3-4
3. DRAIN CIRCUIT
Besides internal leaks from the motors and main pump, the oil for lubrication circulates.
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.
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 .
1)
2)
Travel motor
Swing motor
Turning
joint
Return line
Hydraulic
oil tank
Return filter
R35Z73HC43
