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HYDRAULIC SCHEMATICS, TROUBLESHOOTING, TESTING & ADJUSTMENT PROCEDURES ............... 2
INTRODUCTION ............................................................................................................................................... 2
GENERAL TEST PROCEDURES .................................................................................................................... 2
HYDRAULIC SPECIFICATIONS ........................................................................................................................... 4
TROUBLESHOOTING.................................................................................................................................... 5
CONTROL AND PARK BRAKE PILOT PRESSURE TROUBLESHOOTING ................................................ 5
BOOM LIFT TROUBLESHOOTING ................................................................................................................. 6
BOOM EXTEND CYLINDER TROUBLESHOOTING ...................................................................................... 7
ATTACHMENT TILT CYLINDER TROUBLESHOOTING ............................................................................... 8
FRAME LEVELING TROUBLESHOOTING ..................................................................................................... 9
STEERING CIRCUIT TROUBLESHOOTING ................................................................................................ 10
SCHEMATICS ....................................................................................................................................................... 11
HYDRAULIC SCHEMATICS .......................................................................................................................... 11
HYDRAULIC SCHEMATICS WITH PWP ...................................................................................................... 13
HYDRAULIC SYSTEM TESTING ........................................................................................................................ 15
PUMP PRESSURE TEST ............................................................................................................................... 15
FLOW DIVIDER PRESSURE TEST .............................................................................................................. 16
LIFT CYLINDER TEST ................................................................................................................................... 17
TILT CYLINDER QUICK TEST ...................................................................................................................... 21
TILT CYLINDER DIRECT TEST .................................................................................................................... 21
TILT CYLINDER LOAD CHECK VALVE QUICK TEST ................................................................................ 24
TILT CYLINDER LOAD CHECK VALVE DIRECT TEST .............................................................................. 24
EXTENSION CYLINDER QUICK TEST ......................................................................................................... 26
EXTENSION CYLINDER DIRECT TEST ...................................................................................................... 27
EXTENSION CYLINDER LOAD CHECK VALVE QUICK TEST .................................................................. 28
EXTENSION CYLINDER LOAD CHECK VALVE DIRECT TEST AND ADJUSTMENT ............................. 29
FRAME LEVELING PRESSURE TESTS ............................................................................................................ 30
FRAME LEVELING CYLINDER QUICK TEST .............................................................................................. 30
FRAME LEVELING CYLINDER DIRECT TEST ............................................................................................ 31
FRAME LEVELING LOAD CHECK VALVE QUICK TEST ........................................................................... 32
FRAME LEVELING LOAD CHECK VALVE DIRECT TEST ......................................................................... 33
MAIN CONTROL VALVE PRESSURE RELIEF TEST AND ADJUSTMENT .................................................... 36
MAIN RELIEF VALVE QUICK TEST AND ADJUSTMENT ........................................................................... 36
JOYSTICK CONTROL AND PARK BRAKE PRESSURE TEST ........................................................................ 38
STEERING CIRCUIT PRESSURE TEST ........................................................................................................... 41
STEERING CIRCUIT PRESSURE QUICK TEST ......................................................................................... 41
STEERING CIRCUIT PRESSURE DIRECT TEST ....................................................................................... 41
SECTION TABLE OF CONTENTS
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