JLG issued this book under document number 3120675, and the 102-page JLG 34HA service manual PDF you get here is that factory original, written for the 34HA aerial work platform rather than adapted from a lookalike model. Relay wiring diagrams and hydraulic schematics close out the book, tracing each circuit from the platform controls down through the turntable. Troubleshooting takes up better than a third of the pages, walking platform, boom, and turntable faults back to a cause, while the procedures chapter covers cylinder repair, swing bearing replacement, and torque hub work for both 2WD and 4WD axles. Set the main relief at 2750 PSI, then pull the swing bearing to turntable bolts to 220 ft. lbs., straight from the specifications chapter. A guessed torque on a boom lift puts people on the ground the hard way. Bookmarks and a live text layer land you on the right procedure in seconds.
What's Inside This JLG 34HA Manual
| System | Pages | Key Topics |
|---|
| List of Illustrations | 4-6 | Relay Wiring, Torque Chart, Serial Number Locations, Lubrication Chart, Boom Prop Configuration, Poly-Pak Seal Configuration, Horizontal Cutoff Switch Adjustment Procedure |
| Specifications | 7-16 | Capacities, Component Data, Performance Data, Torque Requirements, Lubrication, Pressure Settings, Cylinder Specifications, Major Component Weights |
| General Maintenance Guidelines | 17-20 | Safety and Workmanship, Cleanliness, Component Removal and Installation, Pressure-Fit Parts, Bearings, Relief Valves |
| Cylinder Procedures | 21-27 | Boom Prop Configurations, Cylinder Checking Procedures, Cylinder Repair, Cylinder Removal and Installation, Articulating Cylinder |
| Switch and Throttle Adjustments | 28-33 | Tilt Alarm Switch, Horizontal Cutoff Switch, Ford Engine Throttle Adjustments, Deutz Engine Throttle Adjustments |
| Pressure Settings and Swing Bearing | 34-42 | Pressure Setting Procedures, Racine Bang-Bang Valves, Swing Bearing Wear Tolerance, Swing Bearing Replacement, Swing Bearing Bolt Torquing |
| Drive Axle and Brake Maintenance | 43-55 | Torque Hub Disassembly, Torque Hub Assembly, Drive Torque Hub, Drive/Steer Axle, Swing Brake, Drive Brake |
| System Controls and Preventive Maintenance | 56-62 | Pq Controllers, Oscillating Axle Bleeding, Dual Fuel System, Free Wheeling Option, Preventive Maintenance Schedule |
| Troubleshooting | 63-102 | General, Platform Assembly Troubleshooting, Boom Assembly Troubleshooting, Turntable Assembly Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Bearing To Chassis | 110 FT. LBS. (15.21 KGM) | p. 9 |
| Bearing To Turntable | 220 FT. LBS. (30.42 KGM) | p. 9 |
| Ford VSG 411 Engine Oil Capacity | 3.5 quarts | p. 7 |
| Deutz F2L1011 Engine Oil Capacity | 6.9 quarts | p. 7 |
| Main Relief Pressure (Ford/Deutz) | 2750 PSI | p. 10 |
| Steer Relief Pressure (2WD) | 1500 PSI | p. 10 |
| Steer Relief Pressure (4WD) | 2000 PSI | p. 10 |
| Telescope Relief Pressure (In) | 2000 PSI | p. 10 |
| Telescope Relief Pressure (Out) | 1500 PSI | p. 10 |
| Swing Bearing Bolt Torque (Inner Race) | 170 ft. lbs. | p. 42 |
| Swing Bearing Bolt Torque (Outer Race) | 80 ft. lbs. | p. 42 |
| Drive Brake Torque | 50-60 ft. lbs. | p. 54 |
