Name: JLG 120HX
Brand: JLG
Rating: 5 (1 reviews)

Default Chapter3

Subject - Section, Paragraph18

Section 2. Procedures21

General21
Servicing and Maintenance Guidelines21
- Safety and Workmanship21
- Cleanliness21
- Components Removal and Installation21
- Component Disassembly and Reassembly21
- Pressure-Fit Parts21
- Bearings21
- Gaskets22
- Bolt Usage and Torque Application22
- Hydraulic Lines and Electrical Wiring22
- Hydraulic System22
- Lubrication22
- Battery22
- Lubrication and Servicing22
Lubrication Information22
- Hydraulic Oil23
- Changing Hydraulic Oil23
- Lubrication Specifications23
Cylinders - Theory of Operation23
Valves - Theory of Operation23
- Solenoid Control Valves (Bang-Bang)23
- Manual Hydraulic Control Valves24
- Relief Valves24
- Crossover Relief Valves24
Boom Chains24
- Adjusting Procedures24
- Inspection Procedure26
Wear Pads28
Drift Test28
- Telescope Cylinder28
- Lift Cylinder29
Cylinder Checking Procedures29
- Cylinder W/O Counterbalance Valves - Steer Cylinders, Master Level Cylinder, Frame Jack Cylinders29
- Cylinders W/Single Counterbalance Valves - Lift Cylinder, Telescope Cylinder, Extend-A-Reach Cylinder30
- Cylinders W/Dual Counterbalance Valve - Axle Extension Cylinders, Telescope Cylinder, Platform Slave Level Cylinder30
Cylinder Removal and Installation31
- Telescope Cylinder Removal31
- Telescope Cylinder Installation31
- Lift Cylinder Removal32
- Lift Cylinder Installation32
- Master Level Cylinder Removal33
- Master Level Cylinder Installation33
Cylinder Repair33
- Disassembly33
- Cleaning and Inspection34
- Assembly35
Cylinder Piston Nut Torque Specifications36
Boom Maintenance37
- Removal37
- Disassembly37
- Inspection41
- Assembly41
- Installation42
Tilt Alarm Switch44
- Manual Adjustment44
- Voltmeter Adjustment45
Limit Switch Adjustments45
- Boom Limit Switch45
- Horizontal Cut-Out Switch45
Throttle Checks and Adjustments - Deutz Engine45
Pressure Setting Procedures45
- Main Valve45
- Frame Valve47
Swing Bearing52
- Turntable Bearing Mounting Bolt Condition Check52
- Wear Tolerance53
- Replacement53
- Swing Bearing Torque Values55
Drive Torque Hub55
- Disassembly55
- Cleaning and Inspection57
- Assembly58
Swing Torque Hub60
- Disassembly60
- Cleaning and Inspection60
- Assembly60
- Swing Torque Hub61
Swing Brake63
- Cleaning and Inspection63
- Assembly63
- Swing Brake64
Drive Brake65
- Disassembly65
- Inspection65
- Assembly65
Free Wheeling Option67
- To Disengage Drive Motors and Brakes (Free Wheel) for Towing, Etc67
- To Engage Drive Motors and Brakes (Normal Operation)67
PQ Controllers68
- TRIM Adjustment (Prior to S/N 38697)68
- TRIM Adjustment (S/N 38697 to Present)69
- RAMP Adjustment71
- Boom Marking Tape Installation72
- Boom Length/Angle Sensor Adjusting Procedure72
- Load Management System73

Subject - Section, Paragraph72

Section 3. Troubleshooting83

Brand	JLG
Model	120HX
Category	Lifting Systems
Language	English

JLG 120HX Service Manual

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JLG 120HX Specifications

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