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CONTENTS
CONTENTS .............................................................................................................................................. 1
SAFETY .................................................................................................................................................... 3
OPERATION ...................................................................................................................................... 4
MAINTENANCE ................................................................................................................................. 5
INTRODUCTION ....................................................................................................................................... 7
EXCAVATOR COMPATIBILITY ................................................................................................................. 7
SERIAL NUMBER LOCATION .................................................................................................................. 8
SPECIFICATIONS ..................................................................................................................................... 9
DG16 ................................................................................................................................................. 9
DG20 ................................................................................................................................................. 10
DG30 ................................................................................................................................................. 11
DG40 ................................................................................................................................................. 12
HYDRAULIC INSTALLATION .................................................................................................................... 13
HYDRAULIC LINES ........................................................................................................................... 13
SHUT-OFF VALVES .......................................................................................................................... 13
PORT CONNECTION DIAGRAM ....................................................................................................... 14
DEMOLITION GRAB HYDRAULIC CIRCUITS ........................................................................................... 15
MOUNTING INSTALLATION ..................................................................................................................... 18
MOUNTING TO THE EXCAVATOR ................................................................................................... 19
REMOVAL FROM THE CARRIER ..................................................................................................... 19
STORAGE OF DEMOLITION GRAB ......................................................................................................... 19
OPERATING INSTRUCTIONS .................................................................................................................. 20
OPERATING TECHNIQUES AND PRECAUTIONS............................................................................ 22
GENERAL MAINTENANCE ....................................................................................................................... 25
DAILY INSPECTION AND MAINTENANCE ....................................................................................... 25
ARM MAINTENANCE ........................................................................................................................ 26
FRAME MAINTENANCE .................................................................................................................... 26
FRAME CRACK REPAIR ................................................................................................................... 26
LUBRICATION POINTS ..................................................................................................................... 27
SLEWING RING INSPECTION AND MAINTENANCE ............................................................................... 28
MEASURING MAXIMUM AXIAL MOVEMENT ................................................................................... 28
NPK ASSEMBLY LUBRICANT .................................................................................................................. 29
ROTARY JOINT MAINTENANCE .............................................................................................................. 30
HYDRAULIC ROTARY JOINT ASSEMBLY ........................................................................................ 30
LEAKAGE OF THE SEALS ................................................................................................................ 30
TESTING THE ROTARY JOINT SEALS FOR INTERNAL LEAKAGE ................................................. 30
REPLACEMENT OF THE SEALS IN THE ROTARY JOINT ............................................................... 31
TROUBLESHOOTING ............................................................................................................................... 35
DETERMINE THE TYPE OF PROBLEM ............................................................................................ 35
MEASURING OPERATING PRESSURES ......................................................................................... 35
RELIEF VALVE CHECKING AND SETTING PROCEDURE ............................................................... 35
COUNTERBALANCE VALVE LOCATION .......................................................................................... 37
TROUBLESHOOTING CHART FOR LOW POWER ........................................................................... 38
CHECKING HYDRAULIC FLOW AT RATED PRESSURE ................................................................. 39
PROCEDURE FOR CHECKING HYDRAULIC FLOW AT RATED PRESSURE .................................. 39
TROUBLESHOOTING CHART FOR SLOW CYLINDER SPEED ....................................................... 41
JAW DRIFT........................................................................................................................................ 41
TO DETERMINE IF THE JAW DRIFT IS OCCURING FROM A BAD CYLINDER OR THE CARRIER. 41
ROTATION ........................................................................................................................................ 42
MEASURING ROTATION PRESSURES ............................................................................................ 42
ROTATION PRESSURE CHECKING PROCEDURE .......................................................................... 43
TROUBLESHOOTING CHART FOR ROTATION ............................................................................... 43
FASTENER TORQUE CHART .................................................................................................................. 45
CYLINDER TORQUE SPECIFICATIONS .................................................................................................. 47
ROD NUT AND PISTON TORQUES .................................................................................................. 47
CONVERT FROM DUAL MOTOR TO SINGLE MOTOR (DG20, DG30, DG40).......................................... 48
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