199497C1 Driven Sprocket for Case-IH Corn Head — 10-Tooth Replacement

199497C1 / 176278C2 Driven Sprocket — Corn Head Gathering Chain Replacement for Case-IH 800–1000 Series

This aftermarket driven sprocket (OEM reference 199497C1 / 176278C2) is engineered as a direct replacement for the front gathering chain sprocket on Case-IH and International corn heads in the 800, 900, and 1000 series. With a 10-tooth profile, 1.0-inch keyway bore, and heat-treated steel construction, it restores gathering chain tension and timing so your row units keep pulling stalks cleanly into the snapping rolls — harvest after harvest. Each kit ships with the sprocket, nut, and washer, giving you everything needed to complete the swap at the row unit.

What a Driven Sprocket Does in a Corn Head Row Unit

In a corn head row unit, the gathering chain system consists of two sprockets working as a pair: the drive sprocket at the rear (powered by the row unit gearbox) and the driven sprocket at the front (the idler end that maintains chain tension and guides the chain as it returns). The driven sprocket sits at the leading tip of the row unit — the first mechanical component to contact incoming stalks. Its position directly controls how aggressively the gathering chain paddles engage the crop.

When the teeth on this sprocket wear down or the bore becomes loose on the shaft, the gathering chain loses consistent tension. A slack chain skips teeth, allows stalks to escape sideways, and causes uneven wear on paddles and chain links — all of which add up to crop loss and higher per-acre repair costs. Replacing a worn driven sprocket restores the precise chain path that channels stalks reliably into the deck plates and snapping rolls.

Positioned forward of the deck plates, this sprocket also acts as the first point of contact for downed or lodged corn. A correctly fitted, dimensionally accurate replacement sprocket improves your header's ability to lift and guide those fallen stalks rather than pushing over them — reducing field losses on difficult harvest days.

Product Specifications

Important: The nut included in this kit is sized for aftermarket shafts (e.g., A&I manufactured shafts). It will not thread onto the original OEM shaft. If you are retaining the factory shaft, source a compatible nut separately before installation.

Technical Specifications and Compatibility

This replacement sprocket for Case IH is verified to fit the following corn head models. Always cross-reference your OEM part number (199497C1 or 176278C2) before ordering to confirm fitment.

Series coverage: 800 series, 900 series, 1000 series corn heads. If your model number is not listed above but your current sprocket carries OEM reference 199497C1 or 176278C2, this part will be dimensionally interchangeable.

Why Choose Our Heavy-Duty Gathering Chain Sprockets?

OEM sprockets carry a price premium that is hard to justify on a part that wears on every acre. Our aftermarket gathering chain driven sprockets close that gap without cutting corners on the dimensions or material that matter.

• Exact OEM geometry. Tooth count (10T), pitch, and keyway dimensions are machined to match the OEM 199497C1 specification, so the replacement sprocket fits the shaft and meshes with the existing gathering chain without adjustment.
• Heat-treated tooth surface. Through heat treatment raises surface hardness beyond what mild steel offers, extending tooth life in the abrasive conditions common at the leading edge of a row unit — sand, grit, stalk fiber, and intermittent impact loads.
• Complete kit in one order. Sprocket, nut, and washer are packaged together. You do not need to source hardware separately, which cuts prep time when you are working against harvest weather.
• Broad cross-reference. A single part number covers over 25 Case-IH and International header models across three decades of production. Fewer SKUs to manage in your parts inventory.
• Ready stock for fast dispatch. Harvest breakdowns do not follow a schedule. In-stock availability means the part ships the same day rather than waiting on an OEM dealer back-order.

Installation and Maintenance Guide for Drive Sprockets

Replacing the front gathering chain sprocket is a straightforward row unit task. The steps below cover a standard 900/1000 series row unit. Always consult the Case-IH operator manual for your specific header before beginning.

1. Disengage the header drive and shut down the combine. Engage the header safety latch and allow all rotating components to stop completely before working near the row unit.
2. Relieve gathering chain tension. Loosen the tensioner or slide the front sprocket shaft to its inner position, giving enough slack to remove the chain from the sprocket teeth.
3. Remove the retaining nut and washer. The front shaft is typically secured with a single nut. Note thread direction — some shafts use left-hand threads. Remove the worn sprocket from the shaft.
4. Inspect the shaft and keyway. Look for corrosion, wear grooves, or damage to the keyway slot. A damaged shaft will cause the new sprocket to run off-center and wear prematurely.
5. Install the new sprocket. Align the keyway in the sprocket bore with the key on the shaft. Seat the sprocket fully, then torque the nut to the Case-IH specification for your row unit model.
6. Re-engage the chain and set tension. Reconnect the gathering chain to the sprocket and adjust tension so there is approximately 1/2 inch of slack at the mid-span of the lower run. Excess tension accelerates both chain and sprocket wear.
7. Check alignment. The chain should track centrally on the sprocket teeth with no side loading. Misalignment indicates a bent shaft or incorrect sprocket seating.

Maintenance interval: Inspect the front driven sprocket and gathering chain at the start of every season and again at the 200-hour service mark. Tooth flank wear exceeding 25% of original width is the standard replacement threshold. Replacing the sprocket and chain together restores the matched wear profile and extends the life of both components.

Keep a spare driven sprocket and a length of gathering chain in your harvest supply kit. A row unit that goes down mid-field due to a broken sprocket costs far more in lost time than the part itself.

Key Features of the 199497C1 Sprocket

A heavy-duty aftermarket driven sprocket for Case IH must meet the same functional requirements as the original component — tooth engagement geometry, bore concentricity, and surface durability. Here is what this part delivers on each of those counts.

• 10-tooth profile matched to standard gathering chain pitch. The 10-tooth count is not arbitrary — it sets the chain speed ratio relative to the drive sprocket, governing paddle timing through the row unit. A deviation in tooth count changes that timing and disrupts stalk flow.
• 1.0-inch finished keyway bore. The bore is machined to a 1.0-inch diameter with a broached keyway slot. This matches the front shaft diameter used across the 800–1000 series row units, providing a positive, keyed connection that resists rotational slip under load.
• Heat-treated carbon steel construction. The sprocket body is manufactured from carbon steel and subjected to heat treatment to increase surface hardness. Harder tooth flanks resist the peening and rounding that occur as chain rollers pass over them under tension thousands of times per hour during harvest.
• Wide cross-model compatibility. A single replacement sprocket for Case IH covers the 1043, 1044, 1054, 1063, 1064, 1083, 1084 corn heads plus over 18 International header models, reducing the number of unique part numbers needed across a mixed-fleet operation.
• Upper drive chain gathering sprocket design. The geometry follows the OEM upper drive chain gathering sprocket specification (176278C1 / 199497C1), meaning tooth form, hub diameter, and overall width are identical to the original — no shimming, machining, or modification required during installation.
• Kit-packaged for field readiness. Bundling the sprocket with its nut and washer ensures the installer has every fastener needed at the row unit, eliminating the common problem of sourcing hardware mid-repair in a field setting.

Frequently Asked Questions

Frequently Ordered Together

The driven sprocket is one component in a drive system. These parts are typically replaced in the same service interval to maintain matched wear across the row unit.