Daewoo Solar 420LC-V & 470LC-V Hydraulic System Service Manual PDF (EN)

Return to Master Table of Contents 1 HYDRAULICS

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Return to Master Table of Contents 1 HYDRAULIC SYSTEM TROUBLESHOOTING, TESTING AND ADJUSTMENT Copyright 2001 Daewoo November 2001 Page 1 Hydraulic System Troubleshooting, Testing and Adjustment CAUTION! Follow all safety recommendations and safe shop practices outlined in the front of this manual or those contained within this section. Always use tools and equipment that is in good working order. Use lifting and hoisting equipment capable of safely handling load. Remember, that ultimately safety is your own personal responsibility. YDRAULIC SYSTEM TROUBLESHOOTING, TESTING AND ADJUSTMENT MODEL SERIAL NUMBER RANGE Solar 420LC-V 1001 and Up Solar 470LC-V 1001 and Up

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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

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Return to Master Table of Contents Pump Regulator Adjustment ................................................................. 17 Flow Meter and Flow Meter Kit Installation and Testing ............................... 20 Swing System Troubleshooting .................................................................... 22 Precautions/Initial Checks..................................................................... 22 Swing Relief Valve Checking and Adjustment....................................... 22 Troubleshooting - Swing Gearbox ................................................................ 24 Troubleshooting - Hydraulic Problems..........................................................

25 Troubleshooting - Control Valve.................................................................... 27 Troubleshooting - Travel Control Valve.......................................................... 28 Troubleshooting - Joystick Control Valve ...................................................... 29 Page 3 Hydraulic System Troubleshooting, Testing and Adjustment

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