1317192C1 Sprocket — 9-Tooth Replacement for Case-IH Combine Grain Auger Drive

Hardened Tooth Profile

Teeth are heat-treated after hobbing, producing a hard wear surface over a tough core. This resists the cyclic impact loads typical of grain elevator duty, where chain tension spikes each time a loaded flight engages the conveyor sprocket.

Precision Key-Slot Machining

The 4 × 8 × 57 mm keyway is broached to tolerance after bore machining, keeping the sprocket concentric on the 1-1/4″ shaft. Shaft runout caused by a sloppy keyway fit is a common source of premature chain wear that this process eliminates.

41.4 mm Pitch Accuracy

Pitch is held within tight CNC hobbing tolerances across all 9 teeth. Mismatched pitch between a replacement sprocket and a used chain is the fastest route to accelerated wear — a dimension-verified part prevents this.

Corrosion-Resistant Outer Coating

The outer surface carries a protective coating that resists oxidation during off-season storage. Grain dust mixed with moisture is highly corrosive to bare steel — the coating keeps surface pitting from spreading to functional tooth faces.

OEM Quality Sprocket for Case-IH Aftermarket Parts

Every unit is dimensionally verified against the 1317192C1 drawing before dispatch. Bore, pitch, outer diameter, and key-slot dimensions are checked as a set — not sampled — ensuring no out-of-tolerance parts reach the field.

Dual-Position Fitment

One part number covers both upper and lower auger positions on most listed models, simplifying procurement. Stocking a single SKU reduces parts-room complexity for dealers and fleet operators servicing mixed Case-IH fleets.

Q1: Does this sprocket fit both the upper and lower clean grain auger on all listed models?

Not on every model. It fits both positions on the 1640–2366 series, lower only on the 1682, and upper only on the 2188 and 2388. Check the compatibility table above for your specific model before ordering.

Q2: Is this an OEM quality sprocket for Case-IH aftermarket use?

Yes. The part matches the 1317192C1 drawing on all key dimensions — 9 teeth, 41.4 mm pitch, 35 mm bore, 4×8×57 mm keyway — and receives the same hardening process as the original.

Q3: Should I replace the elevator chain at the same time?

Strongly recommended. Installing a new sprocket on a worn chain causes accelerated re-wear on the new part. We supply matching elevator chains — contact us with your chain pitch and strand count for a paired quote.

Q4: What cross-reference numbers does this part cover?

This unit replaces OEM numbers 1317192C1, A-1317192C1, SP122, and SP122H. If your parts catalogue lists any of these, this is the correct replacement.

Q5: How do I know when the conveyor sprocket needs replacing?

Inspect tooth tips for a hooked or sharpened profile, check for visible wear grooves on flanks, and listen for chain skip under load. Any one of these signs indicates the sprocket should be replaced at the next scheduled maintenance window.

Clean Grain Elevator Chain

41.4 mm pitch roller chain for Case-IH elevator assemblies. Replace chain and sprocket together to avoid uneven contact wear.

PTO Drive Shaft

Telescoping PTO shafts with overrun clutch protection for combine and header power take-off connections.

Idler Sprockets

Matching idler sprockets for the same elevator chain loop, available in the same material and coating specifications.