For a full hydraulic excavator, it can be said that the hydraulic system is spread all over the excavator just like the blood circulation system of the human body. It includes hydraulic oil tank, main pump, multi-way valve, pipeline, oil cylinder and motor for performing various actions. These hydraulic components are all made of precision machining, which requires high maintenance of the hydraulic system. Improper maintenance or no maintenance will lead to failure, machine downtime and loss.
Keep the system clean.
(1) Replace the hydraulic oil and filter regularly.
Good hydraulic oil contains many additives, which can prevent the oil from deteriorating.
However, these additives will fail after a period of time. Therefore, the oil should be changed regularly to ensure that the additives play a role.
Filters can only absorb a limited amount of dust particles and other impurities from oil.
For ZX series (medium-sized) machines of Hitachi Construction Machinery Co., Ltd., please replace the oil return filter of the hydraulic oil tank every 1000 working hours, and clean the oil absorption filter of the hydraulic oil tank when replacing the hydraulic oil to keep the system clean.
When replacing the hydraulic oil filter, please check whether there are metal particles or debris at the bottom of the filter; If there are copper chips or iron chips, the hydraulic pump, hydraulic motor or valve may be damaged or will be damaged; If there is rubber, the seal of the hydraulic cylinder is damaged.
(2) Regularly discharge oil tank dirt.
It is very important to regularly drain the water and sediment in the oil tank to remove impurities in the oil, but it is also very important to regularly replace the hydraulic oil in the whole hydraulic system. This is the only reliable way to thoroughly remove system impurities, oxidized hydraulic oil and other harmful impurities. Then, clean hydraulic oil recommended by Hitachi Construction Machinery should be added to the hydraulic system again.
Please drain the dirt from the hydraulic oil tank every 250 working hours.
(3) Cleaning
If the hydraulic oil is polluted, especially when the pump, cylinder and motor are damaged, all hydraulic oil must be replaced and the oil tank must be cleaned.
Keep the work area clean.
When adding hydraulic oil to the tank or adding hydraulic oil again, make sure that the area around the filter cover is clean.
Only clean funnels or containers can be used.
Never bring dust into the system.
When maintaining the hydraulic system, only clean plastic plugs can be used to seal the pipe ends.
When repairing hydraulic components, the workbench must be absolutely clean.
Check the tools used, they should also be very clean.
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