STIHL Driver - 4140 190 2010

Engineered to restore factory alignment between the drive sprocket and guide bar carrier, the STIHL 4140 190 2010 drivereliminates chain lateral drift and returns optimal torque transfer to heavy-duty cutting operations.

Key Features

• Precision-ground shaft and head profile engineered for direct fit into STIHL bar carrier and sprocket housings
• Case-hardened construction resists galling and fatigue during sustained high-RPM operation
• Consistent dimensional tolerances maintain proper chain tension tracking and reduce guide bar vibration
• Factory-specified heat treatment ensures reliable load distribution across the drive sprocket interface

Product Details

The STIHL 4140 190 2010 driver functions as a critical alignment pin between the drive sprocket assembly and the guide bar mounting platform. Manufactured to original engineering specifications, this component transfers cutting torque while maintaining coaxial rotation of the chain loop. Wear on this part typically manifests as uneven chain travel, increased lubrication waste, or audible sprocket noise. Replacement requires removal of the clutch drum and bar clamp hardware, followed by straight-pull installation into the existing carrier bore. No machining or bedding steps are necessary for machines retaining undamaged drive cavities.

• Material specification: medium-carbon alloy steel, through-hardened
• Surface finish: clean mill tolerance to prevent interference during reassembly
• Servicing interval: inspect during every fourth major tune-up or when bar drag exceeds normal parameters
• Packaging: individual protective wrap prevents corrosion storage and transit damage

Compatibility

• MS 261 C-M, MS 271 C-M, MS 361, MS 461 professional chainsaws
• FS 360, KS 360, KM 360 powered cutting platforms with standard sprocket nose carriers
• KM 56 R, KMA 56 R, KS 56 R multi-tool adapters sharing identical drive architecture
• Compatible aftermarket guide bars manufactured to STIHL MS-series pitch and gauge standards