NPK GH1 - Table of Contents

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CONTENTS
SAFETY ..................................................................................................................1
INTRODUCTION.....................................................................................................5
BASIC OPERATING INSTRUCTIONS....................................................................5
PRECAUTIONS FOR USING THE NPK HYDRAULIC HAMMER ..........................6
CARRIER MACHINE COMPATIBILITY ..................................................................7
HAMMER SPECIFICATIONS .................................................................................8
STRUCTURE..........................................................................................................9
HAMMER SERIAL NUMBER LOCATION...............................................................11
PRINCIPLE OF OPERATION .................................................................................12
HYDRAULIC INSTALLATION.................................................................................13
MOUNTING INSTALLATION ..................................................................................17
ROUTINE INSPECTION AND MAINTENANCE......................................................18
WEEKLY INSPECTION ..........................................................................................19
CHANGING THE TOOL..........................................................................................20
TROUBLESHOOTING ............................................................................................22
CHECKING THE HYDRAULIC PRESSURES ........................................................23
CHECKING THE HYDRAULIC FLOW TO THE HAMMER .....................................24
OIL LEAKAGE.........................................................................................................26
GAS LEAKAGE.......................................................................................................27
EXCESS OIL IN THE GAS HEAD INSPECTION PROCEDURE............................28
NITROGEN GAS PRESSURE................................................................................29
GAS CHARGING KIT..............................................................................................29
CHECKING THE GAS PRESSURE........................................................................30
GAS CHARGING THE HAMMER ...........................................................................32
REMOVAL AND MOUNTING OF HYDRAULIC HAMMER .....................................33
TOOLS REQUIRED FOR DISASSEMBLY .............................................................34
NPK START-UP KIT ...............................................................................................35
NPK ASSEMBLY LUBRICANT ...............................................................................36
DISASSEMBLY PROCEDURE...............................................................................37
DISCHARGING GAS PRESSURE..........................................................................38
DISASSEMBLING THE MAIN BODY......................................................................40
DISASSEMBLY OF MAIN VALVE ..........................................................................46
INSPECTION AND REPAIR AFTER DISASSEMBLY.............................................48
REPAIR SECTION INTRODUCTION......................................................................49
REPAIR TOOLS AND EQUIPMENT.......................................................................49
HAMMER SLEEVE AND PISTON RECONDITIONING TOOLS.............................50
MAIN BODY BORE REPAIR...................................................................................52
PISTON ACTIVE SEAL AREA REPAIR..................................................................62
PISTON TO SLEEVE RUNNING CLEARANCES ...................................................63
REPAIR THE STRIKING END OF PISTON............................................................64
MAIN BODY SLEEVES...........................................................................................64
REPLACING THE SEALS.......................................................................................65
REASSEMBLY OF THE HAMMER.........................................................................67
STANDARD TOOLS ...............................................................................................83
ACCESSORY TOOLS.............................................................................................83