John Deere 3940 3950 3960 3970 Forage Harvesters Technical Manual
TM1203
Models Covered:

John Deere 3940 Forage Harvester
John Deere 3950 Forage Harvester
John Deere 3960 Forage Harvester
John Deere 3970 Forage Harvester


Service Technical Manual Covers:

SECTION 10GENERAL INFORMATION
Group 05Safety
Group 10Specifications
Group 15General Information
Group 20Lubricants
SECTION 20DRIVE TRAIN
Group 10Diagnosing Malfunctions
Group 15PTO HookupRecirculating Ball Slip
Group 16PTO HookupNon-Metallic Bushing Type
Group 17PTO HookupGrobe Spline Type
Group 20Powershaft
Group 25Bevel Gear Case
Group 30Feed Roll Gear Case
Group 35Feed Roll Drives
SECTION 30HYDRAULIC SYSTEM
Group 05General Information
Group 10Diagnosing Malfunctions
Group 15Electrohydraulic Valve
Group 20Tongue Position Cylinder
Group 25Hydraulic Shift Cylinders
Group 30Cutterhead Lift System
Group 35Hydraulic Downstop (3940/3960)
Group 40Spout Cap Cylinder
Group 45Spout Control Motor
Group 50Flow Divider Valve
SECTION 40ELECTRICAL SYSTEM
Group 05Component Location
Group 10System Functional Checks and Diagnosing Malfunctions
Group 15Tests and Adjustments
Group 20Harness Repair
Group 25IRON-GARD Metal Detector (3950/3970)
Group 30SPOUT-TRAK (3950/3970)
Group 35Downstop and Float Systems (3950/3970)
Group 40ROW-TRAK (3950/3970)
Group 45Electrical Diagrams
SECTION 50CUTTERHEAD ASSEMBLY
Group 05Diagnosing Malfunctions
Group 10Feed Rolls3940/3960
Group 11Feed Rolls3950/3970
Group 15Smooth Roll ScraperStationary Knife and Adjuster
Group 20Radius and Feed Roll Arms
Group 25Knife Sharpener
Group 30Cutterhead and Bearings
SECTION 60MISCELLANEOUS
Group 05Auger
Group 10Wheels
Group 15Fan and Spout
SECTION 99DEALER FABRICATED TOOLS
Group 05Dealer Fabricated Tools

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