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 |
John Deere 4050–4850 Series Common Problems This Manual Covers
Engine overheats on a 6466 engine
Work through the engine malfunction table in the Engine Operation and Tests section. It lists a loose or broken fan belt, faulty thermostats, a defective radiator pressure cap and a faulty water pump.
Manual Section: Engine Operation and Tests p. 29Engine has low horsepower, traced to the fuel injection nozzles
The injection nozzle malfunction table in the Fuel and Air Systems section gives four causes and their fixes. Plugged nozzle orifices need repair, and wrong opening pressure needs adjusting. Damaged parts need repair, and a nozzle loose in the head needs tightening.
Manual Section: Fuel and Air Systems p. 93Starter solenoid chatters, and the engine may or may not crank
Go to the starting circuit procedure in the Electrical Diagnosis section. Put an ohmmeter on the solenoid and compare the reading to the 0.6 to 1.0 ohm spec. Outside that range, replace the solenoid.
Manual Section: Electrical Diagnosis p. 211Hydraulic standby pressure out of spec on a Quad-Range tractor
Run the standby pressure test from the Quad-Range Hydraulic Diagnosis section. Spec is 158-162 bar (2300-2350 psi). If it is out, test the pressure control valve, which should read 110-118 bar at 800 rpm. Add shims to raise the pressure or remove shims to lower it, then retest.
Manual Section: Quad-Range Hydraulic Diagnosis p. 930Frequently Asked Questions
Does this manual cover my John Deere 4050, 4250, 4450, 4650 or 4850, and is it a repair manual?
It covers all five models as John Deere technical manual TM1259 (01Sep87), the Tractor Operation and Tests volume with the yellow tabs. It is not the repair manual. Repair (green tabs) is in TM-1353 for the 4050, 4250 and 4450 and in TM-1354 for the 4650 and 4850. Engine repair is in CTM1 for the 6466 engines, and radial piston pump repair is in CTM7. The Phase I and Phase II wiring diagrams are split by tractor serial number. p. 3
What engines and PTO power do the John Deere 4050 to 4850 have?
The 4050 runs the 6466D, the 4250 and 4450 run the 6466T, and the 4650 and 4850 run the 6466A. PTO power at 2200 rpm, kW (hp), is 75 (100) on the 4050, 89 (120) on the 4250 and 104 (140) on the 4450. It is 123 (165) on the 4650 and 142 (190) on the 4850. Engine speeds are 850 rpm slow idle, 2375 rpm fast idle and 2200 rpm full load. Engine oil pressure is 280-400 kPa (2.8-4.0 bar) (41-58 psi). Fuel tanks hold 174L (46 U.S. gal.) on the 4050, 246L (65 U.S. gal.) on the 4250 and 4450, and 386L (102 U.S. gal.) on the 4650 and 4850. p. 27
What are the John Deere 4050 to 4850 hydraulic pressures?
All five use a radial piston variable displacement main pump. It is 50 cm3 (3.0 cu. in.) on the 4050, 4250 and 4450, and 65 cm3 (4.0 cu. in.) on the 4650 and 4850. The Quad-Range standby pressure test spec is 158-162 bar (2300-2350 psi). The pressure control valve test at 800 rpm is 11000-11800 kPa (110-118 bar). SCV flow rate runs 11-64 L/min at 1500 rpm and 1500 psi. p. 747
What John Deere transmission and PTO pressure tests are in TM1259?
Quad-Range clutch pressure is 1100-1170 kPa at 1000 rpm and 1140-1210 kPa at 1500 rpm. Quad-Range lube pressure, kPa (bar) (psi), is 180 (1.8) (27) at 1500 rpm and 270 (2.7) (39) at 2000 rpm with oil at 43 °C. PTO clutch pressure at 2000 rpm is 1170-1240 kPa (11.7-12.4 bar) (170-180 psi). Power Shift tractors get their own transmission diagnosis and hydraulic diagnosis sections, with test tools, pressure checks and record sheets. p. 492
What is inside this manual: wiring diagrams, diagnosis, tests?
You get Phase I and Phase II wiring diagrams with harness locations and circuit lists. Electrical diagnosis walks the starting and charging circuits, INVESTIGATOR II, gauges, lighting and accessories step by step. Transmission hydraulic circuit diagrams and JIC high and low pressure circuit diagrams are included. Step-by-step Quad-Range and Power Shift hydraulic diagnosis is there too, plus engine and injection nozzle malfunction tables. p. 165
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