Excavator Hydraulic Pump


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XuGong KS Excavator Hydraulic Pump For

Top Quality Excavator Hydraulic Pump

Xugong KS provides excavator hydraulic pumps for different excavator brands. Such as Komatsu, Hitachi, Cat, Kawasaki, Nachi, Nabetesco, and so on. You can send me your OEM Part No or your excavator model, and our expert sales manager can quote you immediately with the price and delivery time.

Xugong Ks supply new aftermarket excavator hydraulic pump, genuine excavator hydraulic pump or rebuild excavator hydraulic pump.

If you want to buy some excavator hydraulic pump parts for the rebuild, it is also available. We have a wide array of excavator hydraulic pump parts, such as piston shoes, cylinder blocks, valve plates, seal kits, pins, and so on. With affordable prices and top quality, you can buy the needed parts to repair your excavator hydraulic pump immediately.  Get a quote now!

hydraulic pump for excavator

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XuGong KS Excavator Hydraulic Pump Factory Overview

Looking for an Efficient Excavator Hydraulic Pump For Your Excavator? 

Excavator hydraulic pumps are used to create high fluid pressure for the excavator to work efficiently. From the moment they are installed, excavator hydraulic pumps start to wear out. Often slowly at first, then quickly it is if it’s not quality. Excavator hydraulic pump troubles are usually seen through an increase in noise, heat, a decrease of speed, etc. that can result in hydraulic failure. If you are experiencing this in your system, it means that something is wrong and you need to address it. If not properly manage it can result in severe damage.

There are over 1000 excavator hydraulic pump suppliers available in the market. Xugong KS is the best for you. Xugong KS is here to provide you the most reliable excavator hydraulic pump available.  For over 12-years of industry experience, Xugong KS is the best for your excavator hydraulic pump replacement. Order your excavator hydraulic pump and its spare parts here now at Xugong KS. We got you covered!

Excavator Hydraulic Pump – The Complete Guide

Are you looking for an excavator hydraulic pump replacement? Or are you simply looking to be more enlightened on your excavator’s hydraulic systems? Then this is the guide for you!

It’s true that:

An excavator hydraulic pump is one of the crucial elements in your excavator. It is so essential that an excavator cannot work without it. In this guide, you are going to learn:

  • What an excavator hydraulic pump is and how it works
  • How to diagnose a faulty hydraulic pump and repair it
  • How to replace a defective hydraulic pump on your excavator
  • Where to get the best excavator hydraulic pumps

Keep reading this guide to find out more.

1.  What Is An Excavator Hydraulic Pump?

Excavators are heavy machines. They require a lot of force to move, let alone work. This is where excavator hydraulic pumps come in.

Figure 1_ Excavator Hydraulic Pump
Figure 1_ Excavator Hydraulic Pump

Excavator hydraulic pumps enable your excavator to move around and work effectively and efficiently. Whenever you hear the term “hydraulic,” you can be sure that it means liquid used to carry out a specific task.

You’ll find out how they work as you read this guide.

2.  Where Is The Excavator Hydraulic Pump Located?

You’ll find out that different excavator makes and models have different designs. It would be best to find out the location of your excavator hydraulic pump by reading the excavator’s operational manual.

It’s also essential for you to go the extra mile to read the service manual to find out how best you can maintain your excavator hydraulic pump.

3.  What Are The Components Of An Excavator Hydraulic Pump?

Your excavator hydraulic pump has internal components which work in a systematic way to produce raw power from hydraulic fluids.

Figure 2_ Excavator Hydraulic Pump Parts
Figure 2_ Excavator Hydraulic Pump Parts

Your hydraulic pump has the following components:

Inside the pump, you’ll find the following components:

Check this out:

There are different types and models of hydraulic pumps in the market today. You’ll need to find out which one your excavator uses for the best power output.

KS manufactures and supplies excavator parts in over 50 countries across the globe. We manufacture parts with strict adherence to OEM standards.

We guarantee you quality parts, covered by a 90-day warranty at an affordable price. You can pay us using your favorite payment platform. We are flexible, and we can receive payment from Paypal, Western Union, T/T, LC, AliPay, etc.

Place your order right now by reaching out to us. You can also share with us your estimated budget.

4.  Which Type Of Hydraulic Pump Does An Excavator Use?

Hydraulic excavators have three hydraulic pumps. Among the three pumps, there are two main ones that pump oil at extremely high pressure. These two are called variable displacement pumps.

They are a bit complex in their structure, as you’ll read later on in this guide.

The third one does not pump oil at high pressure; it is a gear pump.

Figure 3_ Excavator Gear Pump
Figure 3_ Excavator Gear Pump

In other words:

Your excavator uses both the gear and variable displacement pumps.

5.  How Does An Excavator Hydraulic Pump Work?

Your excavator has three hydraulic pumps. Among these three pumps, there are two main pumps that supply oil at extremely high pressure. The third one does not provide high pressure compared to the former two.

The two main hydraulic pumps fall under the category of variable displacement pumps. The third pump is simply a gear pump, as discussed earlier in this guide.

However, variable displacement pumps have a quite complex working principle. Consider watching this short 3D video that illustrates clearly how your excavator hydraulic pump works.

6.  How Can I Select My Excavator Hydraulic Pump Based On Its Application?

Selecting your hydraulic pump based on its application can be an intimidating process. Now, there are lots of hydraulic pumps in the market today.

Surprisingly, not all of them are good for your excavator. You’ll need to contact a professional company to help you figure out which hydraulic pump will be ideal for your excavator.

KS will not only help you figure out which hydraulic pump your excavator requires but also supply you with the selected hydraulic pump.

Contact us today for more information on hydraulic pumps. We’ll respond within 24 hours.

7.  Why Does My Excavator Hydraulic Pump Overheat?

There are three main reasons that will undoubtedly cause your excavator hydraulic pump to overheat. Check them out:

1. Poor Maintenance

Your excavator hydraulic pump works so hard. Over time, its internal components wear out. Whenever there is any foreign matter, like debris, it may cause your excavator hydraulic pump to overheat.

Damaged internal components will require repairs or replacement, depending on the magnitude of damage. Further, when your excavator hydraulic oil gets old, it becomes useless. It cannot lubricate and protect the surfaces of the internal components.

Lack of proper maintenance will certainly make your excavator hydraulic pump overheat. There is no shortcut – you’ll have to service your excavator hydraulic systems. It’s important to use the correct type and, more importantly, the correct amount of oil.

It’s imperative to check the oil level of your excavator hydraulic pump regularly. It helps you ensure that there are no leakages in your system. Checking oil also helps you know the quality of oil in the hydraulic pump.

It’s also important to check the condition of the hydraulic pump’s heat exchanger. A faulty excavator hydraulic pump heat exchanger will lead to overheating problems.

 2.   Your Hydraulic System Is Imbalanced

There are times that you’ll need to tweak your hydraulic pump so that it can perform better in a certain task. However, you have to understand that the hydraulic pump is a system that has to work in harmony.

Any changes that you introduce alters the balance of the hydraulic pump, and this may make it overheat. A common adjustment that many professionals make to their hydraulic pumps is by adjusting the pump compensator.

When you adjust the pump compensator, remember to adjust the relief valve as well. It will prevent overheating.

3.   Faulty Upgrades and Modification

There are many excavator hydraulic pump mods and upgrades in the market today. These mods and upgrades will promise you more power and better efficiency. However, not all of them work well with your hydraulic pump.

Check out this example:

An upgrade might promise you a higher flow pump which offers increased capabilities to your hydraulic pump. Have you considered checking if your hydraulic pump’s internal structure can handle that increase in flow?

If the internal structure has smaller hoses and pipes than the flow that you’ve selected, there will be a lot of pressure buildup. This pressure buildup will cause your excavator hydraulic pump to overheat.

8.  How Can I Know If My Excavator Hydraulic Pump Is Damaged?

Whenever any excavator component gets damaged, there are some anomalies that the excavator must show you. You’ll know when your hydraulic pump is damaged when it starts behaving abnormally.

Figure 4_ Damaged Excavator Hydraulic Pump
Figure 4_ Damaged Excavator Hydraulic Pump

9.  What Causes Excavator Hydraulic Pump Failure?

There are so many factors that cause your excavator hydraulic pump to fail. It can fail prematurely or over time due to normal wearing out of internal components. Check out the frequently observed reasons why your excavator hydraulic pump fails:

1.   Contaminants

Your excavator hydraulic pump is supposed to be completely sealed off to prevent the entrance of contaminants. The most common contaminants are water and air. Water contamination accounts for 90% of the total excavator hydraulic pump failures.

Air contamination is divided into two which cause extensive and severe damages inside your excavator hydraulic pump:

  •  Cavitation – when your excavator hydraulic pump has cavitation, it’ll produce a whining sound. It would be best to handle this issue whenever you hear a whining sound coming from your excavator hydraulic pump.
  •  Aeration – This happens when your excavator hydraulic pump allows external air to enter inside it. Aeration can happen when your excavator hydraulic pump has loose components.

You’ll know that your excavator hydraulic pump has aeration when it starts producing knocking sounds whenever it runs. You’ll need to handle this issue with urgency as it can damage the whole excavator hydraulic pump.

2.   Temperature Issues

Your excavator hydraulic pump may have temperature issues – running too cold or too hot. These temperature problems will undoubtedly cause further problems. Check out the symptoms your excavator hydraulic pump will show you when it faces temperature issues:

  •  Thickening Hydraulic Fluid

You’ve probably been through that science class where you discussed oil viscosity. Low temperatures make oil thicken by increasing its viscosity. When your oil is highly viscous, it may fail to reach your excavator hydraulic pump.

Figure 5_ Thickened Oil
Figure 5_ Thickened Oil

It’s important to let your excavator heat oil up (preferably past 70 degrees) before you start using it. If you do not do this, you may end up damaging your excavator hydraulic pump through cavitation.

  •  Thinning Hydraulic Fluid

Whenever your hydraulic pump works in an environment that is exorbitantly hot, your hydraulic fluid may become too thin. The thin hydraulic fluid prevents lubrication. It further causes leakages, meaning that your excavator hydraulic pump will be running low on hydraulic fluid.

  •  Hydraulic Fluid Oxidation

Oxidation occurs because of extreme heat. This may cause your hydraulic fluid to thicken after oxidizing. This thickening is what causes buildup inside your excavator hydraulic pump. It will definitely make your hydraulic pump overheat whenever it works.

3.   Hydraulic Fluid Quality and Levels

It’s important to ensure that your hydraulic fluid’s quality and quantity (level) is okay. The level of hydraulic fluids can cause severe damages to your hydraulic pump.

For example, low levels of hydraulic fluids bring about air contamination (cavitation). It further causes your hydraulic pump to overheat. When your excavator hydraulic fluid leaks, you’ll experience the same problems.

The quality of your excavator hydraulic pump is also important, as different hydraulic fluids are compatible according to different situations. The quality of hydraulic fluids is also important as it helps you lengthen the service life of your excavator hydraulic pump.

High-quality hydraulic fluids have anti-wear and some anti-foam qualities.

4.   Human Faults

As the saying goes, man is to error. Some failures occur due to this reason. Check out the most frequent areas where human faults have brought excavator hydraulic pump failures:

  • Wrong Maintenance –  you may fail to maintain your excavator hydraulic pump as it should properly. This fault will certainly make your excavator hydraulic pump fail.
  • Using wrong or incompatible spare parts – If a spare part is incompatible, consider contacting a professional company that will supply you with the right part. Using the incorrect part will damage your excavator hydraulic pump.
  • Improper Installation of Components – Your favorite mechanic may install components the wrong way. For example, the mechanic may install the component to spin in the opposite direction. This improper installation will cost you a big deal if you fail to handle it in its initial stages.

Your mechanic may also install hydraulic hoses wrongly by twisting them. Once you twist an excavator hydraulic pump hose and set it at a wrong angle, you reduce that hose’s service life by at least 80%.

Figure 6_ Excavator Hydraulic Pump Proper Hose Fitting
Figure 6_ Excavator Hydraulic Pump Proper Hose Fitting

10.  Why Does My Excavator Hydraulic Pump Leak Oil?

Your excavator hydraulic pump leaks oil because of three primary reasons:

  • Worn-out seals or valves: Whenever you have worn out seals or valves, your excavator hydraulic pump will allow hydraulic fluid to leak. You’ll need to replace the faulty seals to solve this problem.
  • Poor quality of hydraulic fluid – whenever your hydraulic pump works, it heats up the hydraulic fluid. When your oil gets heated up, and it is of poor quality, it’ll become too thin, and it will start leaking. Consider using the right amount and quality of hydraulic fluids.
  • Failing seals because of underlying issues: Your excavator hydraulic pump may leak oil because of failing seals that are caused by an underlying issue. The most frequent cause for failing seals is a misaligned rod. Correcting a misaligned rod is not an entirely complex procedure. A skilled mechanic can do that.

11.  How Can I Troubleshoot My Excavator Hydraulic Pump?

Identifying failures before they are full-blown is necessary. It’s important to know how to troubleshoot your excavator hydraulic pump. Check out how it is done:

  • Check your hydraulic fluids – It’s important to check your hydraulic fluids to maintain your excavator hydraulic pump’s health. You’ll need to check its color, viscosity, and level inside the hydraulic pump. Ensure that it is not contaminated. If you are in doubt of anything, you’ll need to replace the hydraulic fluid.
  • Check the health of your seals, valves, and lines. If they are not okay, you’ll need to replace them.
  • Consider checking the pump by ensuring that all the pump’s components function as they should.
  • Check the excavator hydraulic pump’s motor: The motor should be correctly wired. It should turn on and off easily.
  • Run the system and listen to it – does it produce any noises? If so, consider getting rid of the air that is inside your excavator hydraulic pump.
Figure 7_ Excavator Hydraulic Pump
Figure 7_ Excavator Hydraulic Pump

12.  How Can I Rebuild My Excavator Hydraulic Pump?

Taking apart your excavator hydraulic pump is one thing. Rebuilding it is another.

Here’s the truth:

Rebuilding your excavator hydraulic pump is a complex and delicate process. It would be best if you’d let a skilled and certified professional help you out instead of doing it all on your own.

Here’s why:

Your excavator hydraulic pump is an expensive device. Further, it deals with pressure. In case you fail to install the components properly, it will not work. You’ll have already voided your warranty cover.

13.  How Much Pressure Should My Excavator Hydraulic Pump Produce?

Now, it’s true that:

Different types of excavators produce different amounts of power. This variation in power means that the power produced by their hydraulic pumps is not the same.

Check out this example that illustrates the amount of pressure a standard excavator hydraulic pump should produce:

Your excavator has three hydraulic pumps – two main ones and a third one called the gear pump. Now, your excavator’s two main pumps will supply pressurized oil at 5,000 pounds per square inch (psi).

Your gear pump should pump oil at 700 psi.

It’s important to check the health of your excavator hydraulic pump regularly. Regular checks help you know if your excavator hydraulic pump is still healthy.

14.  What Is The Process Of Replacing My Excavator Hydraulic Pump?

Replacing your hydraulic excavator drive is not an easy process. All excavator repairs and maintenance should be done by licensed professionals only. It’s important for you to refer to your excavator’s manual to understand your excavator hydraulic pump.

Remember, the reason why you are replacing your excavator hydraulic pump is that your initial pump got damaged either by heat, contamination or by cavitation/aeration. You’ll need to check the hydraulic tank cap seals.

The tank cap helps your excavator hydraulic pump to maintain its tank pressure, and it also has to breathe. Damaged seals can cause aeration and cavitation to the hydraulic pump. You’ll also need to replace your suction screen with a new one.

Further, it is important for you to drain your excavator tank when replacing the suction screen. It helps you prevent catastrophic failure. You’ll also replace your hydraulic oil filter to prevent contamination of new oil when you install the new hydraulic pump.

Remember to inspect the drive’s condition.

Before installing your new excavator hydraulic pump, you’ll need to inspect and confirm that all its electrical connectors are intact – for both the excavator and the hydraulic pump. Poor wiring (incorrect setup) causes an electronic system’s failure on your device.

Check for voltage to ensure that everything works out just fine on the electrical end.

Now, you’ll need to use a machine that will help you lift your hydraulic pump from the ground to its allotted spot on the excavator. Excavator hydraulic pumps are heavy (approximately 180kgs).

Once it is in the air, you’ll need to apply an anti-seize to the hydraulic pump’s primary shaft.

It’ll help you have a smooth installation. Then, align your excavator hydraulic pump to where it should be and slide it in. Return all the hydraulic pipes as they were and tighten them to prevent contamination – mainly aeration and entry of water.

To ensure that you have the best results, it would be best to install a cleanup filter. After installing the cleanup filter, run the excavator’s engine for up to four hours (minimum two hours) at 60% RPM.

Warming your hydraulic system helps you prevent the entry of debris in your hydraulic system. Cold hydraulic fluid can allow debris to pass through to your hydraulic system.

Install the suction screen and return everything to how they were before you began the excavator hydraulic pump replacement process. Since there is unwanted air inside the pump, you can get rid of it by bleeding it (air) from your excavator’s highest cap.

For hydraulic pumps that do not have caps, you’ll still need to get rid of the air present in your excavator hydraulic pump. You can do so by cracking the suction elbow at the pump up to when there will be hydraulic fluid leakage.

You’ll need to remember that different regions of the world have different working temperatures. It would be best if you’d consult a skilled professional on the type of oil to use for your excavator hydraulic.

As you warm your excavator hydraulic pump, keep on checking the level of hydraulic oil. The reason why this constant checking is important is that insufficient oil levels bring about the formation of moisture (venting) which eventually leads to rusting.

15.  How Much Does It Cost To Replace My Excavator Hydraulic Pump?

Different makes and models of excavator hydraulic pumps have different excavator hydraulic pump prices. Also, service rates differ from one region to another.

It would be best if you’d contact a reliable company to supply you with your excavator hydraulic pump that meets your budget. You’ll then need to look for a skilled and certified mechanic to install the excavator hydraulic pump.

Our excavator hydraulic pumps are covered with a 90-day warranty period. Failure to reach out to a skilled and certified mechanic voids your warranty.

16.  What Is The Process Of Excavator Hydraulic Pump Coupling?

Your excavator’s hydraulic pump has a coupling device that should be installed between the device itself and the excavator engine. The coupling device enables your excavator to have an additional external force.

It enables the torque generated by the engine on the pump to be equal to the torque the turbine receives, which is then transmitted to your excavator’s driveshaft. There are two primary benefits associated with excavator hydraulic pump coupling:

  • Higher rate of power transmission and enhances durability.
  • Simplified maintenance.

17.  What Is The Process Of Adjusting The Excavator Hydraulic Pump?

Adjusting your excavator hydraulic pump means that you’ll alter the flow of your excavator’s supply of pressurized hydraulic fluid.

It would be best if you’d refer to both your service and operation manual on how you can adjust your excavator hydraulic pump. Remember that improper adjustment of your excavator hydraulic pump makes your device overheat.

You can also contact a reputable and professional company to help you out with the process.

Please note:

For sections that will handle excavator repairs and replacements, please note that this guide should not be considered as a substitute for professional training. KS company shall not be held liable for any damages that may happen to your parts when you try to handle them yourself.

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