Rexroth Gear Pumps troubleshooting

When Rexroth gear pumps are not working properly, it can be difficult to figure out what is wrong with them. This article will offer you advice for how to troubleshoot a Rexroth Gear Pump and get your pump running smoothly again.

Pump does not deliver / suck

Rexroth gear pumps are a reliable and efficient way to move water and oil. However, if the pump does not deliver or suck, there may be a problem with the pump. In this article, we will discuss some common Rexroth gear pump troubleshooting tips.

If your Rexroth gear pump is not delivering or sucking, it is likely that there is something wrong with the pump. In most cases, however, it is possible to fix the problem without having to take the pump apart or replace any parts. Here are some tips for troubleshooting Rexroth gear pumps:

1-Make sure the power is on to the pump.

2-Check for any obstructions in the flow of water or oil. If there are any obstructions, they must be removed before the pump can work properly.

3-Clean all of the components of the pump carefully using a clean solvent or degreaser. Be sure to remove all debris and oils from the parts.

4-Make sure all of the seals on the pump are in good condition and properly lubricated.

Delivery pressure too low

Rexroth gear pumps are reliable and efficient machines that help improve production efficiency. However, if the delivery pressure is too low, the gears can become damaged. In order to troubleshoot this issue, it is important to first identify where the problem is occurring.

If the pressure is low at the pump outlet, then it may be due to a faulty valve or diaphragm. If the pressure is low at the pump inlet, then it may be due to a clogged filter orifice. Once you have identified the problem, you can fix it by replacing the affected component.

Pump is too loud

If you’re experiencing excessive noise from your Rexroth gear pump, it might be time to troubleshoot the issue. Here are some common causes and solutions:

1. Check the circulation system for blockages. If the pump is running constantly but not producing enough pressure to reach desired levels, debris or sediment can accumulate in the circulation path, causing a loud noise. Clear any obstructions from the system using a shop vacuum or air compressor, then check for leaks around fittings and valves.

2. Replace worn components. A noisy gear pump may also be due to worn components, such as bearings or seals. If these components need to be replaced, make sure to do so before purchasing a new pump.

3. Check the oil level. Over time, oil can become dirty and cause a noisy gear pump. Check the oil level regularly and add more if required to maintain sufficient pressure.

Interfaces not tight

Rexroth gear pumps are often used in industrial and commercial settings. When used correctly, these pumps can provide high pressure and flow rates. However, if the interface between the pump and its casing is not tight, water can seep into the pump and cause it to fail.

One common issue with Rexroth gear pumps is that the interface between the casing and pump can become loose over time. This can cause water to seep into the pump and cause it to fail. In order to prevent this from happening, it is important to ensure that the casing and pump interface is as tight as possible. If you notice any signs of water intrusion into your Rexroth gear pump, please contact our team for help. We will be able to troubleshoot the issue and ensure that your pump remains operational.

Pressure peaks over >350 bar from system

Rexroth gear pumps are widely used in industries such as the chemical, oil and gas, food processing, pharmaceuticals and many other industries. The Rexroth gear pumps are known for their high efficiency and durability. However, even the best gear pumps can experience problems if they are not operated correctly.

One common issue that Rexroth gear pumps experience is pressure peaks over > bar from the system. This occurs when the system is overloaded and can cause damage to the pump. To avoid this problem, it is important to monitor the pressure readings throughout the system and take corrective action when needed.

The system interfaces cannot be mounted

Rexroth gear pumps are some of the most popular pumps in the world. They are used in a variety of applications, from agricultural to industrial. However, one common issue with Rexroth gear pumps is that they can be difficult to troubleshoot.

One common issue with Rexroth gear pumps is that they can be difficult to troubleshoot. This is because the system interfaces cannot be mounted. This means that the pump cannot be accessed to diagnose and fix problems. This can make it difficult to get the pump working correctly.

1, it is important to isolate the problem. This means disabling any other equipment that may be affecting the pump.

2, it is important to have accurate measurements. This means using equipment that can measure pressure and flow accurately.

3, it is important to have a good understanding of the pump’s mechanics. This means being able to identify how the pump works and how to fix problems.

Viscosity <10 mm2/s

Rexroth gear pumps are some of the most popular pumps in the market. They are used to transfer fluid from one location to another. Rexroth gear pumps come in a variety of sizes and capacities, making them perfect for a variety of applications.

One common problem that users experience with Rexroth gear pumps is viscosity < mm/s. This means that the flow of fluid through the pump is too slow or too fast. If this problem is not addressed, it can lead to major problems.

To diagnose and fix viscosity < mm/s issues with Rexroth gear pumps, experts recommend using a variety of diagnostic tools. These tools include flow meters, pressure gauges, and differential pressure gauges.

Once the problem has been diagnosed, experts recommend using corrective measures to speed up the flow of fluid through the pump. These measures may include adjusting valves, changing motor sizes, or replacing parts.

Viscosity >300 mm2/s

There are several types of Rexroth gear pumps, including reciprocating and rotary gear pumps. Reciprocating gear pumps use pistons to move the fluid material. Rotary gear pumps use a set of rotating gears to move the fluid material.

Gear pumps can be divided into two categories based on their operating principle: positive displacement and displacement pumping. Positive displacement gear pumps use expansion chambers to increase the pressure inside the pump. Displacement pumping gear pumps use a chamber that decreases the pressure inside the pump.

Gear pumps can also be classified based on their stroke: short stroke, medium stroke, and long stroke. Short strokegear pumps have a shorter stroke than medium and long strokegear pumps. This allows them to pump more fluid per cycle than other types of gear pumps.

Volumetric or mechanical efficiency is not achieved

Volumetric efficiency is not achieved when using Rexroth gear pumps. One reason for this is the fact that the mechanical efficiency is determined by the number of strokes per minute (spm) and the volumetric efficiency is determined by the actual displacement. When using gear pumps, it is important to ensure that both of these factors are taken into account.

Admissible level of contamination of the hydraulic fluid has been exceeded

Rexroth Gear Pumps are used to circulate hydraulic fluid in a variety of industrial and commercial applications,If a hydraulic fluid leaks or if the quality of the hydraulic fluid is questionable, the allowable level of contamination has been exceeded.

In order to avoid any potential problems and ensure an optimum performance from your Rexroth Gear Pump, it is important to check the level of contamination present in the hydraulic fluid. The following guide will outline the procedure for checking the admissible level of contamination.

1. Remove all debris and other foreign objects from around the gear pump using a suitable brush or vacuum cleaner.

2. Inspect the gear pump housing for signs of leakage or damage. If there are any indications of leakage, replace the gear pump housing immediately.

3. Inspect the hydraulic fluid for signs of contamination. If there is any evidence of contamination, replace the hydraulic fluid immediately.

Wrong direction of rotation of the drive motor

Rexroth gear pumps are commonly used in agricultural and industrial applications. The drive motors typically rotate in a clockwise direction, but this can be changed with the proper tool. If the motor is rotating in the wrong direction, there may be damage to the pump or components. In most cases, reversing the rotation of the motor will fix the issue.

Protective motor switch is activated

If the protective motor switch is activated, this means that there is a problem with the pump. If you have worked on the pump before and know how it should work, then you can check to see if there is something blocking the switch. If the switch is clear, then you may need to replace the motor. Check the motor for any signs of overheating. The motor is located on the back of the pump, with the wires connected to it through a metal sleeve. Any signs of overheating should be replaced.

Input speed too high/too low

If the input speed is too high, then the pump may be overloading and not able to keep up with the demand. If the input speed is too low, then the pump may not be able to get enough air or fluid moving through it to meet the demand.

Air inlet through the output side

If the air inlet is not flowing through the output side of the Rexroth gear pump, check the following:
-Make sure that the Venturi tube is inserted into the output side of the pump correctly and that it is connected to the intake side of the pump.

1-Check that all air valves are closed.

2-Check that the suction tube is securely attached to the pump.

3-Check that the suction and discharge tubes are securely attached to the pump.

4-Check that the air inlet tube is rigidly connected to the air valve on the input side of the pump.

Fluid leakage

When a gear pump fails, it is important to troubleshoot the failure and determine the cause. Rexroth offers a variety of gear pumps for various applications, so understanding their use and how they work can help in troubleshooting.

One common problem with gear pumps is fluid leakage. This can happen when seals or gaskets fail, allowing oil or water to enter the pump and cause damage. To identify fluid leakage, you first need to inspect the pump for signs of damage. Look for oil leaks, wet spots on the motor mountings or casing, and cracks in the housing. If you see any of these signs of damage, replace the seal or gasket as soon as possible.

If you don’t see any signs of damage, another possibility is that the pump has failed due to low oil pressure. To check oil pressure, use a gauge or dipstick to measure the level at the engine block. If it’s low, replace the O-ring or piston ring. If that doesn’t solve the problem, check for clogs in the oil line by using a snake or manual vacuum cleaner. If all of these solutions don’t work, then your gear pump may be broken and needs to be replaced.

Output flow is not achieved

If the output flow is not achieved, it is possible that the pump has a problem. The following are some tips on how to troubleshoot the issue:

1. Make sure that the pump is properly installed. Check that it is connected to the correct system and that the power is turned on.

2. Check the power supply connections. Make sure that they are secure and properly placed in relation to the pump.

3. Inspect the pump for damage or malfunctioning parts. If necessary, replace defective parts or repair any damage that has occurred.

4. Check the pump’s operating parameters. Try adjusting them to see if this resolves the issue.

Permanent output pressure >315bar

Rexroth gear pumps are used in a variety of industries to remove liquids and gases from tanks, pipelines and other containers.

If you’re having trouble with your Rexroth gear pump, there are a few things you can do to troubleshoot the problem. First, check the output pressure. Make sure the pump is generating enough pressure to operate properly. If the output pressure is low, you may need to replace the pump or adjust the setpoint.

If the output pressure is high, you may have a faulty diaphragm or seal. In this case, you’ll need to replace the pump. Alternatively, you can try adjusting the setpoint to lower the output pressure. If that doesn’t work, you may have to replace the entire pump.

Wear caused by radial force on the shaft

Rexroth gear pumps have radial forces on the shaft that can cause wear. If this wear is significant, it can lead to pump failure. Here are some tips for troubleshooting this issue:

1. Check for excessive wear on the gears and shaft.

2. Inspect for any evidence of foreign material or debris on the gears or shaft.

3. Check for tight tolerances on the gears and shafts. If these are not within acceptable tolerances, they may need to be replaced.

Wear caused by axial thrust on the shaft

Rexroth Gear Pumps are subjected to axial thrust on the shaft, which can cause wear. The most common type of wear is caused by the teeth on the cam causing rubbing against each other. This can lead to a build-up of material on the cam, which will eventually cause it to break. In order to prevent this from happening, it is important to keep an eye on the wear level and replace the cam as necessary.

Pump wear

Rexroth gear pumps are renowned for their durability and longevity, but like any other mechanical device, they can wear out over time. In this article, we’ll discuss some common pump wear issues and how to troubleshoot them.

The most common causes of pump wear are incorrect assembly or installation, incorrect fluid usage, and corrosion. To prevent wear, always follow the Rexroth pump installation instructions carefully. Make sure the fluid you’re using is compatible with the pump and that the system is properly assembled and sealed. Finally, be sure to regularly clean and inspect the pump for signs of corrosion. If you notice any signs of wear or damage, contact Rexroth for replacement or repairs.

Troubleshooting Form

Malfunction	Possible cause	Remedy
Pump does not deliver / suck	The pump is not bled	Bleed the pump
	O-rings defective (wrong medium, damage to  Install/replace with original O-ring the sealing, missing O-ring, wrong O-ring)
	Sealing surfaces contaminated or damaged    Ensure cleanness and integrity of the sealing surface
	Coupling is missing and/or parts of the coupling are missing	Amend the coupling or coupling component
	See malfunction “Wrong direction of rotation of the drive motor”
	See malfunction “Air inlet through the output side”
	See malfunction “Back pump is blocked”
	See malfunction “Back elements exceed maximum torque”
Delivery pressure too low	See malfunction “Inlet pressure <0.6bar”
	See malfunction “Admissible level of contamination exceeded”
	See malfunction “Output flow is not achieved”
Pump is too loud	See malfunction “Interfaces not tight”
	See malfunction “Wrong direction of rotation of the drive motor”
	Ambient temperature is below –20°C	Provide for suitable ambient temperatures
	Aspiration of air bubbles	Bleed the system
	Vortex generation in the suction area of the fluid tank	Check the filling level of the fluid tank
	See malfunction “Viscosity <10 mm2/s”
	See malfunction “Viscosity >300 mm2/s”
Interfaces not tight	O-rings defective (wrong medium, damage to  Use original O-ring the sealing, missing O-ring, wrong O-ring)
	Sealing surfaces contaminated or damaged    Ensure cleanness and integrity of the sealing surface
	Incorrect assembly (screws too long)	Assembly only by authorized, trained and instructed qualified personnel; only use original spare parts
	Combination part is not suitable	Observe the project planning information in RE 10227
Pressure peaks over >350 bar from system	Feedback from hydraulic system	In the project planning, observe the admissible pressure peak in RE 10227
		Integrate pressure control valves
The system interfaces cannot be mounted	Wrong connection flanges/screws suction port and/or pressure connection selected	Observe the flange dimensioning in RE 10227
Viscosity <10 mm2/s	Hydraulic fluid too hot	Information on hydraulic fluids in RE 90220; observe the project planning information in RE 10227; check the water content, viscosity, turbidity and smell on a regular basis
	Shelf life of the hydraulic fluid is exceeded
	Wrong hydraulic fluid filled in
Viscosity >300 mm2/s	Fluid temperature too low	Information on hydraulic fluids in RE 90220; observe the project planning information in RE 10227; check the water content, viscosity, turbidity and smell on a regular basis
	Wrong hydraulic fluid filled in
	Thickening due to mixing
Volumetric or mechanical efficiency is not achieved	See malfunction “Viscosity >300 mm2/s”
	See malfunction “Viscosity <10 mm2/s”
	See malfunction “Output flow is not achieved”
	Operation projected with too low and/or too high speed	Observe the project planning information in RE 10227
	See malfunction “Admissible level of contamination of the hydraulic fluid exceeded”
	Mixing of different fluids	Observe the information on hydraulic fluids in RE 90220
Admissible level of contamination of the hydraulic fluid has been exceeded	Fluid aging and abrasion from system	Check the fluid contamination according to the maintenance schedule
	Insufficient filtration	Observe the project planning information in RE 10227 and check according to maintenance schedule
	Unexpected inlet of contamination (e.g. in case of fluid exchange)	Provide for a clean environment, filling only via filter
Wrong direction of rotation of the drive motor	Drive motor corrected incorrectly	Assembling only by authorized, trained and instructed experts
		Check the direction of rotation in case of re- commissioning after mains separation
Protective motor switch is activated	Drive motor too weak	Observe the information on the required drive power in RE 10227
	See malfunction “Wrong connection of the drive motor”
	See malfunction “Pump wear”
Input speed too high/too low	Motor projected with too low and/or too high speed	Observe the project planning information in RE 10227
Air inlet through the output side	O-rings defective (wrong medium, damage to the sealing, missing O-ring, wrong O-ring)	Use the original combination part set, replace the seals
Fluid leakage	Tank hangs too high	Observe the project planning information in maintenance and commissioning of hydraulic components RE 07800 / RE 07900
	Fluid level too high
	Pre-charged fluid tank (too high pressurized) and/or pre-filling pump	Observe the project planning information for pre-charged tank and/or pre-filling pump
	Defective seal	Exchange the damaged O-ring
	See malfunction “Interfaces not tight”
Inlet pressure <0.6bar	Faulty dimensioning of the suction line (length, cross-sections, angle)	Observe the project planning information in RE 10227
	Speed too high	In the project planning, observe the maximum speed
	Foreign body in the suction channel	Remove the foreign body
	Air pressure too low                                      In the project planning, observe the absolute (also tank without pressure compensation)      pressure
Inlet pressure >2bar	See malfunction “Fluid leakage”
Output flow is not achieved	Pump sucks in air	Check the level in the fluid tank and correct it, if necessary Observe the information on the design of the lines in hydraulic trainer, volume 3 and project planning information
	Input speed too low	In the project planning, observe the characteristic curve average values drive power in RE 10227
	See malfunction “Admissible level of contamination of the hydraulic fluid exceeded”
	See malfunction “Pump wear”
Permanent output pressure >315bar	Line cross-section too little	Observe the information on the design of the lines in hydraulic trainer, volume 3 and project planning information
	Flow resistances too high
	Admissible load exceeded	For limiting the operating pressure and for the solenoid-actuated discharging of the operating pressure, install a pump safety block. In doing so, observe the information in RE 10227
Wear caused by radial force on the shaft	Incorrect installation	Observe the installation information
	Unsuitable parts	use only an original combination part set
	Tightening torque for the screws is too low	Observe the tightening torques in the installation information
	See malfunction “Pump wear”
Wear caused by axial thrust on the shaft	Incorrect installation	Observe the installation information of the coupling manufacturer
	Unsuitable parts	use only an original combination part set
	See malfunction “Pump wear”
Pump wear	Contaminated or wrong operating medium	Filter or exchange the operating medium, perform regular controls.

Summarize

Rexroth gear pumps are one of the most popular types of pumps used in industry. When they encounter trouble, troubleshooting can be difficult. This blog section will provide a step-by-step guide for troubleshooting Rexroth gear pumps.

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