NPK DG16 - Page 3

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CONTENTS

WARRANTY STATEMENTS ..................................................................................................................... 49

KEYWORDS FOR COMMON DEMO GRAB COMPONENTS .................................................................... 51

NOTES...................................................................................................................................................... 52

SERVICE RECORD .................................................................................................................................. 52

Main Page

Table of Contents2
Contents2
Safety4
- Operation5
- Maintenance6
Introduction8
Excavator Compatibility8
Serial Number Location9
Specifications10
- Dg1610
- Dg2011
- Dg3012
- Dg4013
Hydraulic Installation14
- Hydraulic Lines14
- Shut-Off Valves14
- Port Connection Diagram15
Demolition Grab Hydraulic Circuits16
Mounting Installation19
- Mounting to the Excavator20
- Removal from the Carrier20
Storage of Demolition Grab20
Operating Instructions21
- Operating Techniques and Precautions23
General Maintenance26
- Daily Inspection and Maintenance26
- Arm Maintenance27
- Frame Maintenance27
- Frame Crack Repair27
- Lubrication Points28
Slewing Ring Inspection and Maintenance29
- Measuring Maximum Axial Movement29
Npk Assembly Lubricant30
Rotary Joint Maintenance31
- Hydraulic Rotary Joint Assembly31
- Leakage of the Seals31
- Testing the Rotary Joint Seals for Internal Leakage31
- Replacement of the Seals in the Rotary Joint32
Troubleshooting36
- Determine the Type of Problem36
- Measuring Operating Pressures36
- Relief Valve Checking and Setting Procedure36
- Counterbalance Valve Location38
- Troubleshooting Chart for Low Power39
- Checking Hydraulic Flow at Rated Pressure40
- Procedure for Checking Hydraulic Flow at Rated Pressure40
- Troubleshooting Chart for Slow Cylinder Speed42
- Jaw Drift42
- To Determine if the Jaw Drift Is Occuring from Abad Cylinder or the Carrier42
- Rotation43
- Measuring Rotation Pressures43
- Rotation Pressure Checking Procedure44
- Troubleshooting Chart for Rotation44
Fastener Torque Chart46
Cylinder Torque Specifications48
- Rod Nut and Piston Torques48
Convert from Dual Motor to Single Motor (Dg20, Dg30, Dg40)49
Warranty Statements50
Keywords for Common Demo Grab Components52
Notes53
Service Record53

NPK DG16 - Page 3

Table of Contents