JLG 120Hx Service & Maintenance Manual (3120819) – PDF DOWNLOAD
TABLE OF CONTENTS:
JLG 120Hx Service & Maintenance Manual (3120819) – PDF DOWNLOAD
Section A. INTRODUCTION - MAINTENANCE SAFETY PRECAUTIONS....... 3 A General.................................................. 3 B Hydraulic System Safety.................................. 3 C Maintenance.............................................. 3 Section 1. specifications......................................11 1.1 Capacities.............................................11 1.2 Component Data.........................................11 1.3 Performance Data.......................................11 1.4 Function Speeds (Machines Built Prior to S/N 38697)....12 1.5 Function Speeds (Machines Built After S/N 38697).......13 1.6 Torque Requirements....................................13 1.7 Lubrication............................................15 1.8 Pressure Settings - PSI (Bar)..........................20 1.9 Serial Number Locations................................21 1.10 Major Component Weights...............................21 1.11 Boom Tape.............................................22 1.12 Cylinder Specifications...............................22 1.13 Critical Stability Weights............................22 Section 2. procedures..........................................23 2.1 General................................................23 2.2 Servicing and Maintenance Guidelines...................23 2.3 Lubrication Information................................24 2.4 Cylinders - Theory of Operation........................25 2.5 Valves - Theory of Operation...........................25 2.6 Boom Chains............................................26 2.7 Wear Pads..............................................30 2.8 Drift Test.............................................30 2.9 Cylinder Checking Procedures...........................31 2.10 Cylinder Removal and Installation.....................33 2.11 Cylinder Repair.......................................35 2.12 Boom Maintenance......................................39 2.13 Tilt Alarm Switch.....................................46 2.14 Limit Switch Adjustments..............................47 2.15 Throttle Checks and Adjustments - Deutz Engine........47 2.16 Pressure Setting Procedures...........................47 2.17 Swing Bearing.........................................54 2.18 Drive Torque Hub......................................57 2.19 Swing Torque Hub......................................62 2.20 swing brake...........................................65 2.21 Drive Brake...........................................67 2.22 Free Wheeling Option..................................69 2.23 PQ Controllers........................................70 2.24 Boom Marking Tape Installation........................73 2.25 Boom Length/Angle Sensor Adjusting Procedure..........73 2.26 Load Management System................................75 2.27 Load Management System Adjustment.....................80 2.28 Turntable Springs.....................................80 2.29 Drive Motor Adjustment Procedure......................80 2.30 Preventive Maintenance and Inspection Schedule........82 Section 3. TROUBLESHOOTING.....................................87 3.1 General................................................87 3.2 Troubleshooting........................................87 3.3 Hydraulic Circuit Checks...............................87
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