Whether a 60H holds rated relief pressure or a 70H swing bearing sits within wear tolerance comes down to figures only the factory published, and they live in this 130-page JLG 60H, 70H service manual PDF for boom-type aerial platforms, publication 3120630. Pressure setting procedures for both Racine and Vickers proportional valves anchor the hydraulic side, while cylinder repair runs from the checking procedure through Poly Pak seal installation and the telescope cylinder eccentric bushing. Relay wiring diagrams back a troubleshooting section that fills the final quarter of the book, tracing platform, boom, hydraulic, and electrical faults to root cause. Set the Racine main relief at 2750 psi, then torque wheel lugs to 300 lbs before the machine rolls. Guess at that relief and you buy a pump. One bookmarked, keyword-ready download, bought once and yours for the life of the machine.
What's Inside This JLG 60H, 70H Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction - Maintenance Safety Precautions | 3-5 | General Safety Precautions |
| List of Illustrations and Tables | 6 | Torque Chart, Lubrication Chart, Relay Wiring |
| Specifications | 7-18 | Capacities, Component Data, Performance Data, Torque Requirements, Lubrication, Pressure Setting, Cylinder Specifications, Boom Tape |
| General Maintenance Guidelines | 19-22 | General Maintenance, Component Removal and Installation, Hydraulic System Safety, Boom Chain Adjustment |
| Cylinder Repair and Maintenance | 23-32 | Boom Chain Inspection, Cylinder Checking Procedure, Cylinder Repair, Telescope Cylinder Eccentric Bushing |
| Boom Maintenance | 33-37 | Boom Removal, Boom Disassembly, Boom Inspection, Boom Assembly, Tilt Alarm Switch |
| Engine and Governor Adjustments | 38-44 | Horizontal High Speed Cutout Switch, Governor Checks, Adeco Adjustment, Throttle Checks, Choke Adjustments |
| Pressure Setting Procedures | 45-64 | Racine Proportional Valve, Vickers Proportional Valve, Solenoid Valve Pressure Settings, Extend-A-Reach Valve Settings |
| Swing Bearing and Torque Hub Procedures | 65-77 | Racine Proportional Air Gap, Swing Bearing Wear Tolerance, Torque Hub Disassembly, Torque Hub Assembly |
| Brake System Procedures | 78-89 | Swing Drive Brake, Drive Brake, Mico Brake Assembly, Ausco Brake Assembly, Brake Bleeding |
| Controllers and Preventive Maintenance | 90-96 | Oscillating Axle Bleeding, Lockout Cylinder, Oscillating Axle Lockout Test, Preventive Maintenance Schedule |
| Troubleshooting | 97-130 | Troubleshooting Information, Platform Assembly Troubleshooting, Boom Assembly Troubleshooting, Hydraulic Assembly Troubleshooting, Electrical Assembly Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bearing To Chassis | 110 lbs. (149 Nm) | p. 10 |
| Bearing To Turntable | 220 lbs. (298 Nm) | p. 10 |
| Auxiliary Power Pump | 3.75 GPM (14.19 lpm) | p. 8 |
| Racine Proportional Valve Main Relief | 2750 psi (189.61 Bar) | p. 14 |
| Vickers Proportional Valve Main Relief | 3200 psi (220.64 Bar) | p. 14 |
| Master Level Cylinder Bore | 2.50 in. | p. 25 |
| Slave Level Cylinder Bore | 2.50 in. | p. 25 |
| Telescope Cylinder Piston Nut Torque (Wet) | 600 ft. lbs. (814 Nm) | p. 30 |
| Telescope Cylinder Piston Nut Torque (Dry) | 200 in. lbs. (23 Nm) | p. 30 |
| Swing Adjust | 1200 PSI (82.7 Bar) | p. 46 |
| Pilot Pressure | 250 - 400 PSI (17.2 - 31 Bar) | p. 47 |
| Piston installation depth | 1/8 inch (0.32 cm) | p. 82 |
