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Part of the John Deere Repair Manuals.
This is the complete John Deere factory technical repair manual (TM1353) for the 4050, 4250 and 4450 QUAD-RANGE and Power Shift tractors. Across 1,671 pages it walks through every major system: splitting the tractor to access the engine and drivetrain, rebuilding the diesel engine from cylinder head to crankshaft, servicing the QUAD-RANGE and Power Shift transmissions, repairing the MFWD axle and clutch, overhauling the main hydraulic pump and rockshaft, and tracing the full electrical system with wiring diagrams. It is the same information a John Deere dealer technician works from, with all the torque values, fluid capacities and test pressures called out so a repair is done to spec the first time.
What's Inside This John Deere 4050-4450 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General | Predelivery and After-Sale Inspection, Tune-Up, Lubrication, Safety, Specifications | |
| Tractor Separation | Front Axle, Front-End Separation, Front-End and Engine Separation, SOUND-GARD Body and ROLL-GARD Structure, Power Shift Clutch Housing, QUAD-RANGE Clutch Housing, Transmission, Final Drives, Hi-Crop Final Drives | |
| Engine | Cylinder Head, Valves and Camshaft, Cylinder Block, Liners, Pistons and Rods, Crankshaft, Main Bearings and Flywheel, Lubrication System, Cooling System | |
| Fuel and Air System | Air Intake System, Diesel Fuel System, Speed Control Linkage | |
| Electrical System | Harness Replacement, Connector Repair, Delco-Remy Charging Circuit, John Deere Charging Circuit, Starting Circuit, Lighting Circuit, INVESTIGATOR II Warning System, Digital Tachometer, Gauge Cluster Instrumentation, Analog Tachometer, Accessories Circuit | |
| Power Train - Perma Clutch Transmission | Clutch Oil Pressure Valve Housing, PERMA CLUTCH, QUAD-RANGE Planetary (4050/4250/4450), Eight-Speed Transmission and Charge Pump, PTO Gear Train (with and without MFWD), Differential, Differential Lock Valve, Final Drive, Hi-Crop Final Drive, MFWD Gear Train and Clutch, MFWD Axle | |
| Power Train - Power Shift Transmission | Traction Clutch Valve Housing, Transmission Control Valve Housing, Traction Clutch and Drive Shafts, Input Planetary, Reduction Gear Train, Output Planetary, Speed Selector Assembly, Charge Pump Assembly, PTO Gear Train, Differential, Differential Lock Valve, Final Drive, Hi-Crop Final Drive, MFWD Gear Train, MFWD Clutch, MFWD Axle and Final Drive | |
| Steering and Brakes | Power Steering Components, Steering Column, Metering Pump, Steering Valve, Steering Motor, Dual Piston Steering Motor, Steering Assist Cylinders (MFWD), Brake Valve, Brake Accumulator, Bleeding Brakes, Brake Pistons, Plates and Disks | |
| Hydraulics | Main Hydraulic Pump, Oil Filter Relief Valve Housing, Hydraulic Attenuator, HYDRACUSHIONED Seat Valve, Pressure Control Valve, Rockshaft Components, Lift Assist Cylinders, Draft Sensing Components, Hitch Components, SCV and ISO Coupler, Remote Cylinder, Hydraulic Oil Cooler, Thermal Bypass Valve, Transmission-Hydraulic System Cleanup | |
| Miscellaneous | Rear Wheels, Front Axle | |
| Operator Station | Air Conditioning System, Air Conditioning Service, Heating System, Seat | |
| Miscellaneous Options | Auxiliary Lighting and Electrical Components, Digital Tachometer Ground Speeds, Auxiliary Trailer Brake, Secondary Brake, Auxiliary Steering System | |
| Special Tools | Special Tool Index and Part Numbers |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 4050 (Serial No. -006509) | ||
| PTO Horsepower at 2200 rpm (4050 early) | 75 kW (100 hp) | |
| 4250 | ||
| PTO Horsepower at 2200 rpm (4250) | 90 kW (120 hp) | |
| 4450 | ||
| PTO Horsepower at 2200 rpm (4450) | 104 kW (140 hp) | |
| All Models | ||
| Engine Crankcase Capacity | 17.0 L (18 qt) | |
| Fan Belt Tension | 375 to 425 N (85 to 95 lbs.) | |
| Clutch Housing-to-Engine Torque | 407 N-m (300 ft-lbs) | |
| 4250 and 4450 | ||
| Cooling System Capacity | 25.6 L (27 qt) | |
| 4050 (Serial No. 006510-) | ||
| Compression Test (minimum) | 2400 kPa (24 bar / 350 psi) minimum | |
| Power Shift Models without MFWD | ||
| Transmission-Hydraulic System Capacity (Power Shift without MFWD) | 51.0 L (13.5 gal) | |
John Deere 4050-4450 Common Problems This Manual Covers
Sudden loss of hydraulics, power steering and brakes on 4450.
This is the classic charge pump pressure line rupture in the rear end. The Hydraulics section covers removing and inspecting the main hydraulic pump and all pressure lines, while the Steering and Brakes section covers bleeding the brake accumulator and testing system pressure after repair. Replace the line with the correct OEM hose rating, then bleed and test the brake accumulator per the manual's pressure specification before using the tractor under load again.
Manual Section: HydraulicsRod or main bearing failure with oil that looks like chocolate milk
Coolant contamination in the engine oil is the cause - typically a weeping head gasket or cracked liner seat that allows coolant to migrate into the crankcase. The Engine section covers cylinder head removal, liner inspection and crankshaft/bearing replacement so you can assess how far the damage progressed. Flush the oil system, inspect each bearing journal for corrosion pitting, and pressure-test the cooling system before reassembly to confirm the coolant source is eliminated.
Manual Section: EngineMFWD leaking at front hub where the shaft enters the knuckle
The knuckle shaft seal is a known wear point on the MFWD axle on these tractors. The Power Train sections cover MFWD axle and final drive removal, seal replacement and reassembly torques. Replace both sides at the same time since a leak on one side usually means the other seal is not far behind, and confirm the axle pivot pin bushings are within spec while the axle is out.
Manual Section: Power Train - Perma Clutch TransmissionMFWD engages erratically or will not disengage reliably
Faulty solenoid or a worn MFWD engagement switch is the most common cause. The Power Train - Power Shift Transmission section covers the MFWD clutch and gear train disassembly, and the Electrical System section covers accessory circuit diagnosis so you can confirm whether the fault is mechanical in the clutch pack or electrical in the solenoid before dismantling the front axle.
Manual Section: Power Train - Power Shift TransmissionFrequently Asked Questions
What PTO horsepower do the John Deere 4050, 4250 and 4450 produce?
Factory specs list 75 kW (100 hp) for the early 4050 and 78 kW (105 hp) for the later 4050, 90 kW (120 hp) for the 4250 and 104 kW (140 hp) for the 4450, all measured at 2200 engine rpm. The manual also lists the Economy Power (4050E, 4250E) variants with higher output for specific conditions.
How do I split a John Deere 4050 or 4450 tractor for transmission or engine work?
The Tractor Separation section covers the full sequence: disconnecting hydraulic lines, the MFWD driveshaft, electrical harness and then separating the front-end from the clutch housing or the clutch housing from the transmission. Follow the separation steps in order - skipping the sequence is the most common cause of damaged harness connectors and bent steering lines on these tractors.
Why would a John Deere 4450 suddenly lose hydraulics, power steering and brakes at the same time?
That symptom almost always points to a ruptured charge pump pressure line in the rear of the tractor. The Hydraulics section covers removing and replacing the hydraulic pump and its pressure lines, and the Steering and Brakes section covers bleeding and testing the brake accumulator after the line is repaired so you can confirm full system pressure before returning the tractor to work.
What are the transmission and hydraulic fluid capacities for these tractors?
The Power Shift system holds 51.0 L (13.5 gal) without MFWD and 60.0 L (15.9 gal) with MFWD. The QUAD-RANGE system holds 60.5 L (16.0 gal) without MFWD and 65.0 L (17.2 gal) with MFWD. The engine crankcase takes 17.0 L (18 qt) on all models. Using the correct John Deere Hy-Gard fluid and changing it on schedule prevents the overheating that leads to expensive pump and valve failures.
Does TM1353 cover the MFWD axle and Power Shift transmission?
Yes. Both the Power Shift and QUAD-RANGE transmissions have their own dedicated sections with full overhaul procedures, and the MFWD gear train, clutch and axle repair are covered in both sections. The manual also covers MFWD solenoid and switch diagnosis so you can sort out engagement problems without pulling the front axle unnecessarily.
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