The Chelsea 272ACKUP-B5RE or 272ACKUPB5RE is a 272 Series hot-shift power take-off assembly featuring a 6-bolt mounting configuration and a 1-1/4" round output shaft with a 5/16" key. The 272 Series consolidates multiple prior Chelsea medium-duty PTO lines into a single platform, offering continuous torque capability up to 300 lb-ft (407 Nm) and intermittent torque in the 201-300 lb-ft range. Shift is pneumatic or PowerShift (pneumatic/hydraulic), with an integral air control valve included. Compatible transmission families include Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, RAM, and others. Output power reaches 56+ HP, with shaft power ratings of 29 HP at 500 RPM and 57 HP at 1,000 RPM. Call us to confirm proper fit for your application.
Features
6-bolt mounting configuration for broad transmission compatibility
1-1/4" round output shaft with 5/16" key
Pneumatic or PowerShift (pneumatic/hydraulic) shift 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 (41-50 kW); shaft power 29 HP at 500 RPM, 57 HP at 1,000 RPM
Compatible with Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM transmission families
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)
- Shaft Power: 29 HP (21 kW) at 500 RPM; 57 HP (43 kW) at 1,000 RPM
- Compatible Transmissions: Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, RAM, and others
Additional Information
The Chelsea 272 Series consolidates the earlier 230, 231, 236, 238, 270, and 271 Series medium-duty hot-shift PTOs into a single updated platform. The series offers nine speed ratios and eighteen shift options. 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, designed for high-torque start-up conditions. Rotatable flanges allow flexible installation orientation. Typical application markets include towing and recovery, aerial work, construction equipment, and water trucks.Parts manual and diagrams: Chelsea 272 Series PTO parts list with prices
