Your Main Supplier Of Excavator Main Pump In China

Xugong KS Available with Most Efficient Excavator Main Pump

  • Affordable, top quality, fast delivery
  • Suitable to the different sized excavator, 10-60 tons’ excavator
  • Quality warranty
  • New Aftermarket, Genuine, Remanu excavator main pump

XuGong KS Excavator Main Pump Quality Certification

  • ISO9001
  • KS CE
  • SGS
  • ISO 9001

Xugong KS Top Running Excavator Main Pump

Komatsu PC200-7 Excavator Main Pump

PC200-7 Hydraulic Pump, Part Number 708-2L-00300 For Sales. Various Excavator Main Pump Available

JCB Backhoe Hydraulic Excavator Main Pump

JCB Backhoe Hydraulic Pump 20/925580 Excavator Main Pump 20/902900 Hot Sale Good Price.

Komatsu PC50MR-2 Excavator Main Pump

Komatsu Excavator Main Pump, PC50MR-2 Hydraulic Pump, Part Number 708-3S-00522

Hyundai R210-7 Hydraulic Excavator Main Pump

Hyundai Excavator Main Pump, Original R210-7 Hydraulic Pump, Part Number 31N6-10051

Hyundai R250-7 Hydraulic Excavator Main Pump

Hyundai R250-7 Excavator Main Pump 31N7-10011, Wholesale Stocked For Fast Shipping

Volvo EC290B Hydraulic Excavator Main Pump

High Quality Volvo Excavator Main Pump EC290B Hydraulic Pump, Part Number 14524052

Daewoo SOLAR 300LC-7A Excavator Main Pump

Doosan Excavator Main Pump, Daewoo SOLAR 300LC-7A Hydraulic Pump, Original Quality

EC160B EC140B EC180 Excavator Main Pump

Kawasaki K3V63DT Hydraulic Pump, EC160B EC140B EC180 Excavator Main Pump 14531858

Hitachi ZAX30U ZAX29 Excavator Main Pump

Nachi Piston Pump PVD-1B-32CP-8G5-5022A, Excavator Main Pump For Hitachi ZAX30U ZAX29

Why Xugong KS is Your Main Excavator Main Pump Supplier?

Xugong KS supplies various excavator main pumps for different excavator brands such as Hitachi, Kobelco, Doosan, JCB, Hyundai, Caterpillar. Kawasaki, etc.

Whether you need a new, OEM, aftermarket, or reman excavator main pump. You can easily select it here at Xugong KS. Send us an inquiry now, we sales expert will reply you within 8 hours working time.

excavator hydraulic pump vedio cover

Xugong KS Other Fast Running Excavator Main Pump Parts You May Interesting

K3V112DT Hydraulic Pump Parts
K3V112DT Hydraulic Pump Parts
High Quality OEM Standard Replacement For Hydraulic Pump Repair
EC460B Hydraulic Pump Seal Kit
EC460B Hydraulic Pump Seal Kit
Plenty Models of Hydraulic Pump Seal Kit Are Available For Your Choice
ZAX350-3 HPV145 Pump Gearbox
ZAX350-3 HPV145 Pump Gearbox
Hitachi Excavator Hydraulic Pump Gearbox, Part Number 1022441
ZX200-3 Hydraulic Pump Solenoid Valve
ZX200-3 Hydraulic Pump Solenoid Valve
ZX200-3 Hydraulic Pump Solenoid Valve Actuator Valve, P/N: 9254306

XuGong KS Excavator Main Pump Factory Overview

Are You Looking For A Quality Excavator Main Pump?


Excavator main pump generates a flow that overcomes pressure leading to excavators’ great functions. It is a vital component and if it fails the whole system will be inactive. Xugong KS offers the best and efficient excavator main pump for your replacement.

Regardless of what you need, Xugong KS got you covered. Wide choice of new, OEM, aftermarket, and rebuild excavator main pump are available. We have supplied to all major excavator brands so we will surely cover you. From excavator main pump, hydraulic pump and as well its spare parts. They are all available in the Xugong KS database.

To make sure there are no implications when we provide the excavator main pump. We generally need your excavator model number, Oem part no what excavator application. In that way, our sales team can offer a specified excavator main pump based on your information. When you need parts for repairing your excavator main pump, we also have excavator main pump parts, such as cylinder block, valve plate, piston shoe, excavator main pump seal kit, plate, etc. Just let us know your parts no. regarding it. These are all quality and durable excavator main pump parts. A long warranty is provided also for your assurance. Get your excavator main pump replacement now.


Excavator Main Pump – The Complete FAQ Guide


Excavators are vastly known for their immense power in the construction world. It can work on complex tasks for long, tirelessly. It receives its power from its engine, which pumps pressurized oil to its main hydraulic pump.

The main hydraulic pump is a vital component of the excavator. The excavator cannot function without its main pump. In this guide, you are going to find out:

  • What an excavator main pump is and how it functions
  • How to troubleshoot a faulty main pump and also how to care for it
  • Where to get the best excavator main pump in the market today

Keep reading this guide to find out more about the excavator main pump.

1.  What Is An Excavator Main Pump?

An excavator main pump is a primary pump in which your excavator’s engine pumps high pressurized oil to move the excavator. Apart from moving the excavator, this main pump enables the excavator to complete heavy tasks.

Figure 1 - Excavator Main Pump
Figure 1 – Excavator Main Pump

Check this out:

The excavator main pump will supply pressurized oil at approximately 5,000 pounds per square inch (psi). Its vitality cannot be underestimated.

Your excavator also has a secondary hydraulic pump called the gear pump. However, it is not as strong as the main pump as it supplies pressurized oil at 700 pounds per square inch.

2.  How Does An Excavator Main Pump Work?


Your excavator works like a system whose components are interdependent.

Here’s why:

Your excavator engine acts as the powerhouse of your excavator. Once you start it, the engine activates the other components, including the main pump. The engine works hand in hand with the main pump.

Your excavator main pump is a variable displacement pump that has a rather complex working principle. Check out this short video that clearly illustrates how each internal component of the main pump works in this equipment to produce linear power for your excavator.

Your excavator main pump works by supplying pressurized hydraulic fluid from the engine at around 5,000psi.


3.  What Is The Price Of An Excavator Main Pump?


Here’s the truth:

There are different makes and models of excavators in the market today. Each make/model has its unique excavator main pump specifications. Therefore, it is challenging to provide an actual price for an excavator main pump.

You can reach out to a professional and reputable company to help you out with the pricing. KS has competitive prices which meet your requirements as well as your budget. Our primary mission is not to sell excavator aftermarket parts but to solve your excavator problems.

We’ll be happy to hear from you and, more importantly, to help you out get the best price for your excavator main pump.


4.  What Are The Common Causes Of Excavator Main Pump Failures?


Your excavator main pump is bound to fail over time due to the regular wearing out of its internal parts. Apart from normal wear, your excavator main pump can fail prematurely because of the following reason:


1.   Contaminants

Contaminants damage your main pump by entering through holes or through regions on the main pump that are loose. There are two main types of contaminants that cause premature failure in your excavator main pump:

  • Water – accounts for 90% of all excavator main pump failures.
  • Air – Air contamination is further broken down into two sub-groups:
    • Cavitation – when your excavator main pump has cavitation, it’ll produce a whining sound. It would be best to handle this issue urgently whenever you hear it coming from your excavator main pump.
    • Aeration – This happens when your excavator main pump allows external air to enter inside it. Aeration occurs when your excavator main pump has loose components. Also, when your excavator main pump has aeration, you may hear knocking sounds as the machine runs.

It would be best if you’d handle all contamination symptoms as soon as possible to avoid damaging the whole excavator main pump.


2.   Hydraulic Fluid Level and Quality


It’s crucial to assess the quality and quantity (level) of your hydraulic fluid. Hydraulic fluid levels might cause severe damage to your main pump.

Minimal quantities of hydraulic fluids, for example, can cause cavitation. Your main pump will also overheat as a result of this. When the hydraulic fluid in your excavator leaks, you’ll have the same issues.

Different hydraulic fluids are compatible in different scenarios; thus, your excavator main pump’s quality is vital. Hydraulic fluid quality is also crucial because it helps you extend the life of your excavator main pump.

3.   Human Faults


Human faults include manufacturing sub-standard excavator main pumps and improper installation, and poor handling of the pump. Also, poor maintenance is another factor that leads to the premature failure of your excavator main pump.

You need to have a licensed mechanic help you out in installing, maintaining, and repairing your excavator main pump. It would also be best if you’d have your whole excavator checked on frequently by the licensed mechanic.

4.   Oil Temperature-Related Issues


There are usually two main problems related to excavator main pump oil – it can be too cold or too hot.

Check this out:

Whenever your excavator main pump oil gets too cold, it tends to thicken and become highly viscous. When this happens, adequate oil may fail to reach your excavator’s main pump. It is therefore imperative to wait for your oil to heat up after starting your excavator engine.

It will improve your excavator’s performance in general and lengthen the service of your main pump.

The second oil temperature-related issue is when your excavator main pump’s oil is too thin. Oil thinning happens when your excavator works in an extremely hot environment. When your excavator main pump oil gets too thin, it can start leaking.

Also, it does not lubricate the main pump’s internal parts as expected. Oil thinning happens when you use low-quality oil.

The third oil temperature-related issue is oil oxidation. Whenever your oil gets too hot, it’ll start thickening because of oxidation. When oil oxidizes inside your main pump, it forms build-ups inside the pump. Build-ups are dangerous as they can damage the whole main pump.

Your main pump will overwork, overheat and ultimately blow.

5.  What Are The Components of An Excavator Main Pump?


Your excavator main pump has internal components which work together to power your excavator. Check them out:

Figure 2 - Excavator Main Pump Components
Figure 2 – Excavator Main Pump Components


  • Piston shoe
  • Cylinder block
  • Valve plater
  • Retainer plate
  • Coil spring
  • Press pin
  • Ball guide
  • Washer upper
  • Washer nether
  • Snap ring

KS can supply you with these components whenever you need them. We have over 10,000 excavator main pump parts in stock. We also do not have a minimum order quantity. You can choose to order just a single component or in bulk.

You’ll only need to specify the make and model of your excavator. KS manufactures excavator parts for globally leading excavator makers like Caterpillar, Komatsu, Kobelco, Isuzu, Volvo, etc.

Our excavator main pump parts have a 90-day warranty cover duration. However, that doesn’t mean that we ship faulty parts to you. Our quality control team ensures that your parts have been tried and tested in real-life excavator simulations.

Here’s the best part about buying your excavator main pump or its components from KS:

We’ll ship them over to your desired location. Our experience in the past decade made us form long-lasting working relationships with the world’s top logistics companies like DHL, FedEx, TNT, etc.

Reach out to us today with your requirements and estimated budget. We’ll respond as soon as possible with a solution that meets both your needs and your budget.

6.  Where Is The Excavator Main Pump Located In The Excavator?


It’s true that:

Different excavator models have different designs. Your excavator operational and service manuals both explain where to find every excavator component.  They most likely have a diagram of where you can find your engine, your excavator main pump, gear pump, etc.

They also show you how to access, maintain and service these parts.

It would be best if you’d refer to them for your specific excavator make and model.

7.  Why Does My Excavator Main Pump Leak?


Your excavator main pump could leak because of several reasons. What’s important is first to identify the type of leakage to know how to handle it accordingly.

Figure 3 - Leaking Excavator Main Pump
Figure 3 – Leaking Excavator Main Pump

Check this out:

There are two types of excavator main pump leakages:

  • External leakage
  • Internal leakage

External leakage is easy to identify. You can identify it visually by checking for oil spills on the surface of the excavator main pump.

Internal leakages are a bit hard to identify. However, you’ll experience some anomalies like premature pressure drops, inefficient performance, etc., that will alert you of internal leakage.

Here’s why your excavator main pumps leak:

The first reason is because of damaged excavator main pump seals or valves. If these seals or valves are damaged, then you’ll need to replace them as soon as possible. This replacement will help you lengthen the service life of your main pump.

The second reason is because of loose components. After servicing, your excavator main pump bolts and nuts may be a bit loose. This looseness will cause leakages.

Word of advice:

For the best servicing, contact a certified professional mechanic to help you maintain your excavator’s major components, e.g. the engine, main pump, etc. If you decide to let an uncertified mechanic do the maintenance, you risk losing your warranty cover.

Further, the uncertified mechanic may rebuild your excavator main pump wrongly, making your main pump wear out prematurely.


8.  What Kind Of Hydraulic Fluid Goes Into The Excavator Main Pump?


As you read earlier, your excavator main pump is one of the key components of your excavator. As such, you have to take care of it. Doing so lengthens the service life of your excavator’s main pump.

Figure 4 - Hydraulic Oil
Figure 4 – Hydraulic Oil

Regular maintenance includes regular oil changes. Selecting the right type of oil to use can be an intimidating process, especially if you are not into technical stuff. However, it is necessary to know which type is ideal for your main pump based on its features.

Here’s what you should check to know the best type of fluid to use:

You need to check for the oil’s viscosity grade and the oil type. Factors that will affect these two main properties are the excavator main pump operating temperature, the pressure the pump produces, etc.

It would be best if you select an excavator main pump oil with anti-wear characteristics that offer a wide range of your pump’s operating temperature.


9.  How Is The Excavator Main Pump Installed In An Excavator?


Installing your excavator main pump is not a walk in the park. It requires some serious muscle, keen eyes, and experienced hands.

Figure 5 - New Excavator Main Pump
Figure 5 – New Excavator Main Pump

Now, your excavator main pump can easily get damaged by contamination of either air or water and heat. It would be best if you’d start by checking the health of your hydraulic tank cap seals, which are responsible for maintaining the excavator’s tank pressure.

If your seals are damaged, consider replacing them immediately as they can cause aeration to your main pump. Also, replace the suction screen with a new one from a recognized excavator parts company.

Drain your excavator tank while replacing the suction screen so that it (suction screen) does not get contaminated. Remember also to replace your excavator hydraulic oil filter. Then, inspect your drive’s condition. If it is not in good working condition, contact a professional manufacturing and supplying company to order a new one.

Now, move on to the new main pump that you want to install. Check all its electrical connectors and ensure that they are not damaged. You should check its voltage to ensure that it works just fine. Incorrect wiring will damage your main pump’s electrical system.

Lift the new main pump to the air using lifting equipment, as a standard main pump can weigh up to 180kgs. You wouldn’t want that to fall on you. Then, apply anti-seize to the main pump’s primary shaft that goes into the drive.

Align the primary shaft to the excavator’s drive and slide it into the drive. As you wind up the installation process, fix all the hydraulic hoses as they should and connect the electrical components correctly.

Remember to tighten your hydraulic hoses. Failure to do that will cause aeration, which will eventually damage your excavator main pump.

Installing a new filter is the greatest way to ensure that you get the best results. Then, run the excavator’s engine at 60 percent RPM for up to four hours (minimum two hours) after installing the cleanup filter.

Warming your hydraulic system helps to prevent debris from entering your system. Debris might travel through your hydraulic system if the hydraulic fluid is still cold.

Install the suction screen and put everything to how it should be as specified in your operational and service manuals. You can get rid of the unnecessary air inside the pump by bleeding it (air) from your excavator’s highest cap.

You’ll still need to get rid of the air in your excavator main pump. You can do so by using the main pump’s cap. Now, if your main doesn’t have a cap, you can accomplish it by fracturing the suction elbow at the pump until hydraulic fluid leakage occurs.

You should keep in mind that working temperatures depend entirely on where you are in the world. It’s recommended to seek advice from a qualified professional regarding the sort of oil to use in your excavator’s hydraulic system.

Check the level of hydraulic oil in your excavator main pump as it warms up. The rationale for this frequent inspection is that low oil levels lead to moisture (venting), which eventually leads to rusting.


10.  How Can I Tell If My Excavator Main Pump is Damaged?


There are three main ways of finding out if your excavator’s main pump is damaged.

1.   The Main Pump Produces Unusual Noises

Unusual noises are normally not a good thing across all excavator components. When you hear unusual noises coming from your excavator main pump, it means that the excavator main pump internal components are significantly worn out.

If you hear knocking or banging sounds coming from your main pump, then it means that there is either cavitation or aeration. You’ll need to resolve this issue before you continue using your excavator.

Your excavator main pump should work silently when healthy.

2.   Leakages

Leakages on or inside your excavator main pump are a definite way of telling you that there is something wrong with the main pump.

You can handle leakages by replacing worn-out seals and valves and tightening loose components, such as hydraulic hoses.

Figure 6 - Hydraulic Pipe Leak
Figure 6 – Hydraulic Pipe Leak

Remember that there are two types of leakages – internal and external. It’s easier to identify an external leakage as you can visually confirm that. Internal leakages are harder to identify, as they can only be felt based on the main pump’s performance.

3.   Seal Kit-Related Issues


You may replace your seals and still experience premature pressure drops or inefficient performance. In other words, you may still experience leakages.

Your seals may not be the issue, but they may fail quickly because of another underlying issue. Your excavator hydraulic pump may have a misaligned rod. You can solve this issue easily by contacting your favorite mechanic.

If the damage is extensive, consider reaching out to a professional excavator parts manufacturing company.

KS is always ready to listen to you and help you out. Reach out to us today for more information on how to best handle excavator main pump issues.

11.  How Can I Best Troubleshoot My Excavator Main Pump Problems?


Troubleshooting your excavator’s main problems requires you to get your hands dirty. You’ll have to do the following:

  • Check your hydraulic fluids – checking your hydraulic fluids entails checking the fluids’ level and ensuring that it is optimum. Also, you’ll need to check the quality of the fluid – is it okay, or does it need replacement? If it requires replacement, you’ll need to prioritize it. Do not use your excavator until you replace the oil.
  • You should then check your seals and valves. They should also be in excellent working condition. If not, replace them before using your excavator again.
  • Inspect your pump visually for any cracks or any other anomalies.
  • Inspect the excavator main pump’s electrical wiring.
  • Run the machine and test it according to how your operational and service manuals specify.

12.  What Causes Excavator Main Pump Failures?


There are three primary excavator main pump failure causes that frequently appear on all excavators over time.

Check them out:

Contamination – contamination refers to the entry of foreign matter into your excavator’s main pump. Such foreign matter can be water or air. Water is responsible for 90% of the total excavator main pump failures.

Air, on the other hand, is also responsible for these failures. There are two types of air contamination, that is, aeration and cavitation. Aeration happens when air from outside gets into your excavator main pump through a crack or a loose component.

Cavitation happens when there is air inside your excavator main pump, be it from oil replacement or during installing a new main pump. Whenever there is air inside your excavator main pump, you’ll hear knocking or banging sounds as the main pump works.

Oil Temperature-Related Issues – Your excavator main pump oil can cause significant damage to your main pump’s internal components. When oil is cold, it tends to thicken and become more viscous. You’ll need to warm your main pump’s oil by starting the excavator engine and then wait for the oil to become warm.

Also, when your excavator oil becomes too hot, it thins. Thinning is not a good thing as the oil can start leaking from inside the pump. It will also not have any protective features, meaning that your main pump’s internal components will wear out quickly.

Again, when oil becomes too hot, it can oxidize and surprisingly start thickening and forming build-ups inside your main pump. When build-ups get formed, your main pump will start overworking and overheating. This situation finally leads to the premature permanent damage of your excavator main pump.

Check for your oil’s level and quality – your excavator main pump oil level is important as it can show you any unnoticed leakages. Also, the oil quality is important as it shows you whether oil replacement and general servicing are due or not.

It would be best if you’d always buy high-quality hydraulic oil for your main pump as specified by your excavator’s manufacturing company.

Human faults can also lead to excavator main pump failure. If your mechanic fails to install the pump’s internal components as they should, the machine will not work as optimally and efficiently as it should.

If you fail to correct the situation as soon as possible, your main pump will eventually get permanently damaged. Your mechanic should not fix the hydraulic hoses in a way that will strain them as they can easily get damaged. It’ll also prevent aeration contamination.


13.  How Can I Repair My Excavator Main Pump?


Repairing your excavator main pump should be done by a licensed mechanic. The process is fairly easy, as you’ll only need to identify the spoilt part, determine the degree of damage and then repair or replace accordingly.

For example, if the main pump’s primary shaft is damaged, you can order another one from KS and replace it. However, if your main pump’s issue is not that serious, for example, cavitation, your mechanic should be able to repair it easily.

Bottom line:

Only a licensed mechanic should handle your excavator main pump. Otherwise, you risk voiding your warranty cover. For minor issues, repairs are recommended as they are cheaper and quicker. You’ll need to replace them with new parts from reputable manufacturing and supplying companies for extensive damages.


14.  How Can I Best Maintain My Excavator Main Pump?

Figure 7 - Properly Maintained Excavator Main Pump
Figure 7 – Properly Maintained Excavator Main Pump

Maintaining your excavator main pump is a hard habit to form that makes your life easier and lengthens the service life of your main pump.

You can first start by regularly inspecting the main pump visually for any leakages. When you realize that there is oil spillage on the surface of your excavator main pump, you should take action immediately.

You can also maintain your excavator main pump by servicing it at regular intervals. When servicing, remember always to use high-quality replacements. You should also replace your excavator main pump oil that your excavator’s manufacturer has recommended.

The final way of properly maintaining your excavator main pump is by always listening for anomalies as the machine works. Anomalies such as knocking or banging sounds should tell you air inside the excavator main pump.

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