320D3 and 323D3 Excavators Systems Caterpillar

Illustration 1	g06309890
Case drain filter

The case drain filter receives case drain oil from the following components.

• Right travel motor

• Left travel motor

• Swing motor

• Main hydraulic pump (drive pump and idler pump)

Case drain oil flow from the right travel motor, the left travel motor, and the swing motor are combined at the swivel. The case drain oil flow from these components then flows to the case drain filter. The case drain oil from the main hydraulic pumps also flows to the case drain filter. Return oil then flows from the case drain filter to the hydraulic tank.