Straight from JLG's own service literature, document 31200151 is the factory book for the G6-42A, G9-43A, and G10-43A telehandlers, and this JLG G6-42A, G9-43A, G10-43A service manual PDF gives you all 244 pages of it. The electrical section alone runs close to a third of the book: complete system schematics, circuit breakdowns for the start and charging circuits, joystick fault codes, and Cummins SAE diagnostic trouble codes. Hydraulic pressure diagnosis traces each circuit from the implement pump through the control valves to the cylinders, with engine coverage for John Deere, Perkins, and Cummins. When you service the boom, torque the compensation cylinder lock bolts to 100-110 lb-ft, and fill the reservoir to 20 gallons on the G6-42A or 23.3 on the 43A machines. Guessing costs real money: a wrong part, a second teardown. Bookmarked and text-indexed, this file travels to whatever jobsite the machine does; grab your copy and keep it there.
What's Inside This JLG G6-42A, G9-43A, G10-43A Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Practices | 9-12 | Introduction, Disclaimer, Operation & Safety Manual, Do Not Operate Tags, Safety Information, Safety Instructions, Safety Decals |
| General Information and Specifications | 13-38 | Replacement Parts and Warranty Information, Torque Charts, Specifications, Fluid and Lubricant Capacities, Service and Maintenance Schedule, Lubrication Schedule |
| Boom | 39-72 | Boom System Component Terminology, Boom System - Three Section, Boom Assembly Maintenance, Complete Boom Removal/Installation, Boom Section Removal/Installation |
| Cab and Covers | 73-86 | Operator Cab and Covers Component Terminology, Operator Cab, Cab Components, Cab Removal, Cab Installation |
| Axles, Drive Shafts, Wheels and Tires | 87-100 | Axle, Drive Shaft and Wheel Component Terminology, Axle Assemblies, Drive Shafts, Wheels and Tires, Brakes, Towing a Disabled Machine |
| Transmission | 101-114 | Transmission Assembly Component Terminology, Transmission Serial Number, Transmission Specifications and Maintenance Information, Transmission Replacement, Engine Drive Plate |
| Engine | 115-132 | Introduction - John Deere, Introduction - Perkins, Introduction - Cummins, Engine Cooling System, Engine Electrical System, Fuel System, Engine Exhaust System, Air Cleaner Assembly |
| Hydraulic System | 133-162 | Hydraulic Component Terminology, Safety Information, Hydraulic Pressure Diagnosis, Hydraulic Circuits, Hydraulic Reservoir, Implement Pump, Control Valves, Hydraulic Cylinders |
| Electrical System | 163-244 | Electrical Component Terminology, Specifications, Safety Information, Fuses and Relays, Electrical System Schematics, Circuit Breakdowns, Engine Start Circuit, Charging Circuit |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Battery Reserve Capacity | 1000 Cold Cranking Amps @ 0° F (-18° C) | p. 25 |
| Alternator (with Optional A/C) | 12V, 65 Amps (12V, 105 Amps) | p. 25 |
| Hydraulic System Reservoir Capacity (G6-42A) | 20 gallons (75,7 liters) | p. 29 |
| Hydraulic System Reservoir Capacity (G9-43A & G10-43A) | 23.3 gallons (88,2 liters) | p. 29 |
| compensation cylinder, pins and bolts | 100-110 lb-ft (135-149 Nm) | p. 43 |
| lift/lower cylinder, pin and lock bolt | 200-215 lb-ft (271-291 Nm) | p. 43 |
| wheel lug nut torque | 350-400 lb-ft (475-542 Nm) | p. 98 |
| manual release screw adjustment | 1.26 in (32 mm) | p. 99 |
| Transmission filter torque | 20-25 lb-ft (27-34 Nm) | p. 106 |
| Transmission overheating threshold | 248° F (120° C) | p. 109 |
| Engine Oil Capacity (John Deere, Before S/N 0160007869) | 14.5 quarts | p. 27 |
| Engine Oil Capacity (Cummins) | 7.6 quarts | p. 27 |
JLG G6-42A, G9-43A, G10-43A Common Problems This Manual Covers
JLG G6-42A transmission will not engage reverse, drivetrain response weak after warm-up
Check transmission oil level with the engine idling and oil warm; low or contaminated oil kills clutch pressure first. Drain and refill, then replace the filter and torque it to 20-25 lb-ft (27-34 Nm) as shown on page 106. If reverse still fails, run the clutch pressure checks in the transmission section beginning on page 101.
Manual Section: Transmission p. 106Parking brake will not hold machine on a grade even with engine off
Verify the manual release screw setting first and adjust it to 1.26 in (32 mm) as detailed on page 99 before condemning the brake. Check brake engagement with the axle troubleshooting charts, then inspect friction surfaces for internal wear or oil contamination if adjustment does not restore holding power on grade.
Manual Section: Axles, Drive Shafts, Wheels and Tires p. 99Transmission temperature gauge climbs into the red during long loaded pushes uphill
Check oil level with the machine cold and again warm, and confirm the correct fluid type; low oil is the top cause. Shut down before oil passes 248° F (120° C), the overheating limit noted on page 109. Inspect the cooler for plugged fins and flush it if flow is restricted.
Manual Section: Transmission p. 109Fork tilt, auxiliary hydraulics, and de-clutch functions stop working with low battery voltage fault
Test battery voltage and load-test the battery; it must deliver 1000 cold cranking amps at 0° F (-18° C) per the spec on page 25. Check the 150A alternator power fuse and charging output next. Match the active code against the error code reference beginning before replacing any module.
Manual Section: Electrical SystemBoom extends unevenly and extension chains droop or slap inside the boom sections
Inspect chain tension and wear pads using the boom troubleshooting procedures starting on page 68. Check the lift/lower cylinder pin lock bolt while the boom is supported; it takes Loctite 242 and 200-215 lb-ft (271-291 Nm), covered in the boom service procedures on page 43. Replace pads worn past limits.
Manual Section: Boom Troubleshooting p. 68Frequently Asked Questions
What are the torque specifications for the wheel lug nuts on the JLG telehandler?
The standard wheel lug nut torque for the JLG telehandler is 350-400 lb-ft (475-542 Nm). p. 26
What is the engine oil capacity for a G6-42A John Deere engine before serial number 0160007869?
For a G6-42A John Deere engine before serial number 0160007869, the engine crankcase oil capacity with a filter change is 14.5 quarts (13,7 liters). p. 27
What is the procedure for checking the chain tension on a G6-42A model?
To check chain tension, extend the boom 4 to 5 ft (1,2 to 1,5 m), then fully retract it. Measure dimension 'A' at the boom head, which should be 11.625 to 11.938 in (295,2 to 303,2 mm). p. 58
What is the torque spec for the main control valve mounting bolts on the JLG G6-42A, G9-43A, G10-43A telehandler?
The main control valve is secured to the frame with three bolts, washers, and nuts. While the manual does not provide a specific torque for these mounting bolts, it specifies that the main control valve assembly must be installed onto the frame by aligning the bolts with the holes in the end sections and tightening them. p. 151
What is the torque specification for the transmission-to-engine mounting bolts on the G6-42A?
The eight bolts holding the transmission to the engine should be torqued to 53 lb-ft (72 Nm). p. 105
How is this JLG G6-42A Service Manual delivered?
Instant PDF download. You get the full 244-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
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Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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