Part of the Case IH Repair Manuals.
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 Hydraulic Cylinder - Disassembly | - | Rod Seal and Wiper Seal, Piston and Rod Assembly, Cylinder Head Nut Torque, Cylinder Head Retaining Nut, Cylinder Head Snap Ring, Piston Rod Assembly Removal |
| Deck Plate Hydraulic Cylinder - Install & Inspect | - | Cylinder Barrel Positioning, Rod End to Adjusting Bar Connection, Hydraulic Hose Reconnection, Point and Divider Assembly, O-Ring and Seal Inspection, Piston and Rod Thread Inspection, Component Repair or Replace |
| Deck Plate Indicator - Cable Service | - | New Cable Routing, Lower Cable End Attachment, Upper Cable End Attachment, Cable End Adjustment, Feeder Safety Lock, Yoke Cotter Pin and Clevis Pin, Cable Removal From Indicator Bracket, Cable Removal From Header Frame |
| Feeding Row Unit - Pinching Rolls | - | Front Roll Supports, Stripper Plate Lever, Bearing and Seal Press-In, Stalk Roll Knives, Row Unit Gearbox Mounting, Drive Chain and Shaft Shields, Tensioner Bolt and Spring Assembly, Chain Guide Plate, Tension Sprocket, Divider and Point Assembly |
| Gathering Chain | - | Chain Guide Bolt, Gathering Chain Installation, Tensioner Bolt Adjustment, Chain Guide Wear Strip, Front Hood Support Brace Bolt, Loss of Ear Corn in Field, Pulling Up Corn Stalks |
| Row Unit Gearbox - Assemble & Disassemble | - | - |
| Row Unit Gearbox - Exploded Views & Special Tools | - | Stalk Roll Drive Shaft, Shim Set, Tapered Roller Bearing, Cover Assembly, External Retaining Ring, Oil Seal, Idler Gear Stub Shaft Puller, Shaft Bearing Support Tool, M10 Hex Head Bolt, Bar Stock and Tube Stock |
| Slip Clutch - Assemble, Torque Check & Disassemble | - | Flange and Hub Assembly, Lube Fittings, Inner and Outer Springs, Cam Pins, Slip Clutch Torque Check, Hub Pockets, Internal Housing Walls, Urethane Dirt Excluder Seal Ring, Internal Retaining Ring, Thrust Ring, Clutch Housing |
| Slip Clutch - Exploded View, Install & Remove | - | Flange and Clamp Housing, Lube Fitting and Seal, Internal Retaining Ring, Grade 8 Bolts and Lock Nuts, Bearing Assembly, Drive Chain and Idler Sprocket, Internal Grease Seal |
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
Gathering chain jumps teeth on the sprocket or sags excessively during heavy corn intake
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 - Troubleshooting p. 146Corn kernels crushed at the base of the ear and shelling at stalk rolls
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 rolls p. 120Frequently 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). p. 118
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. p. 34
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. p. 119
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. p. 128
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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