A boom that creeps out of sync or a Sevcon controller flashing codes at you will stall a rental fleet fast; JLG wrote publication 3120743, a 104-page service manual for six electric aerial platform variants in the 30E through 45E family, to settle exactly those problems. Anyone hunting for a JLG 35E service manual PDF gets the same factory book here, N-series machines included. Wiring diagrams trace the traction and pump motor circuits, hydraulic schematics map every holding valve, and troubleshooting tables for platform, boom, turntable, and chassis fill the last quarter of the book. Confirm the charger is pushing 48 VDC at 23 amps before you condemn a battery pack, then torque the wheel bolts to 90 ft. lb. (122 Nm). A guessed pressure setting can tip a platform; a printed one can't. Bookmarked and text-indexed, this PDF drops you on the swing bearing procedure in two clicks.
What's Inside This JLG 30E-45E Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction - Maintenance Safety Precautions | 3-8 | General, Hydraulic System Safety, Maintenance |
| Specifications | 9-24 | Capacities, Component Data, Performance Data, Torque Specifications, Lubrication, Pressure Settings, Major Component Weights, Critical Stability Weights |
| General Servicing and Maintenance Guidelines | 25-27 | Safety and Workmanship, Cleanliness, Component Removal and Installation, Hydraulic System Maintenance, Battery Maintenance |
| Cylinder and Valve Theory of Operation | 28 | Double Acting Cylinders, Control Valves, Steer Valve, Holding Valves |
| Motor Controller Operation and Diagnostics | 29-34 | Traction Motor Drive, Pump Motor Drive, Diagnostic Flash Codes, Sevcon Controller Troubleshooting |
| Boom Maintenance and Wear Pads | 35-40 | Wear Pad Adjustment, Boom Removal, Telescope Cylinder Removal, Boom Section Disassembly |
| Cylinder Checking, Repair, and Installation | 41-55 | Cylinder Checking Procedures, Cylinder Repair, Piston Seal Installation, Lift Cylinder Removal, Telescope Cylinder Installation |
| Swing Bearing and Drive System Procedures | 56-71 | Tilt Indicator Switch Leveling, Pressure Setting Procedures, Swing Bearing Replacement, Drive Torque Hub Disassembly, Drive Brake Assembly |
| Preventive Maintenance and Inspection Schedule | 72-76 | Mid and Lower Lift Cylinder Bleeding, Boom Synchronizing Procedure, Free Wheeling Procedure, Footswitch Adjustment, Preventive Maintenance Schedule |
| Troubleshooting | 77-104 | Troubleshooting Information, Platform Assembly Troubleshooting, Boom Assembly Troubleshooting, Turntable Assembly Troubleshooting, Chassis Assembly Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Wheel Bolts | 90 ft. lb. (122 Nm) | p. 11 |
| Battery Charger Input | 110 VAC, 60 HZ | p. 9 |
| Battery Charger Output | 48 VDC (23 Amps.) | p. 9 |
| Drive Motor Power | 4.1 H.P. | p. 9 |
| Drive Motor Speed | 1880 rpm | p. 9 |
| Thermal Cutback Temperature | 80 degrees C (176 degrees F) | p. 31 |
| Low Battery Voltage Fault | below 13 volts | p. 31 |
| Upper Lift Cylinder Nut Torque (Wet) | 200 ft. lbs. (271 Nm) | p. 51 |
| Slave Cylinder (To 12/94) Nut Torque (Wet) | 50 ft. lbs. (68 Nm) | p. 51 |
| Slave Cylinder (From 12/94 to present) Nut Torque (Wet) | 80 ft. lbs. (109 Nm) | p. 51 |
| Mid Lift Cylinder Nut Torque (Wet) | 200 ft. lbs. (271 Nm) | p. 51 |
| Hydraulic Oil Tank Capacity | 4.0 gallons | p. 9 |
JLG 30E-45E Series Common Problems This Manual Covers
JLG 35e boom lift powers up but will not drive or steer, Sevcon flashes six times
Check the Sevcon diagnostic display first; six flashes indicates a faulty drive hand controller. Test the controller output using the diagnostics chart on page 32: a wiper voltage below 2.5V at power up, or above 4.5V while in drive, sets the fault. Inspect the harness connectors for corrosion before replacing the controller, then cycle power and retest.
Manual Section: Motor Controller Operation and Diagnostics p. 32Machine powers up but will not travel forward or reverse, drive motors dead
Verify battery pack voltage before condemning parts; the Sevcon controller shuts down drive below 13 volts and shows a seven-flash fault. Check the footswitch and interlock inputs, then trace the drive circuit using the wiring diagram on page 92. Test each drive motor brush and connection if the controller inputs check good.
Manual Section: Chassis Assembly TroubleshootingBatteries will not charge overnight, charger hums but shows no output voltage
Verify the charger sees 110 VAC, 60 Hz at the wall outlet, then measure charger output at the batteries; you should see 48 VDC at 23 amps per the specifications on page 9. Clean and tighten the battery terminals, check electrolyte levels in every cell, and load test the pack before replacing the charger.
Manual Section: General Servicing and Maintenance Guidelines p. 25Boom drifts down slowly at rest, platform creeps toward the ground overnight
Check the boom holding valve for contamination first. Run the cylinder checking procedure starting on page 46 to confirm whether the piston seals are bypassing. If the cylinder fails the drift check, reseal it and torque the piston nut to 200 ft. lbs. (271 Nm) wet on reassembly, per the chart on page 51.
Manual Section: Cylinder Checking, Repair, and Installation p. 46Hydraulic pump whines and cavitates after service, boom and lift functions feel slow
Check the hydraulic tank level first; the tank holds 4.0 gallons and the full system takes 4.8 gallons, listed on page 9. Inspect the suction line for loose fittings pulling air and a clogged strainer. Drain, refill with clean oil, then trace the suction circuit on the hydraulic schematic on page 100 if cavitation continues.
Manual Section: Hydraulic System TroubleshootingFrequently Asked Questions
How do I reset a JLG 30E fault code?
To obtain a flash code, depress the footswitch and repeat the operation that caused the fault. After the fault occurs, maintain the footswitch and function position to read the code. Refer to the troubleshooting flow charts on page 31 for specific diagnostic steps. p. 30
How do I reset a JLG 35E platform lift after an error?
Most faults on the JLG 35E can be cleared by recycling the footswitch or by recycling the key switch to neutral. For specific diagnostic codes, refer to the troubleshooting flow charts starting on page 31. p. 31
What are the torque specifications for JLG 40E cylinder piston nuts?
For the 40/n40 electric models, the upper lift cylinder piston nut torque is 200 ft. lbs. (271 Nm), the lower lift cylinder is 400 ft. lbs. (542 Nm), and the telescope cylinder locknut torque is 150 ft. lbs. (203 Nm). p. 51
What are the replacement specifications for the battery charger on a JLG 30E-45E Series aerial platform?
The battery charger input is 110 VAC, 60 HZ, and the output is 48 VDC at 23 Amps. p. 9
What is the recommended hydraulic oil for JLG lifts?
JLG Industries recommends Mobilfluid 424 hydraulic oil, which has an SAE viscosity of 10W-30 and a viscosity index of 152. p. 27
How is this JLG 30e Service Manual delivered?
This is a 104-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this JLG 30e manual print-friendly?
You can. The PDF is unlocked and carries no copy protection, so print the sections you want and keep the file as your backup.
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