hydraulic gear pump troubleshooting

hydraulic gear pump troubleshooting

hydraulic gear pump systems are an essential item in any commercial or industrial environment. They allow you to have a working pump, along with less downtime and better efficiency when they are taken care of correctly. Make sure you consult this article if your gear pump is giving you too much trouble!

hydraulic gear pump

NPSHa Not Sufficient

The hydraulic gear pump is a source of power for many devices in the automotive and industrial engines. The NPSHa is the National Pump Service Advisory, which provides guidance to help prevent pump failures.


Most common hydraulic gear pump problems include:

1-Sufficient NPSHa – If the NPSHa is not sufficient, the pump will not be able to operate at full capacity. This can lead to reduced efficiency, reduced performance, and even failure.

2-Low NPSHa – If the NPSHa is low, the pump will not be able to transfer enough power from the engine to the gears. This can cause increased wear on gears and other components, and may eventually lead to failure.

3-Bad Valves – Bad valves can reduce the efficiency of the gear pumps, leading to decreased performance and even breakdown. It is important to inspect all valves on a gear pump if there are any signs of wear or damage.

Air Leaks Into Hydraulic Gear Pump

Hydraulic gear pumps are amazing machines, able to move a significant amount of fluid for a long time with very little noise. However, they can also be temperamental, and in some cases may not work at all. In this blog post, we’ll discuss some of the common problems that hydraulic gear pump owners may encounter, and how to fix them.

There are many components of the gear pump that can fail.  In particular, we’re going to look at failed oil seals, insulators and gaskets.  Oil seals are very common failures in hydraulic gear pumps, which is why they usually have a black rubber cap on them.  As the lubricant levels drop or pressurized gas enters the pump because of leakage, the less effective these seals get. Insulators clear out easily as well due to imperfections in the piping attached to a hydraulic hose.  By now most people are familiar with this problem, as hydraulic fluid leaks from hoses on every part of their motorized ride.

Air Leaks Into Hydraulic Gear Pump
Air Leaks Into Hydraulic Gear Pump

The knock offs for failure of insulators were:

1) Buried force going through seal to be released.

2) Trapped debris in seal.  This one seems to explain a lot if you pull off your front cowl, but doesn’t seem to happen much on karts.

3) Obstruction between seal and lifter cup caused by carbon buildup or other damage.

4) Overloaded bearing/piston not aligned/broken rings = oil coming out of bearings = no flow through seals. Gasket failures will cause hydraulic leaks too (maybe because lubricant is forced up a longer pipe which normally just carries air?).

Hydraulic Gear Pump Has Run Dry

A hydraulic gear pump can help conserve energy by transferring power from a rotating engine to a rotating equipment shaft. When the pump is working correctly, it will transfer enough power to keep the equipment running smoothly. However, if the pump fails, it may not be able to transfer enough power to keep the equipment running. This can lead to the gear pump running dry, which can cause serious problems.

There are a few methods you can use to troubleshoot a hydraulic gear pump that has run dry.

1, you can check the fluid level and level of contaminants in the gear pump reservoir. If there is no fluid or contamination present in the reservoir, then the gear pump may be bad. You can also test the gear pump by turning on the power to the equipment it is supposed to transfer power to and watching the output speed. If the output speed decreases over time, then the gear pump may be bad.

2, you can remove the gear pump and check for any damage or foreign objects inside of it. If any damage or objects are found, then your gear pump may be bad and needs to be replaced.If you are unable to determine what is causing your gear pump to run dry, then you may need to replace it.

Liquid Temperature Higher Than Expected

Hydraulic gear pumps are often used to move liquid around a system. Because the pumps have so much torque, it is important that they work correctly and in accordance with the temperature of the liquid they are moving. However, sometimes liquid temperatures can be higher than expected and this can lead to problems with the pump. In this post, we will explore some of the common hydraulic gear pump problems and how to troubleshoot them.

1) Heat Exchanger failures: One common issue with hydraulic gear pumps is that the heat exchanger can fail. This occurs when the heat exchanger cannot transfer enough heat from the liquid to the engine. The result is excess heat build-up in the system, which can eventually cause the pump to fail. To test for a failing heat exchanger, it is necessary to use a thermal imaging camera. If the image shows hot spots near or on the heat exchanger, it most likely means that repairs are needed.

2) Blowby: Another common issue with hydraulic gear pumps is blowby. Blowby occurs when air bubbles form in the fluid inside of the pump due to high pressure or incorrect fluid composition. This can cause significant damage to both the pump and system components (either on the pump itself, or other components). Once the system loses pressure, it can depend on another type of pump to take over in order to keep the system operating properly.

Viscosity Higher Than Expected

If your hydraulic gear pump is outputting excessive viscosity, it may be due to one of two issues. The first possibility is that the fluid being pushed through the pump is contaminated with something that is causing increased friction and thus increased viscosity. This type of issue can often be easily remedied by using a cleaner or by adding oil to the system. The second possibility is that the pump itself is not functioning properly. If this is the case, it may necessitate a replacement of the pump assembly. In either case, it is important to consult with a specialist in order to correctly diagnose and fix the issue.

One of the most common ways that pumps can fail is if the fluid being pumped experiences a rise in temperature. When this happens, it may cause the pump material to swell, causing the plastic impellers to lose size and causing them to jam.

Additionally, because pumps are always pumping in one direction, there is a risk that if the fluid level rises enough to enter contact with the bearings at their outer edge, they can be damaged on either side by sudden elevation of temperature around them particularly when Pump Servo Actuators are used integrating mechanical drive and PFC drive.

Hydraulic Gear Pump Running Too Fast

If you’re noticing that your hydraulic gear pump is running too fast, or if it’s suddenly stopped working, there are a few things you can do to try and diagnose the problem and fix it.

1. Check the impeller – If the impeller is turning too quickly, it could be due to a problem with the gear pump itself. In this case, it may be necessary to replace the entire gear pump.

2. Check the spring – If the spring isn’t firing correctly, it could be due to a worn or torn spring. In this case, it may be necessary to replace the entire gear pump.

3. Inspect the seals – If there are any leaks or problems with the seals, they could be causing the gear pump to overheat and fail. In this case, it may be necessary to replace both the seal and the gear pump.

4. Clean and lubricate – If the gear pump is not failing due to dirt and corrosion, it may be that the gears and corners are worn out or misaligned. In this case, grinding bench scrapers or possibly a small file could be used on the gears to correct these issues.

Abrasives Incorrect Rotation Incorrect Head Place

Hydraulic gear pumps are an integral part of a variety of industrial processes. In most cases, these pumps run perfectly smoothly and generate negligible noise. However, there are times when something goes wrong with the pump, resulting in poor performance or even complete failure.

If you’re encountering problems with your hydraulic gear pump, there are a few things you can do to troubleshoot the issue. First, review the manufacturer’s instructions to ensure that you’re following them correctly. If the instructions don’t address your issue, try replacing any parts that seem to be malfunctioning. If those fixes don’t work, consult a professional engineer or technician for help.

Abrasives Incorrect Rotation: If the gear pump is not rotating the correct direction, check to see if the gears are meshed correctly and that the pump head is placed on the center of the gear train. In addition, make sure all screws and bolts that secure the head to the gear train are tight. Check for foreign objects lodged in the gears or pump head. Incorrect Head Place: If the gear pump is not rotated or is rotating in the wrong direction, it may be due to incorrect placement of the pump head on the gear train. To ensure proper rotation of the gear pump, ensure that it is placed on the center of the gear train and that all screws and bolts securing it to the gear train are tight. Additionally, make sure there are no foreign objects blocking gears or debris buildup in ducts near gears could cause improper rotation.

Wrong ClearanceWorn Internals

Hydraulic gear pump clearances can be critical to the proper operation of the pump. If clearance is incorrect, internal defects will cause premature failure. Here are a few tips for detecting and correcting clearance problems:

Wrong ClearanceWorn Internals

1. Inspect the pump for wear and tear, especially around the shaft and impeller. A worn pump will have reduced clearances, which can lead to poor performance and even failure.

2. Check the impeller lofting, or how high the impeller is off of the stator, to ensure it is within normal limits. Improper lofting can cause an imbalance in the torque that the pump generates, which can lead to problems such as excessive noise or vibration.

3. Inspect ports and flanges on the body of the pump for signs of obstruction or damage. If there are any obstructions, they must be removed before continuing inspection. Damaged ports or flanges can reduce flow rates, causing problems such as improper gear selection or decreased pumping capacity.

4. Inspect openings such as electrical conduit penetrations or mechanical struts for evidence of excessive blows, fluid entrapment, defects, loose nuts and bolts, and signs of damage that could reduce the pumping capacity of the system. A blast-shield faired assembly is not considered part of the actual impeller. This can be a defect or improper assembly.

Visually inspect warranty card and all parts attached to pump before replacement; Inspect impellers visually from several angles to detect protruding pieces that are damaged. If any major defects are found, go on next step.

Tight Packing Gland

If you are experiencing problems with your gear pump, it is important to troubleshoot the issue before replacing the pump. Here are some tips to help you identify and solve common gear pump problems.

1. Inspect the packing gland. This is a seal that keeps the gear pump impeller from hitting the output shaft. If it is failing, water can enter the pump and cause serious damage. Check to see if there are any leaks around the packing gland or if it is damaged in any way. If there is a leak, replace the packing gland.

2. Check for obstructions in the impeller flow path. This can be caused by clogs or debris in the pipe or by worn seals in the gear pump impeller. Remove any obstructions and clean the area of any debris with soap and water.replace seals as needed.

3. Check for Gears that are not meshing properly. Gear pumps are mechanical devices and over time they will start to wear out, eventually causing them to stop working altogether due to misalignment of gears. If you notice misaligned gears, you will need to replace the whole gear Pump assembly

Hydraulic gear pumps incorporate a number of design features to improve their reliability and performance, including closed hydraulic systems that minimize the risk of air or liquid infiltration into the pump. However, despite these precautions, gear pumps can fail due to packing gland failure. In this article, we will discuss the causes and solutions for tight packing gland failures in hydraulic gear pumps.

Internal gear pumps PGH-2X

Rexroth Internal Gear Pumps

The pumps are available in several different sizes and models, making them suitable for a range of different applications. Topkitparts offers a wide range of internal gear pumps that can be used for either low or high pressures.

Improper Seal Installation

Improper Seal Installation can Cause Gear Pump Problems. Inadequate or improperly installed seals can allow hydraulic fluid to leak and contaminate your gear pump. This can be a costly and time-consuming problem to solve, so it’s important to be familiar with the common causes of gear pump seal failure.

Here are four tips for inspecting and repairing seals on your gear pump:

1) Inspect the seals for foreign material, wear, or leakage. Remove any deteriorated or damaged seals, and replace them with new ones if necessary.

2) Check the physical condition of the gears and shafts. Are they properly lubricated? Are wear or tear patterns consistent with normal operation?

3) Inspect the installation of the seals. Are they seated properly on the gears? Are there any gaps between the seal and gear? Is there debris or grease in the seal gap?

4) Test the gear pump using a limited amount of hydraulic fluid. If leaks are detected, inspect the installation for damage and replace seals as necessary.

Relief Hydraulic Gear Pump Valve Setting

If you experience problems with your hydraulic gear pump, it’s important to first check the relief valve setting. This is typically located on the side of the motor and allows excess pressurized fluid to escape in an emergency. If the relief valve is not set correctly, you may experience failiures with your hydraulic system. Follow these steps to check and adjust the valve:

1. Turn off power to the pump using the main switch.

2. Remove the cover from the relief valve by unscrewing the two screws securing it to the side of the motor.

3. Use a flathead screwdriver to turn the relief valve handle until it clicks in place. Make sure that it is properly tight against the motor so that fluid cannot leak out.

4. Reconnect power to the pump and wait 30 seconds before starting it up again.

5. Check that fluid is flowing freely through the relief valve and turn handle if necessary until it clicks into place. If there are no leaks, Congratulations!

Relief Hydraulic Gear Pump Valve Reversed

When a hydraulic gear pump reaches its optimum operating point, it will automatically shut off due to pressure buildup within the system. If the valve controlling the relief gear pump is reversed, the pump will resume operating until pressure builds up once again and shuts off. To prevent this from happening in the first place, heed these tips for troubleshooting a reversed valve:

Relief Hydraulic Gear Pump Valve Reversed

1- Check for proper installation of relief valve. If it is installed backwards, it will cause pressure to build up and the pump will shut off. Make sure the valve is installed properly in relation to other valves on the system and that its port size is compatible with the pump’s discharge port.

2- Verify that all connections between valves and pumps are secure. Loose connections can lead to reversed valves, as well as pressure buildup in the system.

3- Inspect all hoses for damage or kinkage. Hoses can become kinked if they are pulled through tight spaces or displaced during transport. Damaged hoses can also cause pressure buildup and a stopped pump.

Material Corrosion

If you experience material corrosion on the blades or gears of your hydraulic gear pump, you should take action to prevent it from happening. By following these tips, you can keep your equipment running smoothly and prevent costly repairs down the line.

1. Regularly inspect the gear pump for signs of material corrosion. Check for rust spots, divots, and flakes appearing on the blades or gears. If you find any of these indicators of corrosion, take action to address them ASAP.

2. Always use a corrosion-resistant lubricant on the gear pump blades and gears. This will help protect them from damaging moisture and salt damage.

3. Keep the gear pump area clean and free of debris. This will help reduce the amount of corrosive chemicals that can reach the blades or gears.

4. Take regular quality checks on all hydraulic gear pumps in your fleet to ensure they are running efficiently and without issues.

Drive Problems

There are a few things that can cause your hydraulic gear pump to not work. The most common problem is a loose connection between the drive and the pump assembly. In order to troubleshoot this issue, you will want to take the following steps:

1. Check the connection between the drive and the pump assembly by trying to move one piece without the other. If it’s loose, you will need to tighten it up using a wrench.

2. Make sure that all of the fluid hoses have not been disconnected or cut. If they have, you will need to replace them.

3. Check for broken pieces inside of the pump by putting your hand around it and feeling for any breaks in the casing or blades. If there are any, you will need to replace them.

4. Finally, check to see if there is anything blocking the flow of fluid through the pump by taking off the cover and looking inside. If there is something blocking the ports, you will need to clean them out using an appropriate solvent or brush cleaner before reinstalling the cover.

Bosch Rexroth External Gear Pumps

Rexroth external gear pumps are built in four frame sizes: Platform B, F, N and G. Within each platform different sizes can be realized by different gear widths. The pumps are available in the versions Standard, High-Performance, SILENCE und SILENCE PLUS. Further configuration variants are given by different flanges, shafts, valve arrangements and multiple pump combinations.

Vacuum and Pressure Gauges

This blog entry will cover some of the common hydraulic gear pump troubleshooting issues and how to properly address them. A hydraulic gear pump is an important part of any machine or system that utilizes fluid power, and when it malfunctions, can cause a lot of trouble. Here are some tips on troubleshooting hydraulic gear pumps:

Vacuum and Pressure Gauges

1. Check the oil level – One of the first things to check is the oil level. Make sure there is enough oil in the system to lubricate the gears and bearings. If the oil level is too low, it can lead to malfunctions and shortened lifespans for the pump.

2. Check for blockages – Make sure there are no blockages in the system that could be causing the malfunction. This includes checking for clogged filters, valves, lines, and other components.

3. Check for wear and tear – Periodic inspection of all components will help identify any damage that may be due to wear and tear. This can include checking for worn seals, missing parts, or damage from corrosion.

4. Check electrical connections – Sometimes problems with hydraulic gear pumps can be traced back to bad electrical connections. Make sure all connections are tight and cleanable before using the gear pump again.

5. Check fluid level – Small leaks can cause problems with the life expectancy of gear pumps, even if the pump is not actually malfunctioning. Checking for oil in sight ports and the condition of small components under pressure will often reveal small leaks that can be fixed before drilling damaging holes throughout a project or simply purchasing new equipment.

6. Timely maintenance – If a problem does occur that causes great wear, it may take time and patience to deal with it properly, but failure to deal with such issues far more rapidly could result in very expensive gear pump repairs for locations on the job site.

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