JLG 120Hx Service & Maintenance Manual (3120819) – PDF DOWNLOAD (Eng)

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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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