What are the common faults of METARIS high pressure gear pumps?
The common faults of METARIS high-pressure gear pumps include insufficient pump oil, abnormal noise, overheating, leakage and difficult start-up. The specific analysis is as follows：
- Insufficient pump oil or no oil output
reason：
The oil level of the fuel tank is too low, causing the oil pump to inhale air.
The suction pipe leaks, the pipe is not tightly sealed or the joint is loose.
The suction filter is clogged, restricting the flow of oil into the pump.
The gear wears out, the gap increases after long-term operation, and the sealing performance decreases.
Wear of the bushing will also increase the gap, affecting the sealing and transmission of oil.
The oil in the pump is polluted, and impurities enter the pump, clogging the oil circuit or damaging parts.
The oil temperature is too high, which leads to a decrease in the viscosity of the oil, which affects the oil absorption capacity of the pump.
The installation position of the pump is improper, such as the installation of the pump body is too high, which exceeds its self-priming range.
Treatment method：
Check the oil level of the fuel tank to ensure that it is within the specified range.
Observe whether there is air leakage in the suction line, and check whether each joint is fastened.
Remove the suction filter, check if it is clogged, and clean or replace it when needed.
Check the wear of the gears and bushings and replace them if necessary.
Replace the oil regularly and keep the oil clean.
Adjust the installation position of the pump to ensure that it is within the self-priming range. - Abnormal noise
reason：
The liquid level is low and the liquid cannot be absorbed, resulting in holes in the pump.
The bearing wear gap is too large, resulting in inflexible rotation.
The active gear and the driven gear shaft are not parallel, or the active gear shaft is different from the motor shaft.
The shaft is bent, causing vibration when rotating.
Debris, such as metal particles, fibers, etc., is ingested into the pump.
The gear wears out, resulting in an increase in the gap between the teeth.
The keyway is loose or broken, resulting in unstable transmission.
The anchor bolts are loose, causing the pump body to vibrate.
Inhale air, such as a leak in the suction line or a low oil level in the fuel tank.
Treatment method：
Increase the liquid level to ensure that the liquid can be inhaled smoothly.
Replace the bearing and adjust the clearance to the specified range.
Find the spur gear shaft and the motor shaft to ensure the coaxiality.
Replace the curved shaft to ensure smooth rotation.
Clean up the debris in the pump and check whether the filter is clogged.
Repair or replace worn gears.
Repair or replace the keyway to ensure stable transmission.
Tighten the anchor bolts to reduce vibration.
Eliminate air leakage and ensure that the suction line is well sealed. - Overheating of the pump body
reason：
The oil temperature is too high, resulting in a decrease in the viscosity of the oil in the pump.
The bearing gap is too small or too large, resulting in increased friction.
The radial, axial, and tooth side gaps of the gear are too large, resulting in increased leakage.
The packing is too tight, resulting in increased rotational resistance.
The outlet valve is opened too small, causing the pressure to be too high.
Poor lubrication leads to increased wear and tear of the friction pair.
Treatment method：
Cool the oil and reduce the oil temperature.
Adjust the bearing clearance to the specified range.
Adjust or replace the gears to ensure that the clearance is appropriate.
Adjust the tightness of the packing to reduce the rotational resistance.
Adjust the opening of the outlet valve to reduce the pressure.
Replace the lubricating grease to ensure good lubrication.
Four, leakage
reason：
There are problems with the quality of the seals, such as aging and deformation of the seals.
Improper installation of seals, such as the sealing ring is not installed correctly, insufficient compression force, etc.
There are defects in the pump body or end cap, such as cracks, sand holes, etc.
The oil temperature is too high, which causes the seal to harden and wear to intensify.
Treatment method：
Replace the seals of qualified quality.
Reinstall the seal to ensure that the installation is correct and the compression force is sufficient.
Repair or replace the defective pump body or end cap.
Control the oil temperature within a reasonable range to reduce the wear of seals.
V. Difficulty in starting
reason：
The mechanical properties of the pump shaft are not up to standard, such as improper material selection and improper heat treatment process.
Foreign objects get stuck in the gear, causing the transmission torque to be too large.
Poor lubrication leads to burning of needle roller bearings and wear of pump shafts.
The poor coaxiality of the coupling affects the synchronization of the gear pump and the motor.
Treatment method：
Choose suitable materials and ensure that the heat treatment process is correct to improve the mechanical properties of the pump shaft.
Identify the source of foreign objects and clean up immediately to ensure the smooth rotation of the gears.
Check regularly and ensure that the lubrication system is working normally, and replace worn parts in time.
Ensure that the coaxiality of the coupling is within the specified range to reduce vibration and noise.
