Hyundai HX130LCR Manual page 136

3. DRAIN CIRCUIT
Travel motor
Turning
joint
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 drain filter.
When the drain oil pressure exceed 1.5 kgf/cm
1)
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 drain filter.
2) SWING MOTOR DRAIN CIRCUIT
Oil leaked from the swing motor returns to the hydraulic tank passing through a drain filter.
3)
MAIN PUMP DRAIN CIRCUIT
Oil leaked from main pump returns to the hydraulic tank passing through drain filter.
Swing motor
Dr#, dr#
Hydraulic
oil tank
(21 psi), the oil returns to the hydraulic tank directly.
2
Main pump
From return line
3-4
Drain filter
Dr
Check valve
1.5kgf/cm
2
21093CI02