Details: Hitachi zx60-5a excavator has not been repaired before Recently, the excavator has experienced large internal and external leakage of the gear pump.
Failure cause analysis:
The main parts causing internal leakage are between the pump cover and the gear end face, the side plate and the gear end face, or the floating shaft sleeve and the gear end face The oil pump housing is worn.
Troubleshooting:
1. Check whether the corresponding contact surface is worn, strained or has a large gap, resulting in serious internal leakage (which accounts for 50% - 70% of the total) If found, repair the damaged part immediately
2. Check whether the pump body is subject to certain wear, or whether the oil is dirty, resulting in wear between relative moving surfaces, resulting in "internal leakage"
3. After further inspection, it was found that the fault was caused by the damage of the low-pressure chamber in the pump body and the unclean oil After corresponding treatment, the fault disappears.
