The Chelsea 21P766 is a cap bearing designed specifically for the “XV” output configuration of Chelsea 870 Series and 877 Series power takeoffs. Listed in the illustrated parts manuals for both the PTO-870-Series and PTO-877-Series, this bearing is a dedicated fit for XV output units only, not a universal cap bearing shared across all output types. If you are working on an 870 or 877 Series PTO with an XV output shaft, this is the correct cap bearing position for that assembly. Call us to confirm the output type on your unit before ordering.FeaturesFits Chelsea 870 Series and 877 Series power takeoffsDesigned for “XV” output configurations onlyListed in the OEM illustrated parts manual for both PTO-870-Series and PTO-877-SeriesQty 1 per assembly positionGenuine Chelsea replacement partTech SpecsApplication: Chelsea PTO-870-Series and PTO-877-SeriesOutput Requirement: XV Output OnlyQty Per Assembly: 1Used in these Chelsea PTO models280 Series287 Series870 Series877 Series