Part of the John Deere Repair Manuals.
An hour from now you could have the injection pump timed to the same numbers Deere handed its dealers, because the John Deere 820 Technical Manual PDF (TM4212) puts all 332 pages of factory tractor service data in front of you. Wiring diagrams trace the Bilux and sealed beam lighting circuits, hydraulic schematics map the rockshaft and selective control valves, and troubleshooting tables walk each system from symptom to cause. Exploded views carry the collar-shift transmission, differential, final drives, and PTO shafts through teardown and reassembly. Set front wheel bolts to 85 ft.lbs., pull the front support cap screws to 170 ft.lbs., and hold impeller clearance within 0.005 in. A rockshaft that lets the hitch settle overnight stops being a guessing game once you have the pressure test values. Bookmarked and text searchable, this download is yours to keep for every season the 820 works your ground.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 5-30 | Specifications, Pre-Delivery, Delivery and After-Sales Inspections, Lubrication and Periodic Service, Engine and Tractor Tune-Up and Adjustment, Separation |
| Engine | 31-88 | Cylinder Head and Camshaft, Cylinder Block, Liners, Pistons and Connecting Rods, Crankshaft, Main Bearings and Flywheel, Timing Gear Train, Oil Pump |
| Fuel System | 89-146 | Fuel Tank, Transfer Pump, Fuel Filters, Bosch Fuel Injection Pump, Roto-Diesel Fuel Injection Pump, Roosa Master Model Cb Injection Pump, Roosa Master Fuel Injection Nozzles |
| Electrical System | 147-198 | Diagnosing Malfunctions, Bilux Lighting System, Sealed-Beam Lighting System, Starting Motor, Alternator and Regulator, Generator and Regulator |
| Power Train | 199-244 | Engine Dual-Stage Clutch and Clutch Linkage, Collar-Shift Transmission, Differential Assembly, Final Drives, PTO Shafts |
| Front Axle, Steering System and Brakes | 245-274 | Front Axle, Steering System, Brakes |
| Hydraulic System | 275-322 | Diagnosing Malfunctions, Pressure Tests, Oil Reservoir, Filter and Valves, Hydraulic Pump and Transmission Oil Pump, Rockshaft, Selective Control Valves |
| Miscellaneous | 323-332 | Belt Pulley, De Luxe Seat, Front Wheels |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Maximum torque at 1400 rpm | 92 ft.lbs. (12.7 mkg) | p. 6 |
| Starter | 12 Volts, 4 HP (4 PS) | p. 6 |
| Front wheel bolts | 85 ft.lbs (12 mkg) | p. 19 |
| Clearance between impeller and cover | ±0.005 in. (±0.12 mm) | p. 42 |
| Minimum voltage of solenoid | 8 volts | p. 187 |
| Resistor for low beam headlights | 1 ohm | p. 168 |
| Minimum diameter of commutator | 1.555 in. (39.5 mm) | p. 187 |
| Engine Cylinder Liner Bore | 3.86 in. (98 mm) | p. 6 |
| Engine Stroke | 4.33 in. (110 mm) | p. 6 |
| Engine Maximum Torque at 1400 rpm | 92 ft.lbs. (12.7 mkg) | p. 6 |
| Engine Intake Valve Clearance (hot or cold) | 0.014 in. (0.35 mm) | p. 6 |
| Engine Outlet Valve Clearance (hot or cold) | 0.018 in. (0.45 mm) | p. 6 |
