CONTENTS Group 1 Pump Device Group 4 Pilot Valve Outline ...................................................... T3-1-1 Outline ......................................................T3-4-1 Main Pump, Fan Pump ............................. T3-1-2 Operation ..................................................T3-4-4 Regulator for Fan Pump.......................... T3-1-12 Regulator for Main Pump .......................... T3-1-4 (Only for Travel Pilot Valve) .................T3-4-14 Group 5 Travel Device Shockless Function Pump 1, 2 Control Solenoid Valve Fan Pump Control Solenoid Valve.........
T3-1-28 Outline ......................................................T3-5-1 Pilot Pump .............................................. T3-1-30 Travel Reduction Gear ..............................T3-5-2 Pump Delivery Pressure Sensor ............. T3-1-30 Pump Regulator Pressure Travel Motor ..............................................T3-5-3 (Flow Rate Control Pressure) Sensor ... T3-1-30 Group 2 Swing Device Travel Brake Valve ....................................T3-5-5 Parking Brake .........................................T3-5-12 Group 6 Signal Control Valve Outline ...................................................... T3-2-1 Swing Reduction Gear ..............................
T3-2-2 Outline ......................................................T3-6-1 Pilot Port ...................................................T3-6-2 Swing Motor.............................................. T3-2-3 Shuttle Valve .............................................T3-6-6 Valve Unit ................................................. T3-2-6 Group 3 Control Valve Swing Parking Brake................................. T3-2-4 Shockless Valve ......................................T3-6-10 Arm Flow Rate Control Valve Control Spool, Outline ......................................................
T3-3-1 Swing Parking Brake Release Spool .....T3-6-14 Flow Combiner Valve Control Spool, Hydraulic Circuit ..................................... T3-3-16 Main Relief Valve .................................... T3-3-20 Overload Relief Valve (with Make-Up Function) ....................... T3-3-22 Boom Overload Relief Control Valve....... T3-3-24 Flow Combiner Valve .............................. T3-3-26 Anti-Drift Valve ........................................ T3-3-28 Regenerative Valve................................. T3-3-32 Bypass Shut-Out Valve ........................... T3-3-40 Flow Rate Control Valve ......................... T3-3-36 1J1T-3-1 SECTION 3 COMPONENT OPERATION