Drain the original hydraulic oil before replacing, check the return oil filter element, suction oil filter element and pilot filter element to see if there are iron filings, copper filings or other impurities.In some cases, there may be faults in hydraulic components. After overhauling and eliminating, clean the system.
When changing hydraulic oil, all hydraulic oil filter elements (oil return filter element, oil suction filter element, pilot filter element) must be replaced at the same time, otherwise it is equivalent to not changing.
Identify the hydraulic oil label. Do not mix hydraulic oils with different labels and brands, which may react and deteriorate and produce floccules. The oil specified for this excavator is recommended to use.
The suction oil filter element must be installed before refueling. The nozzle covered by the suction oil filter element leads to the main pump directly. The entry of impurities will accelerate the wear of the main pump, and the pump will be beaten.
Refuel to the standard position, there is generally an oil level gauge on the hydraulic oil tank, see the level gauge. Pay attention to the parking method, generally all cylinders are fully retracted, that is, the forearm and bucket are fully extended and landed.
After refueling, pay attention to the main pump to exhaust air, otherwise the whole vehicle will not move temporarily, the main pump will make abnormal noise (air sonic boom), and the air pocket will damage the main pump. The air exhaust method is to directly loosen the pipe joint on the top of the main pump and fill it up directly.
