Tilt sensor faults on a mast lift that cuts out at height are exactly what this JLG 1230ES service manual PDF was written for: 198 factory pages, OEM document 3121222, covering the electric aerial platform from base frame to platform controls. DTC check tables carry each fault code through to pin-level tests at the X-connectors, so a flashing display turns into a specific wire you can put a meter on. Electrical schematics, connector loading diagrams, and the hydraulic circuit for pump, lift, and steer fill the back of the book, with component locations mapped on the machine itself. Each standard battery weighs 62 lb (28 kg); torque the wheel bolts to 120 ft lb (163 Nm) after any drive service. A platform stranded at half height helps nobody. This bookmarked, text-searchable PDF puts the specs in front of you and the 1230ES back in service.
What's Inside This JLG 1230ES Manual
| System | Pages | Key Topics |
|---|
| Maintenance Safety Precautions | 3 | General, Hydraulic System Safety, Maintenance |
| Revision Log | 4 | |
| Machine Specifications | 5-22 | Operating Specifications, Lubrication, Cylinder Specifications, Torque Requirements, Serial Number Locations |
| General Service Information | 23-30 | Machine Preparation, Inspection, And Maintenance, Preventive Maintenance and Inspection Schedule, Servicing and Maintenance Guidelines |
| Theory of Operation - 1230ES | 31-36 | Overview, Modes of Operation, CAN Communications, Controls & Sensors, Traction, Pump/Lift/Mast, Steer |
| Base Components | 37-76 | Base Assembly Components, Base Frame Covers, Wheels and Tires - Drive and Rear, Rear Wheel Hub - Installation, Steering Linkage Assembly - Installation, Steer Cylinder - Servicing |
| Control Components | 77-100 | Control Components Overview, Control Components - Service, Traction System, Power Module - P/N-1600346, Power Module - P/N-1001092456, Ground Control Module - Service Procedure |
| Mast Components | 101-118 | Mast Components Overview, Platform Tool Tray - Installation, Mast Cover Plate - Installation, Platform AC Receptacle Box - Installation, Mast Assembly - Components |
| Jlg Control System | 119-132 | Electronic Control System, Machine Configuration Programming Information, Machine Personality - Adjustment Settings, Tilt Sensor Calibration, Tilt Sensor Electrical Evaluation |
| Diagnostic Trouble Codes | 133-154 | Introduction, X-Connector References, DTC Index, DTC Check Tables |
| General Electrical Information & Schematics | 155-198 | General, Multimeter Basics, Electrical Switch Testing, Applying Silicone Dielectric Compound to Amp Connectors, Working with Deutsch Connectors, X-Connector References |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Wheel Bolt Torque | 120 ft lb (163 Nm) | p. 13 |
| Batteries - Standard - Combined | 248 lb. (112 kg) | p. 13 |
| Batteries - Standard (each) | 62 lb. (28 kg) | p. 13 |
| 1st Stage Wheel Torque | 20-30 ft lbs (28 - 42 Nm) | p. 39 |
| Nominal DC Output Voltage | 24V | p. 97 |
| Maximum DC Output Voltage | 33.6V | p. 97 |
| Tilt sensor electrical failure reporting angle | +20.0° | p. 130 |
| Tilt sensor level surface tolerance | ±0.5° | p. 132 |
| Contactor solenoid resistance | 52 Ohms | p. 142 |
| Maximum Platform Height | 12 ft. (3.66 m) | p. 13 |
| Maximum Hydraulic System Pressure (Lift) | 1600 psi (110 bar) | p. 13 |
| Maximum Hydraulic System Pressure (Steer) | 1250 psi (86 bar) | p. 13 |
