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Compatibility
This part will fit the following 643 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
MTDMTD 12886-8 - MTD Walk-Behind Mower (1988)21"
MTDMTD 12886-7 - MTD Walk-Behind Mower (1987)21"
MTDMTD 12886R-9 - MTD Walk-Behind Mower (1989)21"
MTDMTD 12871-7 - MTD Walk-Behind Mower (1987)21"
MTDMTD 120-898E - MTD Walk-Behind Mower (1990)21"
Description
The purpose of the Oil Seal is to protect shaft and bearings from intake of dirt and debris, and prevent oil or grease from leaking out. Replacing a damaged oil seal can prevent the more consequential damage to the crankshaft and other parts of the engine. Improper assembly, excessive wear, poor lubrication, and contamination from debris can all damage the oil seal and require replacement. Be sure to adjust the oil seal tightness when installing to prevent leaks of rotating shafts.