COMPONENT OPERATION

／ Main pump

・Return Filter

The return filter is installed in the return circuit to the oil tank to remove fine dust including in the oil, which could not be removed by the suction strainer. The oil returning from the steering circuit and shovel circuit enters the cartridge through the inlet port, passes through the filter, and is sent to the oil tank through the outlet port.

If the pressure in the inlet port increases and the pressure difference from the outlet port becomes 0.14Mpa when the filter clogged or the oil temperature is low, the bypass valve is opened and the oil is sent directly from the inlet port to the outlet port without passing through the filter. As this return filter is the cartridge type.