What does the bypass check valve above the excavator tank do?

The function of one-way valve is to make the return oil generate enough pressure to compensate the possible holes in the system and prevent the radiator and filter from being damaged due to excessive disturbance or impact of the return oil.

When the flow capacity of the filter decreases, the bypass check valve can be opened to reduce the oil return pressure and protect the filter. Generally, the set pressure is about 0.5MPa. When installing the check valve, special attention should be paid to the flow direction of the medium, which should be consistent with the direction of the arrow marked on the valve body, otherwise the normal flow of the medium will be cut off. The bottom valve should be installed at the bottom of the water pump suction pipeline.

For the newly installed excavator, all parts must be filled with oil before trial operation, and the lubrication situation should be checked in shifts during work; For excavators that have been stopped for a long time, all the old dry oil must be squeezed out before use.

Good lubrication can reduce mechanical wear and failure in operation, and the lubrication work must be carried out in strict accordance with the time limit, oil quantity and lubricating oil type specified in the excavator manual.

When the excavator stops running, it is necessary to carefully check whether the anchor screws and bearing seat screws of various parts of the excavator are loose, whether the gears are engaged and lubricated, and whether the bearings, power plant, control system, brake, reducer, track shoes, foundation parts, cables, wire ropes, bucket teeth and other parts are abnormally worn and damaged.