Part of the John Deere Repair Manuals.
TM1259 (01Sep87) is the Operation and Tests volume for the John Deere 4050, 4250, 4450, 4650 and 4850. It gives the specifications, tests and step-by-step diagnosis for each system.
The book covers hydraulic standby, PTO clutch, Quad-Range lube, fuel supply and compression pressures.
This is not the repair book. For teardown you need TM-1353 (4050, 4250, 4450), TM-1354 (4650, 4850), CTM1 for the 6466 engines and CTM7 for the radial piston pumps.
What's Inside This John Deere 4050–4850 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information and Safety | 1-20 | Contents, Introduction, Safety, Tractor Cutaway View |
| Engine Operation and Tests | 21-46 | Cooling and Lubrication Systems, Compression, Valve Clearance and Oil Pressure Tests, Dynamometer Test, Engine Malfunction Diagnosis |
| Fuel and Air Systems | 47-100 | Air Intake and Manifold Pressure, Fuel Tank Capacities, Fuel Supply Pump, Injection Pump Speeds, Injection Nozzle Diagnosis |
| Electrical System Phase I | 101-136 | Batteries, Harness Locations, Wiring Diagrams, Circuit Lists |
| Electrical System Phase II | 137-178 | Harness Locations, Wiring Diagrams, Circuit and Ground Lists |
| Electrical Diagnosis | 179-352 | Starting Circuit, Charging Circuit, Investigator Ii, Gauges, Lighting, Accessories, Radio, MFWD |
| Electrical Circuit Operation | 353-418 | Alternators, Starter, Lighting, Investigator Ii, Gauges, Accessories, Radar |
| Quad-Range Transmission Operation | 419-484 | Quad-Range, Perma-Clutch, Planetary, Transmission, Pump, Valves, Differential, Syncro-Range |
| PTO and Quad-Range Diagnosis | 485-500 | PTO Operation, Clutch Pressure, Lube Pressure and PTO Tests |
| MFWD for Quad-Range | 501-512 | Mechanical Front Wheel Drive, MFWD System Operation, MFWD Clutch Operation, Limited Slip Differential, MFWD Slippage |
| Power Shift Transmission Operation | 513-590 | Mechanical Operation, Hydraulic Controls, PTO, Differential |
| Power Shift Transmission Diagnosis | 591-654 | Test Tools, Procedure, Pressure Checks, Record Sheets |
| MFWD for Power Shift | 655-668 | Mechanical Front Wheel Drive, MFWD Driver Gear Set, MFWD Idler Gear Shaft, MFWD Clutch Operation, Differential Operation |
| Power Steering | 669-700 | 4050, 4250 and 4450 and 4650 and 4850 Steering Components, Hydraulic Circuits, Diagnosis |
| Power Brakes | 701-714 | Brake Operation, Diagnosis |
| Hydraulic System and Circuit Diagrams | 715-768 | Transmission Hydraulic Circuit Diagrams, JIC High and Low Pressure Circuit Diagrams, Main Hydraulic Pump |
| Hydra-Cushioned Seat | 769-780 | Seat Specifications, Operation, Diagnosis |
| Rockshaft | 781-874 | Rockshaft Operation and Tests for 4050, 4250 and 4450 and for 4650 and 4850 |
| Selective Control Valves | 875-898 | SCV Flow Rate, Operation, Tests |
| Quad-Range Hydraulic Diagnosis | 899-938 | Step-By-Step Hydraulic Diagnosis, Standby Pressure, Pressure Control Valve |
| Power Shift Hydraulic Diagnosis | 939-980 | Power Shift Transmission Hydraulic Diagnosis |
| Air Conditioning and Heating | 981-1048 | Refrigerant Cycle, Specifications, System Tests, Heater |
| Special Tools | 1049-1086 | Purchased and Fabricated Tools, Test Equipment Calibration |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine by model | 6466D (4050); 6466T (4250, 4450); 6466A (4650, 4850) | p. 26 |
| Compression pressure | 3000-3410 kPa (30-34.1 bar) (435-495 psi) 4050; 2690-3100 kPa (26.9-31 bar) (390-450 psi) 4250; 2450-2860 kPa (24.5-28.6 bar) (355-415 psi) 4450, 4650 and 4850 | p. 26 |
| Valve clearance | 0.41-0.51 mm (0.016-0.020 in.) intake; 0.66-0.76 mm (0.026-0.030 in.) exhaust | p. 26 |
| Engine oil pressure | 280-400 kPa (2.8-4.0 bar) (41-58 psi) | p. 26 |
| Engine speeds, dynamometer test | 850 rpm slow idle; 2375 rpm fast idle; 2200 rpm full load | p. 27 |
| PTO power at 2200 rpm, kW (hp) | 75 (100) 4050; 89 (120) 4250; 104 (140) 4450; 123 (165) 4650; 142 (190) 4850 | p. 27 |
| Fuel tank capacity | 174L (46 U.S. gal.) 4050; 246L (65 U.S. gal.) 4250 and 4450; 386L (102 U.S. gal.) 4650 and 4850 | p. 56 |
| Fuel supply pump pressure | 24-31 kPa (0.2-0.3 bar) (3.5-4.5 psi) 4050 diaphragm type; 138-172 kPa (1.4-1.7 bar) (20-25 psi) all other engines | p. 56 |
| Fuel injection pump speeds | 2350-2400 rpm fast idle; 830-870 rpm slow idle; 2200 rpm full load | p. 56 |
| Alternator output | 13.2-15.5 volts | p. 228 |
| Main hydraulic pump | 50 cm3 (3.0 cu. in.) 4050, 4250 and 4450; 65 cm3 (4.0 cu. in.) 4650 and 4850 | p. 747 |
| Hydraulic standby pressure test, Quad-Range | 158-162 bar (2300-2350 psi) | p. 930 |
| Pressure control valve test, 800 rpm | 11000-11800 kPa (110-118 bar) | p. 931 |
| Quad-Range clutch pressure | 1100-1170 kPa at 1000 rpm; 1140-1210 kPa at 1500 rpm | p. 492 |
| Quad-Range lube pressure, kPa (bar) (psi) | 180 (1.8) (27) at 1500 rpm and 270 (2.7) (39) at 2000 rpm with oil at 43 °C; 130 (1.3) (19) and 200 (2.0) (29) at 66 °C | p. 494 |
| PTO clutch pressure at 2000 rpm | 1170-1240 kPa (11.7-12.4 bar) (170-180 psi) | p. 499 |
| SCV flow rate range | 11-64 L/min at 1500 rpm, 1500 psi | p. 875 |
| Air conditioning | 1.8 kg (4 lb.) refrigerant R-12; compressor oil 330 mL (11 fl. oz.); discharge pressure 690-2070 kPa (7-20 bar) at 2000 rpm | p. 986 |
