3. DRAIN CIRCUIT 3. DRAIN CIRCUIT Travel motor Swing motor From return line Main pump Turning joint dr# Hydraulic oil tank Return filter Td# 480A3CI02 Besides internal leaks from the motors and main pump, the oil for lubrication circulates. These oil returns to the hydraulic tank directly. 1) 1) TRAVEL MOTOR DRAIN CIRCUIT TRAVEL MOTOR DRAIN CIRCUIT Oil leaking 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 directly.
2) 2) SWING MOTOR DRAIN CIRCUIT SWING MOTOR DRAIN CIRCUIT Oil leaking from the swing motor come out and joins the travel motor drain line and return to the hydraulic tank. 3) 3) MAIN PUMP DRAIN CIRCUIT MAIN PUMP DRAIN CIRCUIT Oil leaking from main pump come out and return to the hydraulic tank directly. 3-5 3-5