Loader hydraulic system

When the loader bucket is fully loaded, at the rated engine speed, the lifting time of the boom should be less than 7 seconds, and the forward tilting time of the bucket should be less than 2.5 seconds. If it exceeds the corresponding time, it is considered slow action; The set pressure of the hydraulic system of the working device is 17Mpa. If it is lower than this pressure, it means that the system pressure is too low. The faults of the hydraulic system of the working device are mainly manifested in two aspects: slow lifting, weak or no action of the boom; The bucket flips slowly, weakly, or without any movement. The main cause of the two malfunctions is low working oil pressure, and the main reasons for low pressure are blockage and leakage. Smooth oil circuit and good sealing are the guarantees for the normal operation of the system. Blockage and leakage are the most common hydraulic transmission faults, so the inspection of hydraulic transmission faults generally starts from the hydraulic oil circuit. The following are diagnostic and troubleshooting methods for different fault phenomena in the hydraulic system of ZL50C working device.

loaderhydraulic systemFault phenomenon: The lifting of the boom is slow, weak or inactive, while the flipping of the bucket is normal in the hydraulic system of the working device. If only the lifting of the boom is slow, weak or inactive, while the flipping of the bucket is normal. It is not difficult to see from the working principle diagram that the rotary bucket is working normally, which indicates that the working pump and the main safety valve are working normally, and the pressure they provide to the entire system is sufficient. At the same time, it also indicates that the pipeline and oil filter at the pump inlet end, as well as the oil volume and quality in the oil tank, are not a problem. At this point, it is only necessary to check the boom slide valve, boom cylinder, oil pipe of the boom section, and their seals.

(1) The several components that need to be checked for oil circuit blockage are easy to troubleshoot but difficult to diagnose, so we only need to perform routine treatment by removing the oil pipe, dismantling the boom slide valve body, valve stem, and related components for cleaning, cleaning the oil passage thoroughly, and blowing it dry with compressed air.

(2) Checking for oil circuit leaks. Hydraulic system leaks usually occur after a period of use. From the surface phenomenon, it is mostly caused by seal failure, damage, extrusion, or sealing surface being pulled. The main reasons include: oil contamination, improper sealing surface roughness, unqualified sealing grooves, loose pipe joints, increased clearance between mating parts, high oil temperature, deteriorated sealing rings or poor assembly. Leakage is divided into internal leakage and external leakage, and generally starts with the inspection of external leakage.

Technical requirements for hydraulic system of loader:

1. Before assembly, all components need to be sorted and cleaned thoroughly

2. Assemble when conditions permit, and tighten all fasteners without any looseness during assembly.

3. The length can be customized according to specific customer needs or based on on-site craftsmanship.

4. Unqualified products must be strictly controlled and not assembled.

5. After assembly, the overall appearance is beautiful and clean.

label:hydraulic systemProduct Series

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