Six common faults in the hydraulic circuit of ZL50 loader (3)

This series of articles will talk about common faults in the hydraulic circuit of the ZL50 loader working device through actual cases. We will first look at the fault symptoms and then discuss the solutions. The first two faults have been analyzed in the previous two articles. In this article, we will continue to look at the analysis of the last two faults.

Fault phenomenon 5: Drop bucket

Reason analysis:
When the loader is operating, the bucket reversing valve returns to the neutral position after the bucket is retracted, and the bucket will suddenly flip down and fall. The reasons for falling buckets are:
1) The bucket reversing valve is not in the neutral position and the oil circuit cannot be closed.
2) The seal of the bucket reversing valve is damaged, the gap between the valve core and the valve body hole is too large, and the leakage is large.
3) The seal of the double-acting safety valve in the bucket cylinder’s rodless cavity is damaged or stuck, and the overload pressure is too low. 4) The sealing ring of the bucket hydraulic cylinder is damaged, severely worn, and the cylinder barrel is strained.
Troubleshooting method: Clean the double-acting safety valve, replace the sealing ring, and adjust the overload pressure. For other troubleshooting methods, please refer to Problem 3.

Fault phenomenon 6: Oil temperature is too high

Reason analysis:
The main reasons for the oil temperature being too high are: the ambient temperature is too high and the system works continuously for a long time; the system works under high pressure and the relief valve is frequently opened; the relief valve setting pressure is too high; there is friction inside the hydraulic pump; and improper selection of hydraulic oil Or deteriorated; insufficient oil. Check to determine the cause of high oil temperature and eliminate it.

The six common faults of the ZL50 loader hydraulic circuit have been written. See you in the next article. In addition, if your loader needs to purchase relevant loader accessories during maintenance and repair, you can contact us. If you need to buy a new loader or a second-hand loader, you can also contact us. CCMIE provides comprehensive loader sales services.