The Chelsea 3P837X is a pump shaft for the Chelsea 812 series power takeoff. Designed to work within the 812 PTO, this shaft is the driven interface between the power takeoff and the hydraulic pump. The Chelsea 812 series is a well-established PTO platform used across a range of medium- and heavy-duty truck applications. Pro Gear and Transmission carries genuine Chelsea PTO components including this shaft. If you need help confirming this is the correct shaft for your 812 series installation, give us a call.FeaturesGenuine Chelsea part number 3P837XDesigned for the Chelsea 812 series power takeoffFunctions as the drive interface between the PTO and hydraulic pumpDirect replacement for 812 series pump shaft applicationsSold by Pro Gear and Transmission