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Part of the John Deere Repair Manuals.
Your 4020 has been out of production for decades, but this 378-page John Deere 4000, 4020 Technical Manual PDF (OEM TM1006) still holds every factory procedure for both tractors. Inside: exploded views of the Syncro-Range and Power Shift transmissions, a full troubleshooting section covering diesel, gasoline, and LP-gas fuel systems, and step-by-step teardown procedures from cylinder head to Hi-Crop final drive. You also get tune-up specs, calibration data, and test values for the charging circuit, starting circuit, power steering, and rockshaft hitch. Set differential drive shaft bearing preload at 0.004 to 0.006 inch, then confirm 17 to 27 lbs-inch of drag torque before buttoning it up. Forum threads won't rebuild your Power Shift. This bookmarked PDF opens on any laptop, tablet, or phone; download it and take the whole factory library out to the tractor.
What's Inside This John Deere 4000, 4020 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 5-13 | Predelivery, Delivery, And After-Sale Services, Tune-Up and Adjustment, Lubrication, Separation |
| Engine | 14-38 | General Information and Diagnosis, Cylinder Head, Valves, And Camshaft, Cylinder Block, Liners, Pistons, And Rods |
| Fuel Systems | 39-65 | Diesel Fuel System, Lubrication System, Cooling System, Governor and Speed Control Linkage, LP-Gas Fuel System |
| Electrical System | 66-125 | Information and Diagrams, Motorola Charging Circuit, Delcotron Charging Circuit, Delco-Remy Starting Circuit, John Deere Starting Circuit, Ignition System |
| Power Train | 126-238 | Clutches for Syncro-Range Transmission and PTO, Syncro-Range Transmission, Engine Disconnect Clutch, Power Shift Transmission, Differential, Final Drive, Hi-Crop Final Drive |
| Steering and Brakes | 239-240 | Power Steering, Power Brakes, Steering Valve, Steering Cylinder, Steering Motor, Brake Valve Assembly |
| Hydraulic System | 241-345 | General Information, Diagnosis, And Testing, Main Reservoir, Filter, Valves, Oil Cooler, And Oil Reservoir |
| Miscellaneous | 346-378 | Conventional Front Axle, Power Front Wheel Drive Axle |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Differential drive shaft bearing preload | 0.004-0.006 in. | p. 244 |
| Differential drive shaft bearing drag torque | 17-27 lb-in. | p. 244 |
| Clutch oil manifold hollow dowel I.D. | 1.6225-1.6235 in. | p. 248 |
| Clutch drive shaft bushing I.D. | 0.8765-0.8795 in. | p. 248 |
| Hydraulic system pressure buildup | 2700 psi | p. 274 |
| Valve housing surface flatness limit | Less than 50 millionths of an inch | p. 274 |
John Deere 4000, 4020 Common Problems This Manual Covers
Rockshaft slow to raise, hitch drifts down, or control lever feels loose and sloppy
Adjust the control valve linkage first. No more than 3/16 to 3/8 inch of movement at the valve lever extension should reverse rockshaft rotation, per page 349. Turn the negative stop screw against the transmission case, then back it off 1/8 turn. Verify the friction device needs 5 pounds of force to move the lever, per page 348.
Manual Section: Hydraulic System Diagnosis p. 349Frequently Asked Questions
How do you fix john Deere 4020 rear end howls loudly under load, noise gets worse in higher gears?
Remove the differential and inspect the drive shaft bearings for spalling and wear. Set bearing preload to 0.004 to 0.006 inch and verify drag torque reads 17 to 27 lbs-inch, per the specs on page 244. Torque the idler gear shaft rear nut to 180 ft-lbs, then advance to the nearest castellation and install a new cotter pin. p. 244
How do you fix power Shift transmission slips under load, shifts harsh, or refuses to engage some gears?
Check the clutch pack bushings before condemning the whole transmission. Split the tractor, tear down the Power Shift clutch assembly, and measure the bushing bores. The C1 clutch drum sleeve should read 3.7495 to 3.7505 inches and the C2 clutch shaft bushing 1.1265 to 1.1295 inches, per page 248. Replace anything outside spec. p. 248
How do you fix hydraulic lift jerky and weak with loud pump whine, oil runs hot after short use?
Test standby pressure before pulling the pump; a high-pressure leak to sump in the steering, brakes, or rockshaft circuits mimics a bad pump. Run the diagnostic procedures starting on page 241, then inspect the surge relief valve, which should limit pressure peaks to 2700 psi per page 274. Replace the pump only if it still will not destroke. p. 241
What format is this manual in?
This is a 378-page scanned PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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