Overview
This aftermarket clutch drum and sprocket kit serves as a direct replacement for the factory unit on your chainsaw. The clutch drum and sprocket kit houses the sprocket that drives the chain and absorbs engagement forces from the clutch, so when the sprocket teeth wear down and the drum bore enlarges from heat and friction, cutting performance and safety both suffer. Swapping in a fresh replacement restores reliable chain drive and helps protect the rest of the drivetrain.
Key specifications
- Pitch: 3/8”
- Teeth: 6T
- Quantity: 4 pieces
- Material: hardened steel
- Type: aftermarket replacement
Compatibility
Built to fit Stihl 019T and other models sharing the same drivetrain layout. Always confirm your specific model and year against the compatibility list, because sprocket dimensions can differ even between closely related saws.
Installation notes
Take off the bar, chain, and clutch cover. Immobilize the crankshaft with a piston stop and remove the clutch. Replace the entire drum and sprocket assembly along with the needle bearing. Reinstall the clutch, torque it to spec, then mount the bar and chain. Break in the new sprocket gently for the first few cuts.
Common questions
Q: Will this 1123 640 2003 3/8” 6-tooth clutch drum sprocket washer and E-clip kit fit my Stihl 019T with an 8-inch bar?
Yes, this kit is listed for the Stihl 019T and matches the 3/8” pitch setup commonly used on that saw with an 8-inch bar. The main thing to confirm is that your chain is also 3/8” pitch, since the drum sprocket must match the chain pitch for proper operation.
Q: Does this kit include everything I need to replace the clutch drum hardware on my 019T, or do I need to reuse parts from the old assembly?
This kit includes the clutch drum sprocket along with the washer and E-clip, which are the common wear and retention parts replaced during a drum service. You should still inspect the needle bearing before reassembly, since that part is often reused unless it shows scoring, heat damage, or excessive play.
Q: When installing this 3/8” 6T clutch drum on a Stihl 019T, is there anything I should do to prevent premature wear?
Clean the crankshaft stub and check that the needle bearing is lightly greased before sliding the new drum into place. It also helps to inspect the rim area, chain alignment, and bar groove wear, because a worn bar or dry bearing can make a new 6-tooth drum wear out much faster.
