The common faults of gear pump in use include small flow, no oil absorption, insufficient pressure and Large Noise, Oil Leakage, Overheating, Abnormal Operation of Oil Pump or Stuck Shaft, Broken Pump, etc. For these Problem analysis and solutions for your reference.
1.The oil pump does not absorb oil or the flow is very small
This phenomenon may be caused by the following reasons:
- The oil suction position is too high or the oil level is insufficient;
- High oil temperature;
- The oil filter is blocked;
- The clearance between the gear in the gear pump and the end faces of the front and rear cover plates is large;
- The sealing performance of gear pump is not good
Resolvent:
- Fill oil in the oil tank and lower the oil suction position;
- Add a cooler in the oil tank or use air cooling;
- Clean or replace the filter element of the oil filter;
- Replace the pump body;
- Replace sealing elements and fasten connectors
2、 Insufficient pressure
Generally, we can start from the following aspects
- Whether the pressure of the overflow valve is too low or the overflow valve is damaged;
- The oil filter is blocked;
- The viscosity of the oil is too high or the temperature is too high;
- Wear occurs in the gear pump and the clearance is large;
- The gear pump body has cracks or leaks;
- The power of the motor does not match the gear pump
Resolvent:
- Adjust the pressure of the overflow valve or replace it with a new one
- Clean the oil filter and replace it with a new filter element;
- No. 20 engine oil is suitable for working at 10-50 ° C ambient temperature. If the oil temperature is too high, a cooling device needs to be installed;
- Replace the gear pump;
- In case of leakage, a paper pad can be added between the pump body and the pump cover to fasten the connector. If the pump body has cracks, the pump body needs to be replaced;
- Select matching motor
3. High vibration and noise
This phenomenon may be caused by the following reasons:
- The diameter of oil inlet pipe is too small;
- The oil filter is blocked;
- The speed is too high;
- During installation, the gear pump shaft is not concentric with the oil pump or motor;
- Gear error or two gear axes are not parallel;
- Inhale air into the pump
Resolvent:
- Replace the oil inlet pipe with large diameter;
- Clean the filter;
- Reduce the speed;
- Adjust the coaxiality between the gear pump shaft and the oil pump or motor to not exceed 0.01mm;
- More smooth and high-precision gear to ensure that the gear axis is parallel;
- Check whether air is sucked in and replace the seal
4.Oil leakage from oil pump
The Causes May Be:
- The oil seal in the pump body is aging and damaged;
- The seal is damaged due to high pressure in the pump;
- The shaft head frame spring falls off;
- The fit between the pump cover and the sealing ring is too loose.
Resolvent:
- Replace the oil seal;
- Find out the cause and replace the seal;
- Regrind the sealing surface;
- Adjust the clearance between pump cover and sealing ring.
5、 The oil pump does not operate normally or is stuck
Causes:
- There are impurities in the pump;
- Pressure valve failure;
- The concentricity of gear pump, oil pump and motor coupling is not enough;
- The axial clearance and radial clearance of the pump body are too small;
- The needle roller does not rotate flexibly;
- The concentricity between the cover plate and the shaft is not enough.
Resolvent:
- Check the hydraulic system, replace the hydraulic oil, clean the filter element and replace the gear pump;
- Replace the spring, remove the dirt from the small hole of the valve body, or replace the valve;
- Adjust the coaxiality;
- Adjust the axial or radial clearance;
- Replace the movable needle roller bearing;
- Replace the cover plate to make it concentric with the shaft.