Hydraulic pumps, central components of mechanism system, sometimes fail to work similar to any other components and this will cause downtown for your company. Therefore, repairing the hydraulic pumps quickly is the top priority for you to minimize the cost during downtown. In this article, we will introduce you to check and repair your hydraulic pumps step by step.

Table of Contents

Why Does A Hydraulic Pump Fail to Work？

Hydraulic pumps are easy to be damaged by wear,containment, leakage and other reasons. Before you take action to repair hydraulic pumps, understanding the some common failures are very important and necessary because this kind of knowledge are helpful to the following repairing step. Usually, the failures of hydraulic pumps are as follows.

Fluid containment

Fluid containment of hydraulic pumps are usually caused by dust, dirt, debris or water mixed with hydraulic oil and this containment will seriously influence the quality of hydraulic oil. Thus, the service lifespan of hydraulic pumps will be shortened severely.

Besides the external containment of hydraulic fluid, there also exists internal containment of hydraulic oil. The internal containment usually caused by burrs or machining debris which are detached from manufacturing process of hydraulic pumps.

To sum up, all kinds of fluid containment will reduce the functionality and working performance of hydraulic pumps. Therefore, to solve the problem fluid containment, the following suggestions are necessary:

Ensure hydraulic oil is free from contaminants
Carry out regular maintenance inspections of hydraulic pumps
Replace hydraulic filters based on working performance
Make sure the inlet filter is not obstructed and is in good working condition

Cavitation

Cavitation is another common problem that can cause great damage to hydraulic pumps. It usually occurs when the pressure of hydraulic fluid is too low and then several vapor bubbles appear. If these vapor bubbles collapse suddenly, strong shock waves will cause serious impact to the finish of hydraulic pumps and make the surface abrasive and rough.

To solve or reduce the negative impact caused by cavitation, useful suggestions are as follows:

Keep the hydraulic fluid level stable
Keep the hydraulic fluid flow smoothly
Keep the hydraulic fluid pressure appropriate

Excessive temperature

The long-time operation of hydraulic pumps usually make pumps’ temperature excessive. If hydraulic pumps with higher temperature, it will speed up the wear process, make hydraulic oil degrade, damage the component pf seal and reduce the efficacy of hydraulic pumps.

Usually, the reasons of excessive temperature are as follows:

Insufficient hydraulic fluid in the reservoir
Poor airflow to/from the hydraulic reservoir
Blocked heat exchanger
Internal hydraulic fluid leak
Cavitation

Due to the serious outcomes of excessive temperature, strict monitor of temperature and the cold system can help you maintain the temperature in proper range.

Fluid leakage

Whether the damage of hydraulic connections or the failure of seal components, they both have the potential ability to cause the hydraulic fluid leakage and make hydraulic pumps crushed.

If you have identified the fluid leakage point, please use the original equipment manufacturer parts to replace the old ones.

Steps to Repair A Hydraulic Pump

Although hydraulic pumps do exist different types and various failures, there are many common points when it comes to repair a hydraulic pump. What’s more, repairing hydraulic pumps require high familiarity to every components, useful and professional repairing tools and clean working space.

If you are disturbed by the failure of hydraulic pumps and want to repair your products, please follow the steps below:

Step 1: Identify the failure

The first step you should do is to check carefully whether the hydraulic pumps have obvious symptoms such as pressure loss, abnormal noise, fluid leak or visible cracks on surface.

Besides, using tools to measure the pressure or flow rate of hydraulic oil is also necessary action to find potential internal problems.

Step 2: Shut down the system

Before you carry out any repairing actions, please remember to:

Shut down thewhole hydraulic system
Discharge all the accumulating pressure
Make sure the whole machine is out of power

Step 3: Disassemble the whole hydraulic pumps and identify the place of abrasion

In this step, you begin to disassemble the pumps carefully. In the process of disassembling the components of hydraulic pumps, you should pay attention to every parts of pumps in order to reassemble when you finish your repairing.

Ensure that you have useful and appropriate tools in hand to help you disassemble. One tip to find the abrasive part is that high-friction areas may be more shiny than any other places and more often occur abrasive finish.

Step 4: Check the fluid leakage

The fluid leakage often appears in the connections, fitting and seal components, so these parts should be paid more attention in order to find the leakage points. If you find the leakage appears in any part we mentioned above, please change the components at once and ensure the components you change are original equipment manufacturer parts.

Step 5: Cleanse the hydraulic system

To solve the fluid containment of hydraulic pumps, you should use specific detergent to clean all the part of pumps and thoroughly clean the hydraulic system. After cleaning, you should add new clean hydraulic oil and filter.

And remember that all the components you cleaned should be dry before you reassemble the hydraulic pumps.

Step 6: Replace the filter

In this step, you should check whether the filter is blocked or contained. If so, please clean the filter thoroughly or change it to ensure the smooth fluid flow.

Step 7: Avoid cavitation

This step aims to identify all the possible reasons that may cause the situation of cavitation such as blocked system, insufficient fluid or low pressure.

Step 8: Monitor the temperature

Regular monitoring of hydraulic pumps is necessary action to avoid problems caused by excessive temperature. If you find the temperature is over the normal temperature range, please equip and operate the cold system to maintain the operating temperature stable.

Step 9: Reassemble the hydraulic pumps

After solving all the problems of hydraulic pumps, reassemble all the parts and then operate the pumps several time to ensure that the hydraulic pumps can work smoothly.

Step 10: Ask professional experts for help

During the process of your repairing procedures, if you find the problem is too complex for to solve, please contact the professional experts of hydraulic pumps to avoid the further damage.

Conclusion

Hydraulic pumps can be divided into several types and the failure of hydraulic pumps are quite complex. This makes repairing a hydraulic become a challenge for most nonprofessional people. Our factory has many experts who are familiar with all the parts of hydraulic pumps. Therefore, if you need help in repairing hydraulic pumps, don’t hesitate to contact us!