John Deere 8120 8220 8320 8420 8520 Tractor Operation and Test Manual

John Deere 8120 8220 8320 8420 8520 Tractor Operation and Test Manual

This is the John Deere 8120 8220 8320 8420 8520 Tractor Operation and Test Manual, as a PDF. It runs to 3,413 pages in 16 parts.

It covers the John Deere 8120, 8220, 8320, 8420 and 8520 tractors. It is John Deere's operation and test manual: how each system works and how to test it.

About the John Deere 8120 tractor

Tractors are kept running for decades, and the factory manual is what lets a mechanic rebuild the transmission, set the hydraulic lift or trace an electrical fault correctly.

What is inside

Its chapters cover the engine, the fuel system, the transmission and drivetrain, brakes, the hydraulic system, the electrical system, steering, the PTO and troubleshooting and fault codes. The largest sections are 211 Service Codes (10 pages), 245 Control Units (2 pages) and 246c Ag Management Solutions (Ams) Autotrac (2 pages).

• 210 General
• 211 Service Codes (10 pages)
• 212 Observable Symptoms (1 page)
• 213 System Diagnosis (1 page)
• 220 Engine
• 230 Fuel and Air
• 240 Electrical (1 page)
• 245 Control Units (2 pages)
• 246a Ag Management Solutions (Ams) Greenstar
• 246b Ag Management Solutions (Ams) Jdlink
• 246c Ag Management Solutions (Ams) Autotrac (2 pages)
• 246d Ag Management Solutions (Ams) Field Doc
• 250 Powershift Transmission (2 pages)
• 256 Drive Systems
• 260 Steering and Brakes (1 page)
• 270 Hydraulic System (1 page)

What you can do with it

• Understand how each system works
• Run the diagnostic tests in the right order
• Compare readings with the factory specifications
• Find the fault before replacing parts

Who it is for

Farmers who repair their own equipment, farm workshops, independent agricultural mechanics and dealers.

Make sure it is your machine

Check the model and serial number on your machine before ordering. Some manuals only cover a range of serial numbers.

Questions about this manual

Which machines does this manual cover?
The John Deere 8120, 8220, 8320, 8420, 8520. If your machine has a different model number, look for the manual for that model.

Is it the original manufacturer manual?
Yes. It is John Deere's own diagnostic manual, not a third-party reprint or a summary.

How many pages does it have?
3,413 pages, in 16 parts listed above.

How do I receive it?
It is a PDF. After payment it is available to download from your account, and you can read it on a computer, tablet or phone or print the pages you need. No printed book is shipped.