John Deere 5620, 5720 and 5820 Tractors Diagnosis and Tests Manual (TM4791)

TM4791 is the manual a technician reaches for when a 5620, 5720 or 5820 has a fault that isn't obvious. It explains how each system is supposed to work and gives you the tests and specified values to prove which part has failed, before you take anything apart or start swapping parts on a hunch.

Fits

John Deere 5620, 5720 and 5820 tractors, 2WD or MFWD, with PowrQuad or PowrQuad Plus transmission. Manual dated April 2006. Wiring harness diagrams are split at serial number 424816.

What this manual covers

A full section covers the electronic control units: the BCU (basic control unit), BIF (basic informator), EPC (PowrQuad Plus control unit) and PRF (performance monitor), along with the data bus that links them. Other sections cover engine operational checks, tests and adjustments, the fuel, air intake and cooling systems, electrical circuit checks and functional schematics, PowrQuad and PowrQuad Plus transmission diagnosis, drive systems, steering and brakes, hydraulics, the cab, and a special tools list. Test values and diagnostic charts are the focus throughout.

Table of contents

• Section 210 - General Information - safety measures, general references
• Section 220 - Engine - operational checks, tests and adjustments
• Section 230 - Fuel, Air Intake and Cooling Systems - tests, adjustments, theory of operation
• Section 240 - Electrical System - circuit checks, component testing, wiring harnesses (serial break at 424816)
• Section 245 - Electronic Control Units - BCU, BIF, EPC and PRF diagnostics, data bus theory
• Section 255 - PowrQuad and PowrQuad Plus Transmissions - transmission diagnosis
• Section 256 - Drive Systems - driveline diagnosis
• Section 260 - Steering and Brakes - diagnosis and tests
• Section 270 - Hydraulic System - diagnosis and tests
• Section 280/290 - Miscellaneous, Operator's Cab - cab systems
• Section 299 - Special Tools - diagnostic tool reference

Check before you buy

Check your serial number against the 424816 break before you use the harness diagrams. This is a diagnosis manual only; repair procedures are in the separate repair technical manual.

PDF, English. You get the download link right after checkout. Sold by an independent seller, not affiliated with or endorsed by John Deere.