Return to Master Table of Contents TABLE OF CONTENTS Hydraulic System - General Notes................................................................. 4 Hydraulic Schematic....................................................................................... 5 General Notes......................................................................................... 5 Operation of Working Components ................................................................ 6 Boom Operating Circuit........................................................................... 6 Boom Up Circuit......................................................................................
6 Boom Down Circuit ................................................................................. 6 Arm Operating Circuit ............................................................................. 7 Arm Crowd Circuit................................................................................... 7 Arm Dump Circuit.................................................................................... 7 Bucket Operating Circuit ......................................................................... 8 Bucket Crowd Circuit...............................................................................
8 Bucket Dump Circuit ............................................................................... 8 Swing Operating Circuit .......................................................................... 8 Right Swing Operating Circuit................................................................. 9 Left Swing Operating Circuit ................................................................... 9 Swing Relief Valve and Make-up Valve ................................................... 9 Travel Operating Circuit........................................................................... 9 Forward Travel Circuit............................................................................
10 Reverse Travel Circuit............................................................................ 10 Procedural Troubleshooting Baseline Recommendations............................ 11 Initial Checks and Tests to Establish Operating Condition of the Excavator 11 Pilot Pressure............................................................................................... 12 Adjustment and Testing......................................................................... 12 Power Mode Valve........................................................................................ 13 Current Signal and Hydraulic Pressure Adjustments............................
13 Boom/Front Priority Valve............................................................................. 14 Control Valve Pressure and Current Adjustments................................. 14 Pressure Up Valve........................................................................................ 15 Checks and Adjustments ...................................................................... 15 Pump Input Power Control ........................................................................... 17 Page 2 Hydraulic System Troubleshooting, Testing and Adjustment