A telehandler that cranks but won't start, and no schematic in the cab: that is the failure this book exists to fix. Factory service manual 3126024 covers the JLG 266, 307, and 266 LoPro telehandlers across 126 pages, the same JLG 266, 307 service manual PDF dealer techs pull up. Electrical schematics fill the back third of the book, with circuit breakdowns for the engine start and charging circuits plus fuse and relay maps. Hydraulic schematics pair with a pressure diagnosis routine, and the Deutz BF 4M 2012 gets its own section from cooling system through coupler replacement. Set low idle at 925 rpm, give or take 50, and torque wheel lug nuts to 300 Nm (221 lb-ft). One missing number can park your machine all afternoon. Bookmarked sections and a live text layer get you there fast; print the page and let it catch grease on the bench.
What's Inside This JLG 266, 307, 266 LoPro Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Practices | 7-10 | Introduction, Disclaimer, Operator & Safety Manual, Do Not Operate Tags, Safety Information |
| General Information and Specifications | 11-22 | Replacement Parts and Warranty Information, Torques (Astm Fastener Torque Chart, Metric Fastener Torque Chart) |
| Boom | 23-32 | Boom System Component Terminology, Boom System - Two Section Boom, Boom Assembly Maintenance, Boom Wear Pads, Quick Switch Assembly, Troubleshooting |
| Cab and Covers | 33-42 | Operator’s Cab and Covers Component Terminology, Operator’s Cab, Cab Components, Cab Removal, Cab Installation |
| Axles, Drive Shafts, Wheels and Tires | 43-54 | Axle, Drive Shaft and Wheel Component Terminology, Axle Assemblies, Drive Shafts, Wheels and Tires, Steering Adjustment, Brakes |
| Transmission | 55-60 | Transmission Assembly Component Terminology, Transmission Description, Transmission Specifications, Transmission Replacement, Towing a Disabled Machine |
| Engine: Deutz Bf 4M 2012 | 61-70 | Introduction, Engine Serial Number, Specifications and Maintenance Information, Engine Cooling System, Engine Electrical System, Fuel System, Engine Exhaust and Air Cleaner System |
| Hydraulic System | 71-92 | Hydraulic Component Terminology, Safety Information, Specifications, Hoses, Tube Lines, Fittings, Etc., Hydraulic Pressure Diagnosis |
| Electrical System | 93-126 | Electrical Component Terminology, Specifications, Fuses and Relays, Electrical System Schematics, Circuit Breakdowns, Engine Start Circuit, Charging Circuit |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Standard wheel lug nut torque | 300 Nm (221 lb-ft) | p. 17 |
| Motor mount bolts torque | 97 Nm (71 lb-ft) | p. 69 |
| Fuel level sender resistance (full tank) | 31 ohms | p. 115 |
| Fuel level sender resistance (1/2 tank) | 101 ohms | p. 115 |
| Engine Low Idle | 925 ±50 rpm | p. 17 |
| Engine High Idle | 2370 ±50 rpm | p. 17 |
| Engine Crankcase Oil Capacity w/Filter Change | 9,0 liters (9.6 quarts) | p. 18 |
| Boom Pivot Pin Torque | 90 Nm (66 lb-ft) | p. 27 |
| 266 & 266 LoPro | ||
| Fuel Tank Capacity | 95 liters (25 gallons) | p. 18 |
| Hydraulic System Capacity | 106 liters (28 gallons) | p. 18 |
| 307 | ||
| Fuel Tank Capacity | 102 liters (27 gallons) | p. 18 |
| Hydraulic System Capacity | 133 liters (35 gallons) | p. 18 |
JLG 266, 307, 266 LoPro Common Problems This Manual Covers
JLG 266 telehandler starts, runs briefly, then shuts down and will not restart
Check fuel delivery before blaming the controller. Test the fuel level sender at the tank; it should read 31 ohms full and 255 ohms empty per the chart on page 115. Inspect fuel lines for restriction, then open the fuse relay block and check the fuel pump circuit connectors for water intrusion after any engine bay washdown.
Manual Section: Electrical System p. 115Display shows communication error and machine locks out, engine stuck at idle
Check battery voltage first; low or high system volts set faults that mimic a dead controller. Match the code against the fault table on page 119, then unplug and inspect the CAN harness connectors and fuse relay block for corrosion or bent pins. After clearing the fault, confirm low idle holds at 925 ±50 rpm.
Manual Section: Fault Codes p. 119Boom will not fully extend and shifts sideways under load, wear pads squeal
Inspect the wear pads first and follow the boom troubleshooting procedures starting on page 31 to shim them correctly. Check the extend cylinder set screws and torque any loose ones to 20-25 Nm (15-18 lb-ft). Grease the pads, cycle the boom to full extension, and verify it holds position under load without drifting.
Manual Section: Boom Troubleshooting p. 31Brakes will not hold on grades and pedal feels soft or spongy
Measure the brake disc gap; if it falls outside the 4.10 mm (0.016 inch) minimum tolerance on page 53, replace the discs. Check the wheel end housing for oil leaks that contaminate the friction surfaces, then bleed the circuit and test brake pressure before putting the machine back on a slope.
Manual Section: Axles, Drive Shafts, Wheels and Tires p. 53Engine cranks slowly and lacks power once running, black smoke under load
Test the batteries and clean the start circuit grounds before touching the engine. Service the air cleaner element; black exhaust usually points to a starved intake or overfueling. Check oil level and quality, crankcase capacity is 9.0 liters (9.6 quarts) with a filter change per page 18, then verify high idle reaches 2370 ±50 rpm.
Manual Section: Engine: Deutz Bf 4M 2012 p. 61Frequently Asked Questions
What are the torque specifications for the wheel lug nuts on the JLG 266 and 307 models?
The standard wheel lug nut torque for the JLG 266, 307, and 266 LoPro models is 300 Nm (221 lb-ft). p. 17
How can I reset fault codes on the JLG 266, 307, or 266 LoPro?
Fault codes are latched and typically reset upon power down of the controller. For specific faults like 'SYSTEM VOLTS LOW' or 'SYSTEM LOCKED OUT CENTER JOYSTICK', the fault is cleared when all three axes of the joystick are set to neutral. p. 119
What is the torque spec for the main control valve mounting bolts on the JLG 266, 307, 266 LoPro telehandler?
The main control valve mounting bolts should be tightened to 25 Nm (18.5 lb-ft) when installing the washers and nuts on the tie rods. p. 85
What is the capacity of the hydraulic reservoir for the JLG 266 and 266 LoPro models?
The hydraulic reservoir capacity to the FULL mark for the 266 and 266 LoPro models is 65 liters (17 gallons). p. 18
What is the torque spec for the engine coupler and flex plate bolts on a JLG 266, 307, 266 LoPro telehandler?
The engine coupler and flex plate bolts must be torqued to 210 Nm (155 lb-ft). p. 69
What do I get after purchasing this JLG 266 manual?
One searchable PDF covering 126 pages, delivered instantly. No disc, no shipping, no waiting on the post.
Can I print specific sections of this JLG 266 Service Manual?
Print away. There is no DRM and no page limit. Many buyers print one chapter at a time and leave the rest on a tablet.
Reviews
There are no reviews yet.