Clean hydraulic oil is the life of a hydraulic system. There are many precision parts in the hydraulic system, some have damping holes, some have gaps and so on. If the solid impurities invade, it will cause the precision coupler to be pulled, the card is issued, the oil passage is blocked, etc., and the safe operation of the hydraulic system will be endangered. The general ways for solid impurities to invade the hydraulic system are: unclean hydraulic oil; unclean refueling tools; careless refueling and repair and maintenance; hydraulic components desquamation, etc. The intrusion of solid impurities into the system can be prevented from the following aspects:

1. When refueling

Hydraulic oil must be filtered and filled, and the filling tool should be clean and reliable. Do not remove the filter at the filler neck of the fuel tank in order to increase the rate of refueling. Refueling personnel should use clean gloves and overalls to prevent solid and fibrous impurities from falling into the oil.

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2. During maintenance

Remove the hydraulic oil tank filler cap, filter cover, inspection hole, hydraulic oil pipe and other parts, so as to avoid dust when the oil passage of the system is exposed, and the disassembled part must be thoroughly cleaned before opening. For example, when removing the oil filler cap of the hydraulic oil tank, first remove the soil around the oil tank cap, unscrew the oil tank cap, and remove the debris remaining in the joint (do not rinse with water to prevent water from infiltrating the oil tank), and open the oil tank cap after confirming that it is clean. When wiping materials and hammers need to be used, wiping materials that do not lose fiber impurities and special hammers with rubber attached to the striking surface should be selected. Hydraulic components and hydraulic hoses should be carefully cleaned and dried with high pressure air before assembly. Choose a well-packaged genuine filter element. When changing the oil, clean the filter at the same time. Before installing the filter element, use a wiping material to carefully clean the dirt at the bottom of the filter housing.