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 |
JLG 60H, 70H Common Problems This Manual Covers
JLG 60H boom lift engine dies as soon as the foot switch is pressed in the platform
Check the footswitch adjustment first: the switch must actuate the controls within the last 1/4 in. (6.35 mm) of pedal travel, per the procedure on page 92. Inspect the switch wiring and connectors for corrosion or pinched wires, tracing the circuit against the wiring diagram on page 114. Replace the switch if adjustment will not hold.
Manual Section: Controllers and Preventive Maintenance p. 92Boom swing responds in only one direction or rotation is erratic and jerky
Test pilot pressure first; it should read 250 to 400 PSI (17.2 to 31 Bar), spec on page 47. Set the swing relief to 1200 PSI (82.7 Bar) using the pressure setting procedures that start on page 45. If pressures check out, inspect the swing drive brake for dragging per the brake procedures on page 78.
Manual Section: Pressure Setting Procedures p. 45Boom raises slowly under load or will not lift the rated platform capacity
Check hydraulic oil level and condition before touching the valves. Test main relief pressure for the proportional functions against the 3000 PSI (206.8 Bar) spec on page 15, and verify lift up adjust at 2500 PSI (172.38 Bar). Set pressures per the procedures on page 45, and replace the return filter with a 10 micron element if the oil looks contaminated.
Manual Section: Hydraulic System TroubleshootingPlatform will not stay level during boom elevation, drifts nose down at height
Work through the platform leveling chart on page 98. Bleed the leveling circuit, then check the master and slave cylinders for internal bypass using the cylinder checking procedure starting on page 23. Both level cylinders run a 2.50 in. bore; if the seals are bypassing, rebuild them with the service procedures on page 27.
Manual Section: Platform Assembly Troubleshooting p. 98Boom drifts down slowly when parked elevated or creeps during work stops
Remove and inspect the boom holding valves for debris on the poppets. Clean and reseat each cartridge, then torque SUN 7/8 hex valves to 30-35 ft. lbs. (41-48 Nm) per the chart on page 31. If drift continues, test the lift cylinder for internal bypass with the cylinder checking procedure on page 23.
Manual Section: Boom Assembly TroubleshootingFrequently Asked Questions
What is the torque specification for the wheel lug nuts on the JLG 60H/70H?
The torque specification for the wheel lug nuts on the JLG 60H and 70H models is 300 lbs. (407 Nm). These should be checked at an interval of 100 hours. p. 10
What is the required torque for the turntable bearing bolts on the JLG 60H/70H?
The bearing to turntable bolts require a torque of 220 lbs. (298 Nm). These should be retorqued after the first 200 hours of operation and every 500 hours thereafter. p. 10
What is the fuel tank capacity for the JLG 60H/70H?
The fuel tank capacity for the JLG 60H and 70H models is 26 U.S. Gallons (98.41 L). p. 7
Where can I find the correct main relief valve pressure setting for the Racine Proportional Valve on a JLG 60H, 70H?
The main relief valve for the Racine Proportional Valve system should be set to 2750 psi (189.61 Bar). p. 14
What oil viscosity does JLG recommend for the 60H, 70H hydraulic system between 50 degrees F and 210 degrees F?
For hydraulic system operation in temperatures ranging from 50 degrees F to 210 degrees F (+10 degrees C to +99 degrees C), the recommended SAE viscosity grade is 20W-20. p. 10
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