Description

Komatsu WA180-1 Wheel Loader Service Manual

Wheel Loader Model: WA180-1
Publication Number: SEBMU4170105 & SEBM034906

English
Format: PDF

Komatsu WA180-1 Wheel Loader  Service Manual – 505 Pages & 514 Pages

Manual Table of Content:

• Engine
• Power Train
• Steering System
• Brake System
• Work Equipment System
• Electrical and Electronic System
• Others
• Structure and Functions
• Testing and Ajusting
• Disassembly and Assembly
• Maintenance Standard
• Others

Manual Extract MAIN REGULATOR VALVE:

FUNCTION
• The main regulator valve serves to regulate the oil pressure in the circuit and supply pressurized oil to the clutch and the cut-off valve. The valve also delivers relieved oil to the torque converter and solenoid valve.
OPERATION

• The oil delivered from the pump enters orifice “a”
and reaches the spool rear side through regulator spool (1 ).
• The oil that has reached the spool rear side is pressurized. When the oil is pressurized to the pre:set pressure, it moves the regulator spool to the left, overcoming the tension of springs (2) and (3). This, in turn, opens the pump A and torque converter B port, allowing the oil to flow into the torque converter circuit.
• If the oil pressure in the circuit goes up, exceeding the set pressure, the regulator spool (1) moves further to the left, causing the pump A and drain C ports to open. Thereby, the abnormally highly pressurized oil relieves itself into the drain opening.