The Chelsea 272 Series Power Take-Off Assembly, part number 272RKKUP-B3XD or 272RKKUPB3XD, is a 6-bolt hot-shift PTO designed for medium-duty work across towing and recovery, aerial, construction, and water truck applications. It mounts via a 6-bolt pattern and delivers a 1-1/4" round output shaft with a 5/16" key. Shift actuation is pneumatic or PowerShift (pneumatic/hydraulic), with an integral air control valve included. The 272 Series carries a continuous torque rating up to 300 lb-ft (407 Nm) and intermittent torque in the 201-300 lb-ft (401-500 Nm) range. Output power reaches 56+ HP, with shaft power measured at 29 HP at 500 RPM and 57 HP at 1,000 RPM. Compatible transmission families include Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM. Call us to confirm proper fit for your application.
Features
6-bolt mounting pattern for broad transmission compatibility
1-1/4" round output shaft with 5/16" key
Pneumatic or PowerShift (pneumatic/hydraulic) actuation with integral air control valve
Continuous torque rating up to 300 lb-ft (407 Nm); intermittent torque 201-300 lb-ft (401-500 Nm)
Output power 56+ HP; shaft power 29 HP at 500 RPM, 57 HP at 1,000 RPM
Compatible with Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM transmissions
Tech Specs
- Intermittent Torque: 201-300 lb-ft (401-500 Nm)
- Continuous Torque: Up to 300 lb-ft (407 Nm) - Check Application Pages for Actual Torque Ratings
- Mounting Type: 6-Bolt
- Output Shaft Type: 1-1/4" Round with 5/16" Key
- Output Power: 56+ HP (41-50 kW)
- Shift Type: Pneumatic or PowerShift (Pneumatic/Hydraulic)
- Integral Air Control Valve: Included
- Shaft Power at 500 RPM: 29 HP (21 kW)
- Shaft Power at 1,000 RPM: 57 HP (43 kW)
- Compatible Transmission Manufacturers: Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, RAM, Other
Additional Information
The Chelsea 272 Series consolidates and replaces the earlier 230, 231, 236, 238, 270, and 271 Series medium-duty hot-shift PTOs into a single platform. The series offers nine speed ratios and eighteen shift options, making it adaptable across a wide range of truck and equipment configurations. Direct-mount outputs are available with optional Wet-Spline technology for extended PTO and pump shaft service life. Driveshaft output configurations include the Smart-Start option, engineered for high-torque start-up conditions where initial load demand is elevated. The rotatable flanges allow positioning flexibility during installation. Typical market applications include aerial equipment, towing and recovery, construction equipment, water trucks, material handling, and defense vehicles. Part number 272RKKUP-B3XD is also referenced as SP272RKKUP-B3XD in some catalog systems.Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
