JLG 120Hx Service & Maintenance Manual (3120686) – PDF DOWNLOAD

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JLG 120Hx Service & Maintenance Manual (3120686) – PDF DOWNLOAD

TABLE OF CONTENTS:

JLG 120Hx Service & Maintenance Manual (3120686) – 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)..........................18
	1.9 Serial Number Locations................................19
	1.10 Major Component Weights...............................19
	1.11 Boom Tape.............................................19
	1.12 Cylinder Specifications...............................19
	1.13 Critical Stability Weights............................20
Section 2. PROCEDURES..........................................21
	2.1 General................................................21
	2.2 Servicing and Maintenance Guidelines...................21
	2.3 Lubrication Information................................22
	2.4 Cylinders - Theory of Operation........................23
	2.5 Valves - Theory of Operation...........................23
	2.6 Boom Chains............................................24
	2.7 Wear Pads..............................................28
	2.8 Drift Test.............................................28
	2.9 Cylinder Checking Procedures...........................29
	2.10 Cylinder Removal and Installation.....................31
	2.11 Cylinder Repair.......................................33
	2.12 Boom Maintenance......................................37
	2.13 Tilt Alarm Switch.....................................44
	2.14 Limit Switch Adjustments..............................45
	2.15 Throttle Checks and Adjustments - Deutz Engine........45
	2.16 Pressure Setting Procedures...........................45
	2.17 Swing Bearing.........................................52
	2.18 Drive Torque Hub......................................55
	2.19 Swing Torque Hub......................................60
	2.20 swing brake...........................................63
	2.21 Drive Brake...........................................65
	2.22 Free Wheeling Option..................................67
	2.23 PQ Controllers........................................68
	2.24 Boom Marking Tape Installation........................72
	2.25 Boom Length/Angle Sensor Adjusting Procedure..........72
	2.26 Load Management System................................73
	2.27 Load Management System Adjustment.....................78
	2.28 Turntable Springs.....................................78
	2.29 Drive Motor Adjustment Procedure......................78
	2.30 Preventive Maintenance and Inspection Schedule........79
Section 3. TROUBLESHOOTING.....................................83
	3.1 General................................................83
	3.2 Troubleshooting........................................83
	3.3 Hydraulic Circuit Checks...............................83

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