3. DRAIN CIRCUIT 3. DRAIN CIRCUIT Travel motor Swing motor Turning joint Return line T3 ~ T7 Return filter Hydraulic oil tank Besides internal leaks from the motors and main pump, the oil for lubrication circulates. 1) 1) TRAVEL MOTOR DRAIN CIRCUIT TRAVEL MOTOR DRAIN CIRCUIT Oil leaked from the right and left travel motors comes out of the drain ports provided in the respective motor casing and join with each other. These oils pass through the turning joint and return to the hydraulic tank after being filtered by return filter.
2) 2) SWING MOTOR DRAIN CIRCUIT SWING MOTOR DRAIN CIRCUIT Oil leaked from the swing motor returns to the hydraulic tank passing through a return filter with oil drained from the travel circuit. 3-4