4Wd Oil Flow - Kubota M8540 Workshop Manual

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M8540, M9540, WSM

[2] 4WD OIL FLOW

Oil pressure-fed from the power steering hydraulic

pump is flowed to the 4WD solenoid valve (1) through the

steering controller and oil cooler. The system hydraulic

pressure-fed to disengaged position for 4WD clutch (6)

when 4WD switch at 2WD position. As the 4WD solenoid

valve does not electrified, the oil flows to 2WD mode.

When the 4WD switch turned on, the 4WD solenoid valve

is electrified, the oil flow is switched and engage the 4WD

The maximum pressure against the clutch piston is

regulated under approx. 2.16 MPa (22.0 kgf/cm

psi) by the relief valve (2) of system pressure.

On the other hand, the return oil is flowed to the

transmission case through the valve case.

(1) 4WD Solenoid Valve

(2) Relief Valve

(3) Differential Lock Solenoid

(4) PTO Solenoid Valve

(5) PTO Clutch Pack

(6) 4WD Clutch Pack

(7) Differential Lock Piston

TRANSMISSION

A : 2WD Port

B : 4WD Port

P : From Power Steering Pump

KiSC issued 09, 2008 A

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