Compatible with Stihl Chainsaws MS290, MS310, MS390, 029, 039 Farm Boss models. Replaces ST OEM part numbers 1127 640 3201 (oil pump) and 1127 640 7101 (worm gear) for smooth, consistent oil delivery. Includes high-quality oil pump + worm gear for full lubrication system repair or upgrade. Ensures proper chain lubrication, reducing friction, overheating, and premature chain wear during cutting. Restore full oiling function to your S tihl chainsaw with this aftermarket oil pump and worm gear set, compatible with popular S tihl models including MS290, MS310, MS390, MS029, and MS039. This combo kit replaces OEM parts 1127 640 3201 (oiler assembly) and 1127 640 7101 (plastic worm gear). The oil pump is precision-engineered for optimal fit, and the included worm gear is made from impact-resistant nylon to handle high RPM and heavy-duty use. This is a cost-effective alternative to OEM parts with no compromise in quality or performance.