JLG 120HX Boom Lift Service and Maintenance Manual (CE)

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This service manual PDF download for the 120HX JLG Boom Lift has been prepared as an aid to improve the quality of repairs by giving the serviceman an accurate understanding of the product and by showing him the correct way to perform repairs and make judgements. Make sure you understand the contents of this manual and use it to fully at every opportunity.


A General
B Hydraulic System Safety
C Maintenance

Section 1. specifications
1.1 Capacities
1.2 Component Data
1.3 Performance Data
1.4 Function Speeds (Machines Built Prior to S/N 38697)
1.5 Function Speeds (Machines Built After S/N 38697)
1.6 Torque Requirements
1.7 Lubrication
1.8 Pressure Settings – PSI (Bar)
1.9 Serial Number Locations
1.10 Major Component Weights
1.11 Boom Tape
1.12 Cylinder Specifications
1.13 Critical Stability Weights

Section 2. procedures
2.1 General
2.2 Servicing and Maintenance Guidelines
2.3 Lubrication Information
2.4 Cylinders – Theory of Operation
2.5 Valves – Theory of Operation
2.6 Boom Chains
2.7 Wear Pads
2.8 Drift Test
2.9 Cylinder Checking Procedures
2.10 Cylinder Removal and Installation
2.11 Cylinder Repair
2.12 Boom Maintenance
2.13 Tilt Alarm Switch
2.14 Limit Switch Adjustments
2.15 Throttle Checks and Adjustments – Deutz Engine
2.16 Pressure Setting Procedures
2.17 Swing Bearing
2.18 Drive Torque Hub
2.19 Swing Torque Hub
2.20 swing brake
2.21 Drive Brake
2.22 Free Wheeling Option
2.23 PQ Controllers
2.24 Boom Marking Tape Installation
2.25 Boom Length/Angle Sensor Adjusting Procedure
2.26 Load Management System
2.27 Load Management System Adjustment
2.28 Turntable Springs
2.29 Drive Motor Adjustment Procedure
2.30 Preventive Maintenance and Inspection Schedule

3.1 General
3.2 Troubleshooting
3.3 Hydraulic Circuit Checks



File Format : PDF
Language : English
Printable : Yes
Searchable : Yes
Bookmarked : Yes
Part Number : 3120819
Total Pages : 116

This service manual / repair manual / workshop manual PDF download contains specs, diagrams, actual real photo illustrations, and schemes. In addition to space savings, nice thing about having completly searcheble PDF files instead of a hard-printed manual is that you can use the Search feature in your PDF reader software (Adobe Acrobat) to find just what your looking for and just print out the exact pages you need or all manual easily. This is the same manual your local dealer will use when doing a repair. This is a must for the Do-It-Yourselfer! Saving Yourself $$$$$$ In Service Repair And Maintenance Costs !!!!

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JLG 120HX Boom Lift Service and Maintenance Manual (CE).pdf

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