Part of the John Deere Repair Manuals.
Whether you are turning wrenches on a John Deere 1350, 1550, 1750, 1850, 1850N, 1950, 1950N, 2250, 2450, 2650, 2650N, 2850, 3050, 3350, or 3650 tractor, this 591-page John Deere 2850 technical manual PDF (OEM #TM4446) holds the exact factory instructions to fix it right the first time. Inside, you get complete electrical diagrams for non-cab models, full hydraulic schematics for the hydrostatic steering, and step-by-step troubleshooting for the dual-stage engine clutch. Open to any chapter to find exploded views of the power train, selective control valves, and SG2 cab ventilation systems. Adjust the single-stage engine clutch linkages to a precise 30 mm free play and verify the hydrostatic steering pump output hits 15 MPa at operating temperature. Stop throwing expensive parts at a sluggish rockshaft. Download this bookmarked file right to your tablet, search for the exact spec you need, and get that tractor back in the dirt.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-14 | Prepare for Emergencies, Work in Ventilated Area, Use Proper Lifting Equipment, Handle Fluids Safely, Avoid High-Pressure Fluids, Prevent Battery Explosions |
| Engine | 15-24 | Radiator and Viscous Fan Drive (Specifications, Function of Radiator Cap: Tractors with Expansion Tank, Function of Radiator Cap: Tractors Without Expansion Tank) |
| Fuel and Air Intake System | 25-34 | 05 - Fuel Tank, Auxiliary Fuel Tank and Water Trap, 10 - Cold Weather Starting Aids, 15 - Speed Control Linkage, 20 - Air Cleaner |
| Electrical Diagrams (Without Cab) | 45-74 | 05 - General, 10 - Electrical Diagrams (Without Cab) |
| Circuit Diagnosis (Without Cab) | 75-101 | 15 - Circuit Diagnosis (Without Cab) |
| Electrical Diagrams (with MC1 Cab) | 102-120 | 20 - Sealed-Beam Lighting Equipment (See Ctm-4459), 25 - Electrical Diagrams (with MC1 Cab) |
| Circuit Diagnosis (with MC1 Cab) | 121-157 | 30 - Circuit Diagnosis (with MC1 Cab) |
| Electrical Diagrams (with SG2 Cab) | 158-186 | 35 - Electrical Diagrams (with SG2 Cab) |
| Circuit Diagnosis (with SG2 Cab) | 187-229 | 40 - Circuit Diagnosis (with SG2 Cab) |
| Circuit Diagnosis (with Digital Speed-Hour Meter) | 230-277 | 41 - Electrical Diagrams (with Digital Speed-Hour Meter) |
| Alternator | 278-293 | 45 - Testing Components, 50 - Starting Motor, 55 - Alternator |
| Power Train | 294-398 | 05 - Clutch Operating Linkages, 10 - Single-Stage Engine Clutch, 15 - Dual-Stage Engine Clutch, 20 - Hi-Lo Shift Unit, 25 - Creeper Transmission |
| Steering System and Brakes | 399-445 | 05 - Hydrostatic Steering, 10 - Power Steering, 15 - Manual Steering, 20 - Hydraulic Brakes, 25 - Handbrake, 30 - Hydraulic Trailer Brake |
| Hydraulic System | 446-547 | 05 - Operation and Tests, 10 -Valves, Filters, Oil Cooler and Oil Reservoir, 15 - Hydraulic Pumps, 20 - Rockshaft, 25 - Front Hitch, 30 - Selective Control Valves (Spool Type) |
| Operator'S Cabs | 548-591 | 05 - Air Conditioning System, 10 - Cab Ventilation and Heating System - SG2 Cab, 15 - Cab Ventilation and Heating System - MC1 Cab |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Transmission shift linkages | 30 | p. 2 |
| Fuel tank, auxiliary fuel tank and water trap | 05 | p. 2 |
| Hydraulic pumps | 15 | p. 3 |
| Electrical diagrams (without cab) | 10 | p. 2 |
| Circuit diagnosis (without cab) | 15 | p. 2 |
| Starting motor minimum solenoid voltage | 8 volts | p. 290 |
| Alternator voltage (engine off) | 12 volts | p. 292 |
| Alternator voltage (increasing engine speed) | 13.7 to 14.5 volts | p. 291 |
| Hydrostatic creeper transmission system oil pressure | 19000 kPa (190 bar; 2760 psi) | p. 325 |
| Hydrostatic steering shock valves adjustment pressure | 21000 kPa (210 bar; 3050 psi) | p. 402 |
