Details: Komatsu PC430-8 excavator. The excavator repaired the embankment at Wanzu Hydropower Station, which has not been repaired before. Recently, the excavator has experienced a phenomenon of severe vibration of the gear pump.
Failure analysis:
1. Air intake at the end face seal. The fit between the end cover hole of the pump and the outer diameter of the gland is not good.
2. Check the accuracy of the tooth profile of the gear, the perpendicularity of the inner hole of the gear and the end face, the parallelism of the axis of the two holes on the cover plate, the parallelism of the two ends of the pump body, the high roughness of the tooth surface, whether the length of the common normal is out of tolerance, and whether the backlash of the tooth is too Wait a minute.
3. Whether the end face gap is too small. The internal parts of the pump are worn and damaged.
Troubleshooting:
1. Check whether the seal between the pump body and the end faces directly contacting the end covers on both sides is inhaled, and if the contact surface is treated, check whether the pump gland and the outer diameter end cover hole are not well matched, resulting in a loose seal So that air enters, if there is sealing and reinforcement.
2. If a fault is found in this item, it is recommended to replace the gear or to grind the gear. Check whether the end face gap is too small to make the gear rotation difficult.
3. Check whether the internal parts of the pump are damaged or worn, and it is recommended to replace them if there are any; find the fault. Because the internal parts of the pump are damaged, it is recommended to disassemble and repair the gear pump and repair or replace the bearings.
