Eaton's stationary off-line filter units are designed for the oil-service for gears with lubricants of high viscosity for the off-line filtration. They are equipped with a gear pump driven by an e-motor. The circulation filter units US 10-640 take oil from a reservoir connected by a hose to clean it from contaminants (dirt and water). The purified oil is pumped into the intended reservoir. The contaminants accumulate in the filter. The unit works without supervision after the start. The maximum allowable dirt particle size of the working fluid should be <200μm. US series are used for the fine filtration, filling or flushing of hydraulic systems. They are available for various volume flow rates, in different sizes, and with different micron ratings for the required fluid cleanliness.