate of hydraulic oil, thereby achieving precise control of various actions. The hydraulic control valve group of Doosan excavator usually integrates multiple control valves, including main safety valve, secondary relief valve, boom valve, boom valve, bucket valve, rotary valve, and walking valve.

Hydraulic cylinder: an actuator that converts hydraulic energy into mechanical energy, used to drive boom, arm, bucket, and walking devices. The hydraulic cylinder of Doosan excavator is designed with different cylinder diameters and strokes according to different work requirements.

Hydraulic oil: The working medium of hydraulic systems, responsible for transmitting pressure and lubricating components. Doosan excavators recommend using hydraulic oil that meets their specifications to ensure the normal operation of the system and extend the lifespan of components.

Purchase suggestion:

Choose legitimate channels: When purchasing hydraulic system accessories, you should choose authorized dealers or legitimate component suppliers from Doosan to ensure the quality and reliability of the accessories.

Reference technical parameters: Select the matching hydraulic pump, control valve, and hydraulic cylinder based on the model and technical specifications of the excavator. For example, different models of excavators may require hydraulic pumps with different displacements.

Pay attention to compatibility: Ensure that the selected accessories are compatible with the original factory accessories to avoid installation difficulties or system failures caused by size or interface mismatches.

Maintenance skills:

Regularly check hydraulic oil: Regularly check the oil level, cleanliness, and viscosity of hydraulic oil, and replace contaminated or aged hydraulic oil in a timely manner.

Check for leaks: Regularly check for leaks at all connections of the hydraulic system, promptly address any leakage issues, and avoid system pressure drop and environmental pollution.

Cleaning the filter element: Regularly clean or replace the hydraulic oil filter element to maintain the cleanliness of the hydraulic oil and prevent impurities from entering the system, causing wear and blockage.

Pay attention to system pressure: Monitor the pressure of the hydraulic system. If abnormal pressure is found, stop the machine for inspection in a timely manner to avoid overloading the system and damaging components.

2、 Transmission components: the walking force of Doosan excavator

The transmission components are the "legs" of the excavator, responsible for transmitting the power of the engine to the walking device, achieving the walking and turning of the excavator. The transmission components of the Doosan excavator mainly include:

Rotary reducer: transfers the power of the engine to the rotary motor to achieve the rotary motion of the excavator's upper platform. The rotary reducer of Doosan excavator usually adopts a planetary gear structure, which has the characteristics of high transmission efficiency and strong load-bearing capacity.

Walking reducer: transmits the power of the engine to the walking motor to drive the excavator to move. The walking reducer of Doosan excavator usually adopts planetary gear structure and is designed according to different walking modes (such as track type or wheel type).

Rotary bearing: connects the upper platform and lower chassis of the excavator, bears the weight and working load of the upper platform, and realizes the rotary motion of the upper platform. The slewing bearing of Doushan excavator usually adopts a large rolling bearing structure, which has the characteristics of strong bearing capacity and high slewing accuracy.

Drive wheel/sprocket: The drive wheel of a tracked excavator transmits the power of the walking motor to the track, achieving the walking of the excavator. The driving wheels are usually made of high-strength alloy steel, which has the characteristics of good wear resistance and high strength.

Purchase suggestion:

Matching model: When selecting transmission components, ensure that they match the model and specifications of the excavator. For example, different models of excavators may require different specifications of slewing bearings.

Consider operating conditions: Select appropriate transmission components based on the working environment and usage conditions of the excavator. For example, excavators operating under heavy loads or harsh working conditions should choose transmission components with stronger load-bearing capacity.

Emphasize quality: Transmission components bear significant loads and impacts, therefore reliable and durable accessories should be selected.

Maintenance skills:

Lubricate the slewing bearing: Regularly lubricate the slewing bearing to reduce friction and wear, and extend its service life.

Check the driving wheel/sprocket: Regularly inspect the wear of the driving wheel/sprocket, replace severely worn ones in a timely manner, and avoid affecting the walking performance of the excavator.

Check the tension of the track: Maintain the appropriate tension of the track. Being too tight or too loose can increase walking resistance, resulting in power loss and component wear.

Avoid prolonged idling: Avoid prolonged idling of excavators and reduce wear on transmission components.

Summary:

The hydraulic system and transmission components are the core components of the Doosan excavator, and their performance directly affects the efficiency and reliability of the excavator. By gaining a deep understanding of these two systems and mastering the correct selection methods and maintenance techniques, it is possible to effectively improve the utilization rate of excavators, reduce operating costs, and extend their service life. I hope this article can provide valuable reference for users and maintenance personnel of Doosan excavators.