John Deere 4010 and 4020 models Tractors Service Manual (P/N SM-2039)

• Coverage and document identity: John Deere 4010 and 4020 tractors in Row-Crop, Standard, and Hi-Crop configurations; gasoline, LP-Gas, and diesel engines; 4010 Syncro-Range plus 4020 Syncro-Range and Power Shift. This is John Deere Service Manual SM-2039, a 747-page PDF with revision pages dated through April 1967.
• Engine and fuel-system repair: Covers engine removal and installation, cylinder head and valve work, liners, pistons, connecting rods, crankshaft, camshaft, governor, crankcase ventilator pump, lubrication system, and cooling-system testing. Separate chapters handle gasoline and LP-Gas carburetion, the LP converter, diesel filters and transfer pump, injection nozzles, system bleeding, and injection-pump timing.
• Transmission, clutch, and PTO work: Includes Syncro-Range clutch adjustment and overhaul, shifters, synchronizers, shafts, and gears. Power Shift coverage adds operating-pressure tests, control-valve service, C1-C3 and PTO clutch-pack work, planetary-pack disassembly and testing, reduction gears, the parking lock, and the engine disconnect clutch.
• Closed-center hydraulic and steering systems: Details the reservoir, filter, oil cooler, pressure-control and bypass valves, Syncro-Range and Power Shift transmission pumps, main hydraulic pump, system pressure testing, steering valve and motor repair, steering bleeding, power-brake valves and cylinders, and brake disk inspection.
• Implement, axle, and chassis systems: Provides repair procedures for the rockshaft, load-control linkage, 3-point hitch, Quik Coupler, selective control valves, breakaway couplers, remote cylinders, Roll-O-Matic and other front-axle arrangements, wheel bearings, rear axles and final drives, drawbar, seats, sheet metal, and belt pulley.
• Electrical diagnosis, diagrams, and tooling: Covers 12- and 24-volt system tests, ignition, generators, regulators, starters, batteries, lighting, instruments, and serial-specific wiring diagrams. The special-tool section identifies equipment such as the JDG-2 splitting stand, JDE-52 clutch disk aligning set, JDE-50 nozzle service kit, and JDH-series hydraulic and steering tools.

Factory Shop Coverage

John Deere states that this manual was written for Service Department shop use and for training new service personnel. Its repair depth is best matched to trained mechanics and experienced technicians with the lifting equipment, pressure gauges, electrical test gear, and special tools required for tractor splitting and component overhaul. It is a shop manual, not an operator-only maintenance guide.

The transmission chapters make the configuration differences clear. A 4010 uses the Syncro-Range transmission, while the 4020 material covers both Syncro-Range and the hydraulically controlled Power Shift. Beyond removal and assembly, the Power Shift section diagrams power flow in every forward and reverse range, identifies oil-pressure test points, and gives fault checks for poor shifting and torque loss before the clutch and planetary packs are opened.

Serial-Specific Systems and Diagnostic Material

The manual separates 4020 fuel-filter, injection-nozzle, battery, and wiring information at tractor serial 91,000. Lamp-harness drawings are further divided into the 91,000-to-119,000 and 119,000-and-after groups. A Power Shift PTO upper-idler change is identified at serial 160,427, including the revised shaft, gear, thrust washers, lubrication provision, and retrofit assembly information. These breaks matter when selecting parts and following the correct repair section.

Named illustrations include the Diesel Tractor Electrical System (Two-Wire and Split, or Grounded Circuits), Power Shift Oil Pressure Test Points, Oil Flow Through Pump for the main hydraulic pump, the Exploded View of Steering Motor, the Exploded View of Rockshaft Linkage and Control, and model-, engine-, and serial-specific lamp-harness wiring. Troubleshooting charts cover engine, transmission, clutch, electrical, brake, steering, rockshaft, and remote-cylinder complaints with cross-references to the applicable repair groups.

Specifications, Tools, and Repair Limits

Factory tables supply component torque data, fluid capacities, pressure-test specifications, electrical test values, fits, clearances, preload and backlash settings, spring specifications, and new-part dimensions for wear evaluation. Tool coverage goes beyond a simple list: it matches adapters and fixtures to specific jobs, including diesel compression and nozzle testing, clutch alignment, main-pump seal service, rockshaft and selective-control-valve adjustment, steering repair, and safe tractor separation.

The diesel chapter covers injection-pump timing, removal, installation, and system bleeding, but full bench cleaning, inspection, and calibration of the pump are referred to separate John Deere manual SM-2045. One Power Shift PTO caution notes that a displaced upper-idler-shaft quill must seat correctly against the transmission case; incorrect positioning can eliminate thrust clearance and lead to seizure. The diesel-nozzle section also warns that incorrect clamp loading can make the nozzle valve stick or overheat.

Many procedures involve heavy castings, tractor separation, and trapped hydraulic pressure. Use proper stands and lifting equipment, support the tractor securely, and relieve system pressure before disassembly.