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XuGong KS Excavator Swivel Joint Quality Certification

  • ISO9001
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Xugong KS Excavator Swivel Joint Manufacturer

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XuGong KS has careful inspection to ensure durability ,reliability, and smooth operation of Excavator Swivel Joint.
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XuGong KS Excavator Swivel Joint Manufacturer Overview

The Most Heavy-Duty Excavator Swivel Joint in China Only at Xugong KS 


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Excavator Swivel Joint – The Definitive FAQ Guide


In this FAQ guide, you will find the most common questions and answers about excavator swivel joints.

Excavator swivel joint FAQ is the easiest way to learn about common manufacturers, suppliers, and exporters of excavator swivel.

This guide pertains to an excavator swivel joint information, cost, maintenance requirements, how long it lasts, what issues are associated, and much more.


1.    What is an excavator swivel joint?

An excavator swivel joint is a crucial part of any excavator and can be defined as the point on an excavator that allows it to function as an articulated machine.

Figure 1. Excavator Swivel Joint

An excavator swivel joint is the connection point of high-pressure hydraulic systems components that are used to join hydraulic hoses together.


It allows for independent movement so that excavation tools can be moved around the worksite.

In simple words, it powers various excavator hydraulic parts.

By design, an excavator swivel joint houses a sealed system designed to allow minimal leakage and maximum extension.

Depending on manufacturer specifications, the seal system uses rubber O-rings on the port casing and an elastomeric gasket on the housing front or backplate.

The seal system prevents fluids from leaking in either direction in the axle swivel joint.


2.    How do excavator swivel joints work?

Excavator swivel joints are one of the most complicated parts of a hydraulic excavator. Swivel joints are used to create motion.

They create the motion by transferring hydraulic pressure into rotary motions.

Figure 2. How Excavator Swivel Joint Work

Swivel joints receive the pressurized fluid from hoses and pass it through their internal systems, creating torque from the pressure.


This rotational force is then transferred to one or two swing motors.

The swing motors move hydraulic fluid in and out of different ports to make the excavator hydraulic parts achieve their desired motion in any direction.

Swivel joints allow the equipment to work efficiently and even prevent unnecessary damages.


3.    What materials are used in making an excavator swivel joint?

Excavator Swivel Joints are made up of various materials, including carbon steel, alloy steel, rubber, PTFE, and stainless steel.

Excavator swivel joint utilizes wear ring, bearing, and sealing ring.

Mechanical seals are usually used to prevent the leakage of hydraulic oil.

In addition to this, an O-ring is also used to prevent leakage between the flange joints (i.e., joint).

Swivel joints are also offered in a variety of sizes to meet the needs of the customer.

The different designs and materials used in making excavator swivels help reduce overall costs and boost production while retaining customers’ quality and functionality.


4.    Is noise associated with excavator swivel joints?

Yes, noise can be associated with excavator swivel joints. Several factors can generate noise from the joint: –

  • The weak or cracked bushing on gear or lead screw
  • Damaged or missing lubrication seal from the rear bearing
  • Corrosion due to lack of lubrication
  • Incorrect oil viscosity
  • Lack of preload or backlash

In most cases, correcting these issues will eliminate the noise from the swivel joint.

Loose bolts cause noise on the swivel joints, which allow negative pressure in the hose assembly, accompanied by air from leaks between the bellows and piping.

However, in some cases, these noises are usually more related to the hydraulic system than to the actual swivel joint.


5.    What is the cost associated with excavator swivel joints?

The cost of the average excavator swivel joint is a perplexing question since there are so many variables to take into account.

These variables include the quality of the joint, type of engine, size, amount of time spent using the excavator, and the range of movement.

The size or type of excavator will also provide a more accurate estimate of the price.

Usually, the cost of a high-quality excavator swivel joint is $500 to $700 per piece.

The price of an excellent design excavator swivel joint varies from $400 to $500 per piece.

The higher the cost, the more significant the quality and thus leads to the longevity of your excavator hydraulic system.


6.    What type of oil goes into the excavator swivel joints?

The swivel joints of excavators will include various types of blends of hydraulic fluid.

The brand name or common oils used may vary on different manufacture, models, and makes of excavators.

The oil must meet the fundamental properties outlined by the API (American Petroleum Institute).

Figure 3. Oil for Excavator Swivel Joint

This particular oil must meet high standards regarding viscosity, Sulfur content, film strength, and flashpoint.

The oil used in the excavator swivel joints is either mineral-based or synthetic lubrication oil.

These types of oil increase lubrication as well as increase the efficiency of excavator swivel joints.

The hydraulic oil must be able to withstand higher pressure and temperature fluctuations.


7.    What is the life associated with excavator swivel joints?

The life of the excavator swivel joint depends upon many factors such as usage, regular oil maintenance, keeping dirt and mud away from the swivel joint.

Other factors are the operating environment which includes temperature extremes and the condition of circuits carrying high pressures.

Firmly mounting the excavator to the foundation with special hangers should be a point of consideration when using the machine continuously.

The life of any machine also depends on how it is maintained. It will also depend on the type of job it processes all day long. However, in general, a swivel joint will last around ten years.

You can increase the life associated by following timely replacement measures for faulty components or swivel joints.


8.    What are the problems associated with excavator swivel joints?

Excavator swivel joints are subjected to stress from various forces; loads, position, and rotation.

Figure 4. Excavator Swivel Joint Problems

The problems can be extensive and include complete joint failure, lose or broken components, oil contamination from worn seals and gaskets, pinching from bent or misaligned components, and a host of other issues.


In addition to excavator downtime due to joint problems, operators have been injured by swivel leaks or failures that blur their vision leading to accidents.

Excavator swivel joints are complex components that require regular inspection and maintenance.

If you fail to maintain the condition of your swivel joint, you risk damage to your machine, operator injury, and a reduction in productivity.


9.    What characteristics are embedded in excavator swivel joints oil?

The high-temperature-type refined base oils are strengthened with suitable additives to satisfy high temperature and load carrying capacity demands.

For rotary swivel joints, high-quality lubricant is essential to protect high-speed engines, increase equipment reliability, and prolong machine service life.

Hydraulic oil tends to be more efficient in heat dissipation and lower freezing temperatures over the long term.

Excavator Swivel Joints oil can be made of high-quality additives, and these additives contain the following characteristics:

  • Corrosion inhibitor
  • Anti-foam agent
  • Viscosity index improver
  • Oxidation stability improver
  • Rust inhibitor

These associated characteristics prevent unnecessary downtime for repairs and keep you operating at peak productivity.


10.  What are the maintenance requirements of the excavator swivel joints?

Maintain excavator swivel joints by regularly flushing the hydraulic system.

This removes debris and helps to block the flow of petroleum-based hydraulic oils.

Some manufacturers recommend changing the oil after 200 hours of use, while others require changing it every 50 hours.

Regularly inspect for leaks, especially at the swing motors and overhead hose connections.

In addition, clean the swing coupling designs every 200 hours through manual disassembly, followed by degreasing and reassembly.

Other regular maintenance includes cleaning and inspecting hoses for cracks and leaks and replacing dirty or cracked gaskets on components.

When installing a new swivel joint, make sure that you don’t tighten the bolts with excessive force. This will cause oil leakage and significantly shorten the life of your new joint.


11.  What is the role of hoses in the excavator swivel joints?

The hoses in the excavator swivel joints are the main path of hydraulic fluid flow between hydraulic motors and the directional movement control valves.

The control valves activate and deactivate directional movement in the swing motor.

Figure 5. Hoses in Excavator Swivel Joint

When a directional movement is activated, such as in the “down” direction, oil is drawn into the piston of the directional movement cylinder with a proportional pressure to the throttle setting on the valve itself.


The hoses in the excavator swivel joints have two working purposes.

The first is to keep the hydraulic fluid from leaking out of the joint while also keeping external contaminants outside the joint.

The second is to keep the hydraulic fluid at a constant pressure while inside its respective hose.


12.  How would you define the role of flow paths in excavator swivel joints?

The role of flow paths in the excavator swivel joints is to direct a fluid from one part of the joint to another.

The fluid will follow the path of least resistance, and therefore determine where the fluid will go.

Figure 6. Flow Paths in Excavator Swivel Joint

There must be a way for the fluid to move from one port on a joint to another for this to happen.


However, it also serves as a filter that keeps dirt and debris from entering the hydraulic system.

This filters sand and other abrasive particles from dirty fabric hoses inside of your lift truck to prevent them from damaging vital parts of the articulation valves and lines, which could cause leaks or severe damage, which would otherwise lead to expensive repairs.


13.  What powers excavator swivel joints?

Swivel joints are powered by hydraulic flow, which is supplied via hoses.

A pump is attached to the engine of an excavator and runs continuously, which allows the hydraulic fluid to flow through the loop of hoses supplying the swivels on the loader arm.

The amount of hydraulic flow that a particular swivel joint receives depends on whether the hydraulic components are in operation.

The most commonly used excavator swivel joints are mechanical rotation driven by the auxiliary engine or diesel engine by using hydraulic fluid as a power source for the automatic process.

As swivel joints are susceptible to leaks, monitoring and maintaining them regularly is imperative not to risk machine reliability or safety.


14.  How to install an excavator swivel joint?

The installation procedure of an excavator swivel joint is as follows:

First, take the fitting tool kit at hand and then unscrew and remove the bolts located on both sides of the swing joint to uninstall a faulty or malfunctioning swivel joint.

Figure 7. Installing a Excavator Swivel Joint

These bolts are used to clamp down the side outlet port of the swing motor.


After removing the two bolts, pull back on the locking tab while twisting the black O-ring in front of the port.

Now replace the desired components and mount them similarly to the isolation procedure.

The joints have rotation ports, connect these ports with other components like the oil pump, pressure relief valve, flow meter, and expansion tank in an excavator through transmission pipelines.

A good suggestion for installing an excavator swivel joint is to ensure that it is not too tight or loose during use.

If not installed properly, excavator swivel joints can be damaged during regular operation, leading to leaks or catastrophic failures that can lead to severe injury or death.


15.  What causes the failure of excavator swivel joints?

When excavator swivel joints are exposed to long-term loads and high pressures, their rotating parts can wear down, causing leakage and eventually failure.

Industry experts suggest that swivel joint failures typically happen due to poor design, pressure spikes, and abrupt swiveling movements.

The main wear on the swivel joint is caused by the rotation of the rotating parts inside the stationary collar.

This causes high pressure between the rotating parts and the stationary collar, which can cause localized hot spots, abrasion, and erosion.

To ensure the safety of Excavator Swivel Joints, manufacturers recommend regular fluid level checks along with swabbing joints for damages every once in a while.


16.  What is the role of the control valve in excavator swivel joints?

A control valve is an adjusting mechanism used to regulate the fluid flow in an excavator. Swivel joints should have valves to regulate the flow of hydraulic fluid to avoid unnecessary torque on the joint.

There are two types of valves used in the excavation process: spool and body.

The spool-type valve is often referred to as a “ball valve” due to its ball-shaped design. This type of valve is usually smaller than most, allowing it to fit into tight spaces.

It has a simple design that allows it to work in different applications where other types would prove problematic without modification.


17.  Is friction associated with excavator swivel joints?

Friction is associated with the swivel joint but is a problem if not utilized correctly.

Several factors determine how much friction is created in the swivel yoke, including tightness of hydraulic hoses, size of hoses and fittings, operating temperature, and wear on components such as seals.

A significant factor that contributes to the wear and tear of the excavator swivel joints is friction.

Friction is experienced due to the ‘interaction’ between two surfaces applied with different pressure against each other.

The frictional value is reduced by operating the swing joint in a different direction, e.g., rotating it in the opposite direction of its last use, or by utilizing more efficient swing motors and compact design and materials of the joint itself.


18.  What is the role of seals in excavator swivel joints?

The seal is an essential component of swivel joints. It contributes to the life of hydraulic cylinders and rotates systems.

Excavator swivel joints use seals to keep the central pivot in place, preventing leaks and maintaining the positive connection of the various hydraulic lines that feed the joint.

Swivel joints also require seals’ ability to withstand extremely high pressures.

The pressure in an excavator’s swing motor is enough to cause oil to leak past a seal that cannot stop or hold that pressure.

The role of seals in excavator swivel joints is to keep the joint lubricated and prevent debris from contaminating hydraulic hoses and lines.


19.  What is the manufacturing process of excavator swivel joints?

The manufacturing of excavator swivel joints is a complex process involving several stages of craftsmanship and control processes to produce the highest-quality product.

The first manufacturer gets a joint blank from the machine performance testing room.

Then, it is sent to the billing department so that rough machining can be done. After that, it will be processed by the turning machine or a grinding machine to reach the required dimensions.

After the machining process, it still needs to be painted, shot blasting, and buffing for better glossiness.

After that process, the surface inspection is done to inspect whether there is any problem in shape and size. Finally, an electroplating process is needed to solder your excavator swivel joint.


20.  What do you mean by the Hs code of excavator swivel joints?

The HS Code of an excavator swivel joint is of great importance when importing or exporting your excavator swivel joint.

Hs code comprises 6 to 10 digit numbers which help identify the traded goods.

Hs code also supplies essential information about the particular product placed in inventory stock and help supplier to run out of inventory stock.

Hs code provides importing time, the quantity of importation, price per unit, the total cost of stock imported, time and date of import, importing port.

Hs code helps in keeping the detailed information about Hs code of excavator swivel joint.

It is a harmonized coding system followed worldwide among various countries developed by their coding organizations.


21.  Can I get an excavator swivel joint on sale?

Yes, you can get an excavator swivel joint from any supplier who is offering a sale.

You can find a supplier of excavator swivel joint who has his store either online or offline.

A good and reliable supplier can help get your excavator swivel joint at much less cost than usual occasions.

Sales for excavator swivel joints are offered round the year on online or local offline stores.

The work you need to find such suppliers will help you get your excavator swivel at a cheap rate and provide you with the opportunity to get a quality product.


22.  Can I get my excavator swivel joints repaired?

Yes, your excavator swivel joint may be repaired by replacing the damaged components.

You can get it repaired if you are a professional or repaired by professionals located in your area.

If you want to replace damaged components yourself, you must have the fitting tool kit.

The components are any parts of the hydraulic system that are susceptible to external damage.

Damage can take place from hard impacts, rough terrain, or improper use.

The actual repair procedure depends heavily on the type of damage that has taken place and the hydraulic system employed in your excavator.


23.  What is the role of bearing in excavator swivel joints?

As the main component of the excavator swivel joint, the bearing needs to provide support, transmit torque, and resist wear.

The bearing has significant functions in excavator swivel joint such as bearing machine body, distributing the direction and magnitude of torque within working range, preventing the fluid leak from axial and radial ports under high pressure, either discharged or produced.

There are many types, such as needle bearing, ball bearing, spider web bearing, or sleeve bearing.

The sleeve bearing type is more widely used than other types due to its cost-effectiveness and high reliability.

Good bearing is the foundation of the excavator swivel joint. Inspection of excavator swivel bearing is essential for preventive maintenance work, while breakdowns are the leading cause of excavator downtime.


24.  How do excavator swivel joints help the hydraulic system of your excavator?

Excavators use a hydraulic system to lower and raise the bucket. From the manifold and valves to the cylinders, you need all of these components to be functional for your machine to work correctly.

One component that is often overlooked but essential is the swivel joint.

This simple part helps everything work by allowing the manifold and flow control valve to operate.

Excavator Swivel Joints improve the efficiency of all hydraulic components of your excavator.

It is a piece of convenient equipment to control direction or delicate operation.

Excavator swivel joints are an easy and economical way to prevent premature failure of expensive hydraulic components.

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