How to troubleshoot the gear pump

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How to troubleshoot gear pumps

gear pumps are generally used in engineering machinery with unclean working environment, general machine tools with low accuracy, and hydraulic systems with low pressure and large flow

advantages of gear pump:

1) simple structure, good processability and low cost

2) compared with other pumps with the same flow, it has compact structure and small volume

3) good self-priming performance. It can reliably realize self-priming at high and low speeds and even under manual conditions

4) large speed range. Because the transmission part and gear of the pump are basically balanced, large inertia force will not be generated at high speed

5) the dirt in the oil does not seriously affect its work and is not easy to bite

disadvantages of gear pump:

1) low working pressure. The pressure on the gear, shaft and bearing of the gear pump is unbalanced, and the radial load is large, which limits the increase of its pressure. Gear pump is mainly used in medium and low pressure system

2) low volumetric efficiency. This is due to the large end leakage of the gear pump

3) large flow pulsation causes large pressure pulsation, causing vibration and noise of pipes, valves, etc

causes and troubleshooting of common faults of gear pump

causes and troubleshooting of fault phenomena

no oil pumping or insufficient oil delivery and low pressure 1. motor steering error 2. Suction pipe or oil filter blockage 3. Axial clearance or radial clearance is too large 4. Air is mixed due to leakage at each connection 5. Oil viscosity is too large or oil temperature rise is too high

1. correct motor steering 2. Dredge pipeline, Clean the oil filter, remove the blockage, and replace with new oil. 3. Repair and replace relevant parts. 4. Tighten the screws at each connection to avoid leakage and prevent air from mixing. 5. The oil should be selected according to the temperature rise change

severe noise and pressure fluctuation. 1. The oil suction pipe and oil filter are partially blocked or the capacity of the inlet oil filter is small. 2. Suck air from the suction pipe or shaft seal, Or there are bubbles in the sharp contrast between the oilstone textured engineering plastic and the mild cloth surface. 3. The pump and the coupling are not concentric or scratched. 4. The accuracy of the gear body has not been high since this day. 5. The CB gear oil pump framework oil seal was damaged more than a year ago or the spring in the framework oil seal fell off during shaft installation. 1. Remove dirt and make the oil suction pipe unblocked, or use an oil filter with appropriate capacity. 2. Add some oil at the connection or seal. If the noise is reduced, Screw the joint or replace the sealing ring. The oil return pipe orifice should be below the oil level and have a certain distance from the oil suction pipe. 3. Adjust the concentricity to eliminate scratches. 4. Replace the gear or repair it. 5. Check the skeleton oil seal and replace it when it is damaged to avoid 4. The power supply voltage fluctuation is not large, sucking air

the hydraulic pump rotates inflexibly or bites. 1. The axial clearance and radial clearance are too small. 2. Poor assembly, CB type cover plate, and poor concentricity with the shaft, The spring fastening foot of the long shaft is too long, and the quality of the needle sleeve is too poor. 3. The coaxiality of the coupling between the pump and the motor is not good. 4. Impurities in the oil are sucked into the pump body. 1. Repair the relevant parts. 2. Reassemble according to the requirements. 3. Adjust the different axial degrees to not exceed 0.2mm4. Strictly prevent the surrounding dust, iron filings and cooling water from entering the oil pool, and keep the oil clean

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