Details: Komatsu PC430-8 excavator, the excavator is used to build the river embankment in the hydropower station, which has not been repaired before. Recently, the excavator has experienced severe gear pump vibration.
Failure cause analysis:
1. The air inlet at the end face seal. The end cover hole of the pump does not fit well with the outer diameter of the gland
2. Check the gear tooth profile accuracy, the perpendicularity of the gear inner hole and end face, the parallelism of the two hole axes on the cover plate, the parallelism of the two end faces of the pump body, the high tooth surface roughness, whether the common normal length exceeds the tolerance, and whether the backlash is too small
3. Check whether the end clearance is too small and whether the internal parts of the pump are worn and damaged
Troubleshooting:
1. Check whether the end face seal directly contacting the pump body and the end covers on both sides is air intake. If it is, handle it Check whether the fitting between the pump gland and the outer diameter end cover hole is not good, which leads to poor sealing, thus allowing air to enter. If so, strengthen the sealing.
2. If any fault is found in this item, it is recommended to replace the gear or grind the gear. Check whether the end clearance is too small to make it difficult for the gear to rotate.
3. Check whether the parts inside the pump are damaged or worn, and replace them if necessary; Fault found As the internal parts of the pump are found damaged, it is recommended to disassemble and repair the gear pump, and repair or replace the bearing.
