Knife/Disc Drive Hydraulics; Reel And Draper Hydraulics; Traction Drive Hydraulics - MacDon M2170 Operator's Manual

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MAINTENANCE AND SERVICING

Knife/Disc Drive Hydraulics

A hydraulic piston pump works in a closed-loop circuit providing oil to the knife/disc circuit. The pump maintains knife/disc

speed at all normal operating engine speeds (>1500 rpm), regardless of header load.

The pump requires charge flow in order to:

• Replace oil from internal leakages

• Fill and maintain positive pressure in the work circuit

• Provide flushing flow for cooling, and introduce clean oil into the circuit

The reel and draper circuits are powered by a gear pump. This allows independent oil flow to the reel and draper circuit

and separates oil flow from the knife pump. The header drive manifold manages flow control and relief for these circuits.

The windrower traction drive consists of two variable displacement axial piston hydraulic pumps, one for each drive wheel.

The pump's speeds are increased through a gearbox from the engine. Each pump requires charge flow in order to

• Replace oil from internal leakages

• Fill and maintain positive pressure in the work circuit

• Provide flushing flow for cooling (occurs at the motors), and introduce clean oil into the circuit