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The swing motor PC120 8 has a few typical variants and some common replacement variants. The typical variants with a planetary gearbox include swing motor VIN mini 1B, swing motor PC30 (K3V112DT), swing motor KX040 (K3V40DT), swing motor Hitachi ZX35U, and swing motor PC40 (K3V108DT). Their specifications include a voltage of 24-ur LDC, a motor speed of 700-1200 RPM, a no-load PSC swing current of 2-3A, and a load swing current of 10-12A. The capacities of the swing motors for mini excavators are generally 0.5-4.0L. In comparison, the typical alternatives with a wheel gearbox include swing motor PC120 8, swing motor PC160 8, swing motor PC180 8, swing motor PC220 8, swing motor Deere 210, and swing motor Deere 245.
Standby replacements for the swing motor PC120 8 include swing motor AE2456, swing motor M318527, swing motor PC85-2, and swing motor S1989. The specifications for these substitutions are typically the same. Buyers can also use key parameters such as frame size, axle size, wheel size, maximum deviation from gear center, and pin diameter to determine the applications of the swing motor. The swing motors usually have a direct drive system with 14 teeth and a reverse drive with 20 teeth, which is straightforward to install and operate.
The swing motors can directly interconnect based on the back cover's bolt pattern, which is a common interconnect method. Further, their existing ratio is usually 3:10, 19:10, or 2:1, and they are manufactured with output bearing tracks, oil seals, gaskets, and bronze bushes. Their input gears include the motor, output gears with different RPM ratios, and then the swing gears for distributions. Some of the swing motors may have a planetary gearbox of 10-teeth input/output and reverse gear of 4-teeth.
The swing motors for excavators generally have a compact design with a fixed outer body to resist jarring during pressure changing and high temperature and protect from dust and water.
Model:
The model designation is PC120-8. It is a unique identifier that distinguishes it from other models and represents the motor's design and features.
Output torque:
0-30knm (Variable range): The output torque of the swing motor can change from 0 to 30 knm, which shows a large twisting force and feels powerful.
Output:
It has an output of 25L/min, reflecting a strong motor ability and providing abundant energy for operation.
Weight:
It weighs about 150Kg, which is a heavy object, ensuring stability and durability during operation.
Swing angle:
The swing angle of the motor can reach 360 degrees, which has a broad scope of activity, meeting various operational needs.
Keeping the swing motor working properly is the key to excavator performance. Regular inspection is the basis for finding potential problems as early as possible. Check swing clearance, temperature, and noise. Conduct timely repairs if there are any abnormalities. Pay special attention to the lubrication of important transmission parts. Regularly add grease to reduce friction between bearings and improve service life. Also, ensure that the sealing components remain intact. Strong sealing performance is vital for preventing dust and impurities from entering the inside of the motor. Those will keep the swing motor in a clean working environment.
Moreover, maintain the stability of the swing motor's work by focusing on the maintenance of the reducer. Check the amount of oil in the gear box to ensure that the swing gear is lubricated properly. At the same time, keep the cooling system of the swing motor in good condition, ensure effective heat dissipation, prevent the motor from overheating, and avoid damaging its internal components.
In addition, the user needs to establish a regular maintenance system and record the relevant parameters and maintenance processes for the swing motor. Regular calibration and adjustment are as per manufacturer instructions to ensure the optimal performance of the motor. Through these maintenance methods, the user can ensure the normal operation and service life of the swing motor.
Swing motors, like the swing motor pc120 8, are the driving force behind the rotational movements of excavator cabins and working equipment. These gears shift excavators in various directions to facilitate their digging and dumping actions without the machine having to move linearly.
The primary application of swing motors is to ensure that the upper structure or cabin of an excavator moves appropriately in sync with the movement of its digging bucket. For example, while the excavator is positioned at a certain angle to dig into a particular area of land, it may not need to change its entire location to do so. The digging bucket can swing in a sideways direction with the help of a swing motor. This movement enables the excavator to perform various tasks from a stationary position.
Without this motor, the operator would have to move the entire machine each time to dig in a sideways direction, which is a time-consuming process. However, with the swing motor installed, the excavator can easily carry out its digging, loading, unloading, and trenching functions efficiently, quickly, and without the need for complex excavation patterns.
The swing motor has many other applications and is not limited to excavators. Here are some machines in which swing motors are commonly found:
Excavators and Diggers:
Swing motors are utilized in hydraulic excavators and diggers, including mini-excavators, standard excavators, and specialized excavator models. The swing motor excavator allows for the rotation of the excavator's upper section, facilitating digging, loading, and dumping operations with precision.
Robotic Arms:
In robotic systems, swing motors enable controlled swinging and rotation movements of robotic arms, which are common in robotic assembly lines, manufacturing facilities, and automated systems. They are also used in robotic arms for 3D printers and laser cutters.
Wheeled Excavators:
Wheeled excavators, commonly used in urban environments and mobility over short distances, also utilize swing motors for rotation operations similar to their tracked counterparts.
Material Handling Cranes:
Swing motors play a crucial role in port cranes and yard cranes, allowing for the rotation of the crane's arm or jib to pick and place containers, goods, or materials with accuracy.
Mini Excavator Swing Motors:
Mini excavators are compact versions of traditional excavators used in smaller-scale projects and confined spaces. They also utilize swing motors for rotational movements similar to standard excavators.
Mining Shovels:
Mining shovels are large-scale excavating machines used in open-pit mining operations. Swing motors facilitate the rotation of the shovel's digging arm, ensuring precise excavation and material handling in mining applications.
Telehandlers:
A swing motor telehandler uses swing motors to achieve rotary motions, allowing flexibility in reaching and positioning loads in construction, agriculture, and other industries.
When selecting a swing motor for an excavator, buyers should examine several key factors to ensure a proper fit and performance.
Compatibility with PC120-8:
It is crucial to ensure that the chosen swing motor precisely matches the model specifications and design of the PC120-8 excavator. Buyers should verify that the swing motor can seamlessly connect to the excavator's frame and the swing mechanism, ensuring smooth coordination between the two parts.
Quality and Reliability:
The performance and durability of the excavator swing function heavily depend on the quality and reliability of the swing motor. Buyers should choose reputable manufacturers and trusted brands, ensuring that the selected swing motor possesses excellent manufacturing quality and reliable performance.
Warranty and After-sales Service:
A comprehensive warranty and reliable after-sales service can offer added security to buyers. Selecting a swing motor with an extensive warranty and convenient after-sales service allows buyers to receive timely support and assistance if any issues arise with the motor in the future.
Q1: What is a swing motor on an excavator?
A1: An excavator's swing motor is an essential part of the driving system, responsible for allowing the upper structure (usually the cabin with operational components) to rotate or swing around on its base. This function is crucial for the movement and operation of the excavator in various digging and loading scenarios.
Q2: Where is the swing motor located on an excavator?
A2: The swing motor of an excavator can be found at the rear of the upper swing assembly. The component is between the excavator's upper structure and its chassis or lower track frame. The swing motor is usually housed within the swing gearbox, which is attached to the swing ring (or slew ring) of the excavator.
Q3: Which swing motors fit the PC120-6 and PC120-7 excavators?
A3: The swing motor components for the PC120-6 and PC120-7 models, such as the swing motor itself, the swing gearbox, and the swing bearing (or slew bearing), generally have matching part numbers. These part numbers are used to identify the compatible components for these specific excavator models. However, while many components share the same part numbers between the PC120-6 and PC120-7 excavator models, some may be unique to just one of them. Therefore, checking the excavator's documentation and thoroughly examining the component parts for the preferred fit is essential.
Q4: How do users know if the swing motor is faulty or damaged?
A4: The typical signs of a faulty or damaged swing motor include unusual noises. Grinding, clicking, or knocking sounds are common indicators of damage or motor motor bearing issues. Sluggish movement or jerking motion, unexpected stopping, or restricted rotation can also signify a damaged swing motor. Other indicators of a damaged swing motor may include the appearance of oil leaks around the motor or its immediate connecting parts and components, excessive play or looseness in the motor's movement, and error messages displayed in the excavator's diagnostic system. If any of these signs are experienced, it may be time to have the swing motor checked.
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