Part of the John Deere Repair Manuals.
Which feed roll procedure belongs to which machine is the sort of question only the factory book settles, and TM1203 answers it across 491 pages covering all four John Deere forage harvesters in the 3940 through 3970 range. The hydraulic section of this John Deere 3950 technical manual PDF opens with system components diagrams for the 3940/3960 and the 3950/3970, then works through the electrohydraulic valve, cutterhead lift system, hydraulic downstop and spout cap cylinder. On the electrical side, harness repair, functional checks and wiring diagrams run from component location through IRON-GARD metal detector, SPOUT-TRAK and ROW-TRAK, while Diagnosing Malfunctions charts front nearly every system section and point you at the test before the teardown. Set shifting fork-to-case clearance to 0.060 in. (1.52 mm) and fill the feed roll gear case with 3 qt (2.8 L). Nobody enjoys pulling the cutterhead twice in chopping season. Bookmarked by section and sharp enough to print, it is bought once and yours for as long as you run this harvester.
What's Inside This John Deere 3940, 3950, 3960, 3970 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 7-30 | Safety, Specifications |
| Drive Train | 31-140 | Diagnosing Malfunctions, PTO Hookup-Recirculating Ball Slip, PTO Hookup-Non-Metallic Bushing Type, PTO Hookup-Grobe Spline Type, Powershaft, Bevel Gear Case, Feed Roll Gear Case |
| Hydraulic System | 141-238 | Diagnosing Malfunctions, Electrohydraulic Valve, Tongue Position Cylinder, Hydraulic Shift Cylinders, Cutterhead Lift System, Hydraulic Downstop, Spout Cap Cylinder |
| Electrical System | 239-322 | Component Location, System Functional Checks and Diagnosing Malfunctions, Tests and Adjustments, Harness Repair, Iron-Gard Metal Detector, Spout-Trak, Downstop and Float Systems |
| Cutterhead Assembly | 323-452 | Diagnosing Malfunctions, Feed Rolls-3940/3960, Feed Rolls-3950/3970, Smooth Roll Scraper-Stationary Knife and Adjuster, Radius and Feed Roll Arms, Knife Sharpener |
| Miscellaneous | 453-482 | Auger, Wheels, Fan and Spout |
| Dealer Fabricated Tools | 483-486 | Cutterhead Stands, Angle, Pipe, Plate |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 3940/3960 | ||
| Knife Adjuster Nut (Original Style) | 70 lb-ft (95 N·m) | p. 393 |
| Adjuster Rod Nut-to-Slotted Nut (Original Style) | 85 lb-ft (115 N·m) | p. 393 |
| All Models | ||
| Shifting Fork-to-Case Clearance | 0.060 in. (1.52 mm) | p. 95 |
| Countershaft End Play | 0.070 in. (1.78 mm) | p. 95 |
| Smooth roll shaft TIR tolerance | 0.006 in. (0.152 mm) | p. 369 |
| Smooth roll TIR tolerance at top length | 0.015 in. (0.380 mm) | p. 369 |
| Fan Mounting Nuts Torque | 85 lb-ft (115 N·m) | p. 469 |
| End of Fan Blade-to-Band Clearance | 0.040-0.080 in. (1-2 mm) | p. 469 |
| Side of Fan Blade-to-Sidesheet Clearance | 0.30-0.40 in. (7-10 mm) | p. 469 |
| Bevel Gear Case (One Piece) Input Shaft Rolling Torque | 5-10 lb-in. (0.7-1.4 N·m) | p. 86 |
| 3950/3960/3970 | ||
| Rear Sheave Hub Cap Screw Torque | 85 lb-ft (115 N·m) | p. 469 |
