How should the Niigata piston pumps on excavators be maintained?

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As we all know, no matter what type of pump it is, it requires maintenance after being used for a long time, and the Niigata piston pumps are no exception. This is even more important for the Fushikoshi piston pumps used in excavators. Since construction sites where excavators are used are filled with dust and other particles, which can more easily cause damage to the Nippon Koki piston pumps, this article will discuss how to maintain such pumps on excavators. Various construction machines are in use on construction sites, and hydraulic excavators are one of the most important types of such machines. The hydraulic system, with its Niigata piston pumps, is one of the most crucial systems in these machines. In the case of fully hydraulic excavators, it can be said that the hydraulic system functions like the blood circulation system in the human body, spreading throughout the entire excavator. It includes components such as the hydraulic oil tank, main pump, multi-way valve, various pipelines, as well as cylinders and motors that carry out different actions. These hydraulic components are manufactured with high precision, and their proper maintenance is essential. Improper maintenance or lack of maintenance can lead to failures, causing the machine to stop operating and resulting in losses for you. Three key points for keeping the hydraulic system clean: Keep the hydraulic oil clean, store the oil in a clean location, and be careful when changing or adding oil. Oil can only be poured from the container into the fuel tank using a cleaning funnel equipped with a fine-mesh filter. Of course, the oil you use must be of the type recommended by Hitachi Construction Machinery. Keep the system clean (1) Replace the hydraulic oil and filters regularly. High-quality hydraulic oil contains various additives that prevent the oil from deteriorating. However, these additives lose their effectiveness after some time. Therefore, the oil should be replaced regularly to ensure that the additives function effectively. A filter can only absorb a limited number of dirt particles and other impurities from the oil. For Hitachi Construction Machinery ZX series (medium-sized) machines, replace the hydraulic tank return filter every 1,000 hours of operation, and clean the hydraulic tank suction filter when changing the hydraulic oil, in order to keep the system clean. When replacing the hydraulic oil filter, check whether there are any metal particles or debris at the bottom of the filter ； The presence of copper or iron shavings indicates that the hydraulic pump, hydraulic motor, or valves may be damaged or about to become damaged, while the presence of rubber particles suggests that the seals of the hydraulic cylinders are damaged. 2) Regularly discharge tank contaminants: It is important to remove water and sediment from the tank in order to eliminate impurities in the oil. However, it is equally important to replace the hydraulic fluid throughout the entire hydraulic system on a regular basis. This is the only reliable method to completely remove system impurities, oxidized hydraulic oil, and other harmful contaminants. Then, the cleaning hydraulic oil recommended by Hitachi Construction Machinery should be added back to the hydraulic system. Please drain the contaminants from the hydraulic oil tank sump every 250 working hours. (3) Cleaning: If the hydraulic oil in the Niigata plunger pump is contaminated, especially when the hydraulic pump or hydraulic cylinders and motors are damaged, it is necessary to replace all the hydraulic oil and clean the tank. Keep the work area clean. When adding or refilling hydraulic fluid into the tank, make sure the area around the filter box cover is clean. Only clean funnels or containers can be used. Do not introduce dirt into the system. When maintaining the hydraulic system, only clean plastic plugs should be used to seal the ends of the pipes. When maintaining hydraulic components, the workbench must be absolutely clean. Check the condition of the tools used; they should also be very clean.