COMPONENT OPERATION / Others (Upperstructure) PILOT SHUT-OFF SOLENOID VALVE The pilot shut-off solenoid valve is a solenoid valve-operated switch valve. The spool in pilot shut-off solenoid valve is shifted by the pilot shut-off lever and turns on or off pilot pres- sure oil to the pilot valve and signal control valve.
Cross Section Z-Z Pilot Shut-Off Solenoid Valve To Ports T1 to T4 To Ports A1 to A4 Port P Spool T1J1-03-07-011 Port H Z A1 P T1 A2 T2 A3 Z T4 T3 A4 HT T1V1-03-07-011 A1 - Travel / Auxiliary Pilot Valve A4 - Unused T1 - Travel / Auxiliary Pilot Valve T3 - Left Pilot Valve A2 - Right Pilot Valve HT - Signal Control Valve (Port PH) T2 - Right Pilot Valve T4 - Hydraulic Oil Tank A3 - Left Pilot Valve P - Primary Pilot Pressure T3-7-1