871 Series

The Chelsea 871 Series Power Take-Off (PTO) is a 10-bolt, high-capacity design engineered for demanding continuous-duty applications. Built with advanced gear geometry and heavy-duty bearings, it delivers torque ratings of up to 670 lb-ft without requiring de-rating for continuous operation. The 871 Series replaces the previous 870 Series and introduces a range of durability and performance upgrades. Key improvements include a ductile iron bearing cap that is 117% stronger than the previous gray iron design, along with an enhanced O-ring sealing system between the housing and bearing cap. These upgrades increase clamp load and help reduce vibration-related wear caused by modern engine operating characteristics. Designed for flexibility and performance, the 871 Series offers multiple gear ratios to support a wide range of speed requirements and applications. It is also the only Chelsea PTO that can be configured with all three of Chelsea’s advanced performance technologies: Wet Spline, SmartStart, and QuietGear™ options. The PTO provides a compact housing design to help reduce clearance issues while maintaining high torque output of up to 670 lb-ft (908 N·m). Additional features include nine speed ratios, thirteen output options, and a variety of configuration choices to meet different installation requirements. Safety and performance enhancements such as Electronic Overspeed Control (EOC) help protect driven equipment, while optional Wet Spline technology extends PTO and pump shaft life. SmartStart reduces shock loads at engagement, and QuietGear technology helps minimize operational noise in sensitive applications. The Chelsea 871 Series PTO is commonly used in fire and rescue vehicles, truck cranes, refuse trucks, and pumper cleaner applications where reliability, torque, and long service life are critical.