JLG issued document 3120672 as the factory service book for the 40HA aerial platform, and this 105-page JLG 40HA service manual PDF is that publication, unaltered. Electrical diagrams trace every circuit on the machine, while the troubleshooting section, roughly a third of the book, works through hydraulic circuit checks fault by fault. Between those sit cylinder repair, boom maintenance, swing bearing wear tolerances, drive torque hub rebuilds, and the pressure setting procedures your annual inspection leans on. Set the Sepac swing brake at 1500 PSI (103.4 Bar), run the wheel lugs to 80 ft. lbs. (109 Nm), and pull anything else from the torque chart up front. A boom lift parked over a mystery fault earns nothing. Print whatever page the job calls for and let it get greasy on the bench; bookmarks and a real text layer get you to it fast.
What's Inside This JLG 40HA Manual
| System | Pages | Key Topics |
|---|
| List of Illustrations | 4 | Torque Chart, Lubrication Chart, Boom Prop Configurations |
| List of Tables | 5-6 | Hydraulic Oil, Lubrication Specifications, Cylinder Specifications, Component Weights, Stability Weights, Troubleshooting Tables |
| Specifications | 7-16 | Capacities, Component Data, Performance Data, Torque Requirements, Lubrication, Pressure Settings, Cylinder Specifications, Major Component Weights |
| General Maintenance Guidelines | 17-19 | Safety, Cleanliness, Component Removal, Lubrication, Battery Maintenance |
| Cylinder Theory and Repair | 20-28 | Cylinder Theory, Cylinder Checking Procedures, Cylinder Repair, Cylinder Removal and Installation |
| Boom Maintenance | 29-31 | Boom Removal, Boom Disassembly, Boom Inspection, Boom Assembly, Tilt Alarm Switch |
| Engine Throttle and Pressure Settings | 32-38 | Throttle Checks, Governor Adjustments, Pressure Setting Procedures, Control Valves |
| Swing Bearing Maintenance | 39-43 | Swing Bearing Wear Tolerance, Swing Bearing Replacement, Devcon Application, Swing Bearing Torque Values |
| Drive Torque Hub and Brake Maintenance | 44-67 | Drive Torque Hub Disassembly, Drive Torque Hub Assembly, Swing Brake Maintenance, Drive Brake Maintenance, Dual Fuel System |
| Preventive Maintenance Schedule | 68-70 | Inspection Codes, Annual Inspection |
| Troubleshooting | 71-105 | General, Troubleshooting Information, Hydraulic Circuit Checks |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Bearing To Chassis | 110 FT. LBS. (149 Nm) | p. 9 |
| Bearing To Turntable | 220 FT. LBS. (298 Nm) | p. 9 |
| Swing Brake - Ausco (Machines Built Prior to August 1991) | 1500 PSI (103.4 Bar) | p. 14 |
| Swing Brake - Sepac (Machines Built From November 1992 to Present) | 1500 PSI (103.4 Bar) | p. 14 |
| Ford VSG411 engine speed (High) | 3000 RPM | p. 32 |
| Ford VSG411 engine speed (LOW) | 2200 RPM | p. 32 |
| Drive Hub Lubricant Capacity | 17 ounces | p. 7 |
| Ford LSG-411 Engine Oil Capacity (w/Filter) | 3.40 Quarts | p. 7 |
| Deutz F2L1011 Engine Oil Capacity (w/Filter) | 6.90 Quarts | p. 7 |
| Kubota V1200-B Engine Oil Capacity (w/Filter) | 6.0 Quarts | p. 7 |
| Main Relief Pressure (Standard Controls) | 3000 PSI | p. 14 |
| Swing Relief Pressure | 1500 PSI | p. 14 |
