Komatsu WA180-3, WA180L-3 Wheel Loader Service Manual

Table of Contents

• General
• Structure and Functions
• Testing and Adjusting
• Disassembly and Assembly
• Maintenance Standard
• Others

Manual Extract Lower Valve:

The oil from the pump passes through the torque They act to raise the clutch oil pressure smoothly, converter oil filter, enters the transmission valve, and thereby reducing the shock when shifting gear is divided into the pilot circuit and the clutch During traveling, the clutch pressure is kept the actuation circuit.

The priority valve gives priority to the oil sent to the pilot circuit, so the pilot pressure is always kept the same.
The pressure of the oil flowing to the clutch actuation circuit is adjusted by the modulation fill valve and actuates the clutch. The oil which is relieved is sent to the torque converter.
The quick return and modulation fill valve are interconnected during gear shifting.

They act to raise the clutch oil pressure smoothly, thereby reducing the shock when shifting gear. During traveling, the clutch pressure is kept the same.
The pressure of the oil which flows to the circuit is adjusted by the pilot reducing valve. During gear shifting, the oil flows in accordance with ON-OFF position of the solenoid valves and actuates the FORWARD, REVERSE and speed spools.
By switching the FORWARD, REVERSE, and speed spools, the oil regulated by the modulation fill valve is sent to the selected clutch to obtain the necessary gear combination.

! The pressure of the oil flowing to the clutch position of the solenoid valves and actuates the actuation circuit is adjusted by the modulation fill FORWARD, REVERSE and speed spools.
valve and actuates the clutch. The oil which is ! By switching the FORWARD, REVERSE, and relieved is sent to the torque converter. speed spools, the oil regulated by the modulation ! The quick return and modulation fill valve are fill valve is sent to the selected clutch to obtain the interconnected during gear shifting. necessary gear combination.