Hyundai R 160 LC-3, Service Manual

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3. DRAIN CIRCUIT
Besides internal leaks from the motors and main pump, the oil for lubrication circulates. These oil have
to be fed to the hydraulic tank passing through spin filter.
When the drain oil pressure exceed 1.5kg/cm
2
(21psi), the oil returns to the hydraulic tank directly.
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 after being filtered by spin filter.
SWING MOTOR DRAIN CIRCUIT
Oil leaking from the swing motor come out and return to the hydraulic tank passing through a drain
filter.
MAIN PUMP DRAIN CIRCUIT
Oil leaking from main pump come out and return to the hydraulic tank passing through drain filter.
1)
2)
3)
Travel motor Swing motor
Main pump
Turning joint
Spin filter
Hydraulic
oil tank
Bypass valve
1.5kg/cm
2