Part of the John Deere Repair Manuals.
A Syncro-Range transmission that drops out of gear under load will not fix itself on a Saturday afternoon. The John Deere 2520 technical manual PDF, factory document TM1004, runs 312 pages on this tractor, from predelivery and tune-up through final drive teardown. Wiring diagrams map the charging, starting, ignition, and lighting circuits back to the battery, so a dead accessory gets traced instead of replaced on a hunch. Hydraulics claim the largest run of the book, covering the main reservoir, filters, pumps, power brakes, rockshaft, 3-point hitch, and the selective control valves feeding your remote cylinders. Set alternator belt tension to 20 lbs. at 3/4 in. deflection, and confirm 3-1/2 to 4-1/2 psi at the fuel pump before you blame the injection pump. Guessing bills you twice: wrong part, second teardown. Bookmarked and text searchable, it downloads once and stays yours for as long as the 2520 works your ground.
What's Inside This John Deere 2520 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-28 | Specifications, Predelivery, Delivery, And After-Sale Services, Tune-Up, Lubrication, Separation |
| Engine | 29-72 | General Information, Diagnosis, And Tests, Cylinder Head and Camshaft, Cylinder Block, Liners, Pistons, And Rods |
| Fuel Systems | 73-96 | Diagnosing Malfunctions, Diesel Fuel System, Gasoline Fuel System |
| Electrical System | 97-144 | Information and Diagrams, Charging Circuit, Starting Circuit, Ignition System, Lighting and Accessory Circuits |
| Power Train | 145-222 | Syncro-Range Transmission and PTO Clutches, Syncro-Range Transmission, Engine Disconnect Clutch, Power Shift Transmission, Differential, Final Drive, Hi-Crop Final Drive |
| Steering and Brakes | 223-224 | Steering Valve, Steering Motor, Power Brakes, Brake Accumulator, Operating Valve, Cylinder |
| Hydraulic System | 225-308 | General Information, Diagnosis, And Tests, Main Reservoir, Filter, Valves, Oil Cooler, And Oil Reservoir |
| Miscellaneous | 309-312 | Front Axle |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Check alternator belt tension | 20 lbs. at 3/4 in. belt deflection | p. 17 |
| Fuel pump pressure | 3-1/2 to 4-1/2 psi | p. 77 |
| Battery Cold Cranking Amps (0°F) | 430 Amps | p. 98 |
| Battery Cold Cranking Amps (-20°F) | 330 Amps | p. 98 |
| Start-safety switch voltage drop | 0.1 volt Max. | p. 132 |
| Oil Cooler Relief Valve pressure (warm) | 80 to 100 psi | p. 234 |
| Oil Cooler Relief Valve pressure (cold) | 140 to 160 psi | p. 234 |
| Diesel Valve Clearance (Intake) | 0.014 in. | p. 5 |
| Diesel Valve Clearance (Exhaust) | 0.018 in. | p. 5 |
| Gasoline Valve Clearance (Intake) | 0.014 in. | p. 5 |
| Gasoline Valve Clearance (Exhaust) | 0.022 in. | p. 16 |
| Hydraulic System Standby Pressure | 2250 psi | p. 7 |
