Products Description
MS260 Worm Gear – Oil Pump Drive for STIHL 024/026/MS240/MS260
Precision Drive Component for Automatic Chain Lubrication
This worm gear is the central drive element of the automatic chain lubrication system on STIHL 024, 026, MS240, and MS260 chainsaws. Mounted on the crankshaft, it engages with the oil pump turbine to drive the pump piston, delivering a continuous supply of bar and chain oil during operation. Replaces OEM part numbers 1121 640 7111 (superseding 1121 640 7110) and is often sold as a complete assembly with the carrier, which replaces 1121 647 3100.
Technical Profiles & Materials
Oil Pump Drive Function – The worm gear transmits rotational force from the crankshaft to the oil pump turbine, driving the pump piston to deliver oil to the guide bar and chain during operation.
OEM-Spec Replacement – Replaces STIHL part numbers 1121 640 7111 (which replaced 1121 640 7110) and 1121 640 7110. Available as an aftermarket component matching OEM specifications.
Complete Assembly Options – Some listings include the worm gear with the carrier (replaces 1121 647 3100) as a complete assembly. Comprehensive clutch drum kits also include the worm gear alongside the drum, sprocket, and bearings.
Durable Construction – Manufactured from wear-resistant materials (aluminum and iron) to withstand the demands of continuous operation.
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Part No. | 1121 640 7111 (supersedes 1121 640 7110) |
| 2 | Carrier Part No. | 1121 647 3100 (included in some assemblies) |
| 3 | Conversion Kit OEM | 1121 007 1043 (adjustable oil pump kit) |
| 4 | Compatible Models | STIHL 024, 024S, 026, 026 PRO, MS240, MS260 |
| 5 | Also Fits | 024AV, 026AV, 026 C, MS260 C-B, MS260 C-B W, MS260 C-B Z, MS260-D, MS260-W, MS260-Z, MS260 Arctic variants |
| 6 | Fitment Note | Works with arm-driven worm gear systems requiring the slot/notch on the clutch drum edge |
| 7 | Material | Aluminum / Iron alloy |
| 8 | Installation | Direct replacement; sold with carrier in many assemblies |
Products Application
Oil Pump Drive Restoration
When the chain fails to receive adequate lubrication, the worm gear or oil pump may be worn or damaged. This replacement component restores the drive connection between the crankshaft and oil pump, ensuring consistent oil delivery to the guide bar and chain.
Clutch Drum Assembly Replacement
The worm gear is often replaced as part of a complete clutch drum assembly, which includes the drum, sprocket, bearing, and worm gear in one kit. This comprehensive approach ensures all drive components are renewed simultaneously.
Preventative Maintenance
During engine service or top-end rebuilds, replacing the worm gear is recommended to prevent failure from wear or gear breakage. A worn worm gear can cause insufficient lubrication, leading to increased friction and damage to the bar and chain from dry running.
Quality and Craftsmanship Details
Products Package
About Us
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FAQ
Q: How do I confirm this worm gear fits my chainsaw?
A:Check your chainsaw model number. This worm gear fits STIHL 024, 026, MS240, and MS260 models. It replaces OEM part numbers 1121 640 7111 (superseding 1121 640 7110) and is often sold with the carrier (1121 647 3100).
Q: What is the difference between 1121 640 7111 and 1121 640 7110?
A: 1121 640 7111 is the updated OEM number that superseded 1121 640 7110. Both serve the same function; use the newer 7111 part number for current compatibility.
Q: What is the MOQ and lead time?
A: MOQ: 100 PCS. Delivery: 7-14 days. Neutral export carton packaging.
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