All 178 pages of this Case IH 3400 Series Corn Header Service Manual (OEM #84160526) zero in on the 3406, 3408, 3412, 3416, and 3418 headers across the 3400 series. Inside, you get full exploded views of both the pinching and intermeshing gearboxes, a complete slip clutch section covering removal, disassembly, inspection, assembly, and torque slippage checks, and step-by-step feeding row unit procedures. Open to the deck plate section and you'll find the full hydraulic cylinder teardown sequence: head nut removal, rod seal and piston installation, and final torque. Set stalk roll knife tip-to-tip diameter to 100 mm (±0.5 mm) and torque the knife bolts to 80-90 Nm before reinstalling. Corn headers don't wait. Jump to any system by keyword or bookmark, pull it up on your tablet at the machine, and start wrenching.
What's Inside This Case IH 3406-3418 Manual
| System | Pages | Key Topics |
|---|---|---|
| Deck Plate - Exploded View | - | - |
| Deck Plate Hydraulic Cylinder - Assemble | - | Install Rod Seal and Wiper Seal, Install Piston on Rod, Install Rod Assembly in Cylinder Barrel, Install Cylinder Head Nut, Torque |
| Deck Plate Hydraulic Cylinder - Disassemble | - | Remove Cylinder Head Retaining Nut, Remove Cylinder Head Snap Ring, Remove Piston Rod Assembly, Remove Piston From Rod |
| Deck Plate Hydraulic Cylinder - Install | - | Position Cylinder Barrel End, Connect Rod End to Adjusting Bar, Reconnect Hydraulic Hoses, Lower Point and Divider Assembly |
| Deck Plate Hydraulic Cylinder - Overview | - | Deck Plate Hydraulic Cylinder - Remove |
| Deck Plate Hydraulic Cylinder - Visual Inspection | - | Clean and Examine Parts, Remove O-Rings and Seals, Inspect Piston and Cylinder Rod Threads, Repair or Replace Components |
| Deck Plate Indicator - Install | - | Route New Cable, Attach Lower Cable End, Attach Upper Cable End, Adjust Cable Ends |
| Deck Plate Indicator - Remove | - | Lower Feeder Safety Lock, Remove Yoke Cotter Pin and Clevis Pin, Remove Cable From Indicator Bracket, Remove Cable From Header Frame |
| Feeding Row Unit - Assemble - Pinching | - | Install Front Roll Supports, Stripper Plate Lever, Press in Bearing and Seal, Install Stalk Roll Knives, Adjust, Mount Gearbox Assembly, Install Shaft Shields, Drive Chain |
| Feeding Row Unit - Disassemble - Pinching | - | Tensioner Bolt and Spring Assembly, Chain Guide Plate, Tension Sprocket, Stalk-Roll Support, Stalk-Roll, Gearbox |
| Feeding Row Unit - Install | - | Row Unit Positioning, Clamp Installation, Bearing Assembly, Drive Shaft Shields, Drive Chain, Divider and Point Assembly |
| Gathering Chain - Install Aligned Tooth | - | Chain Guide Bolt, Chain Installation, Tensioner Bolt Adjustment, Chain Guide Wear Strip |
| Gathering Chain - Remove | - | Tension Bolt, Front Hood Support Brace Bolt, Gathering Chain |
| Gathering Chain - Troubleshooting | - | Loss of Ear Corn in Field, Pulling Up Corn Stalks |
| Gearbox - Assemble Row Unit Gearbox - Pinching | - | - |
| Gearbox - Disassemble Row Unit Gearbox - Pinching | - | - |
| Gearbox - Exploded View - Intermeshing | - | - |
| Gearbox - Exploded View - Pinching | - | Stalk Roll Drive Shaft, Shim Set, Tapered Roller Bearing, Cover Assembly, Retaining Ring, External, Oil Seal |
| Gearbox - Special Tools | - | Idler Gear Stub Shaft Puller, Shaft Bearing Support Tool, M10 Mm Hex Head Bolt, Bar Stock, Tube Stock, Dimension a |
| Slip Clutch - Assemble - for Row Unit Gearbox Drive | - | Flange, Hub, Lube Fittings, Inner Springs, Outer Springs, Cam Pins |
| Slip Clutch - Check - Torque Slippage (Row Unit) | - | Slip Clutch Torque, Cam Pins, Outer Springs, Inner Springs, Hub Pockets, Internal Housing Walls |
| Slip Clutch - Disassemble - for Row Unit Gearbox Drive | - | Urethane Dirt Excluder Seal Ring, Internal Retaining Ring, Thrust Ring, Clutch Housing, Hub, Cam Pins |
| Slip Clutch - Exploded View - Row Unit | - | Flange, Clamp, Housing, Fitting, Lube, Seal, Retaining Ring, Internal |
| Slip Clutch - Inspect - Internal Components (Row Unit Slip Clutch) | - | Cam Pins, Inner Springs, Outer Springs, Hub, Internal Grease Seal, Clutch Housing Internal Surfaces |
| Slip Clutch - Install, 2200, 2400 Series Pin CBJ038864 and After, All 3200, 3400 Series | - | Clutch, Grade 8 Bolts, Lock Nuts, Bearing Assembly, Drive Chain, Idler Sprocket |
| Slip Clutch - Remove - for Row Unit Drive System | - | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Stalk roll knives tip-to-tip diameter | 100 mm (3.94 in) +/- 0.5 mm (0.020 in) | p. 118 |
| Stalk roll knives bolt torque | 80 - 90 Nm (59 - 66 lb ft) | p. 118 |
| Gathering chain tension (washer and spring tube gap) | 6.4 mm (0.25 in) | p. 146 |
| Drive chain tension (deflection) | 10 - 14 mm (0.39 - 0.55 in) deflection on long span with 2.3 kg (5 lb) of force applied to center of span | p. 173 |
| Drive sprockets to frame gap | 23.3 mm (0.92 in) +/- 1 mm (0.04 in) | p. 122 |
| Sprocket replacement condition | Inspect the sprocket for tooth wear and inner bushing (1) for wear. Replace as required. | p. 84 |
| Stalk roll center line spacing | 101.6 mm (4.0 in) | p. 119 |
| Stalk roll end to front support gap | 0.80 - 1.25 mm (0.03 - 0.05 in) | p. 120 |
| Adjustable plate to frame gap | 1 - 2 mm (0.04 - 0.08 in) | p. 122 |
| Right plate gap at front | 27.4 mm (1.08 in) ± 1 mm (0.04 in) | p. 122 |
| Gearbox grease fill level (CASE IH CORN HEAD GREASE) | 25.4 mm (1.0 in) below top of gearbox at the hole | p. 123 |
| Chain case oil type and volume | 1.48 l (3.1 US pt) of 80W 90 gear oil | p. 128 |
Case IH 3406-3418 Common Problems This Manual Covers
Case IH 3406 corn header pulls in too much trash and stalks break at deck plates p. 119
Measure stalk roll center line spacing on page 119 and verify it is exactly 101.6 mm (4.0 in). Inspect the roller knife gap on page 121 and set clearance to 0.5 mm (0.02 in) to prevent stalk breakage.
Manual Section: Pulling up corn stalksOutside row unit stalk rollers and gathering chains completely stopped turning during field operation p. 128
Drain the chain case and refill with 1.48 l (3.1 US pt) of oil as shown on page 128. Inspect the row unit gearbox on page 123 and verify the grease fill level is 25.4 mm (1.0 in) below the top of the gearbox.
Manual Section: Gearbox - Exploded View - PinchingGathering chain jumps teeth on the sprocket or sags excessively during heavy corn intake p. 146
Adjust the gathering chain tension on page 146 until the washer and spring tube gap is 6.4 mm (0.25 in). Measure the chain over 12 pitches. Replace the assembly if it reaches the roller chain wear limit of 313.944 mm (12.360 in) on page 34.
Manual Section: Gathering Chain - TroubleshootingCorn kernels crushed at the base of the ear and shelling at stalk rolls p. 120
Measure the stalk roll end to front support gap on page 120. Set the clearance between 0.80 and 1.25 mm (0.03 and 0.05 in). Verify the stalk roll knives tip-to-tip diameter is 100 mm (3.94 in) +/- 0.5 mm (0.020 in) on page 118.
Manual Section: Shelling at stalk rollsFrequently Asked Questions
What are the replacement specifications for Knives (sickle bars)?
For stalk roll knives, set the tip to 100 mm (3.94 in) +/- 0.5 mm (0.020 in) diameter from tip to tip. All bolts on knives should be torqued to 80 - 90 Nm (59 - 66 lb ft).
What are the replacement specifications for Gathering chains?
Gathering chains should be replaced if the measured wear elongation exceeds approximately 3%. For example, if 12 pitches of a #80 chain measure 313.944 mm (12.360 in) or greater, it should be replaced. Refer to the "WEAR LIMITS ON ROLLER CHAIN" table on page 35 for specific new and replacement lengths based on chain number and pitch.
How do you fix case IH 3406 corn header pulls in too much trash and stalks break at deck plates?
Measure stalk roll center line spacing on page 119 and verify it is exactly 101.6 mm (4.0 in). Inspect the roller knife gap on page 121 and set clearance to 0.5 mm (0.02 in) to prevent stalk breakage.
How do you fix outside row unit stalk rollers and gathering chains completely stopped turning during field operation?
Drain the chain case and refill with 1.48 l (3.1 US pt) of oil as shown on page 128. Inspect the row unit gearbox on page 123 and verify the grease fill level is 25.4 mm (1.0 in) below the top of the gearbox.
How will I receive this Service Manual?
This is a 178-page searchable 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?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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