The Chelsea 272ACKUP-G5RB or 272ACKUPG5RB is a 272 Series hot-shift power take-off built on a 6-bolt mount. It delivers a 1-1/4" round output shaft with a 5/16" key and supports pneumatic or PowerShift (pneumatic/hydraulic) engagement. Continuous torque capability reaches 300 lb-ft (407 Nm), with intermittent ratings of 201-300 lb-ft (401-500 Nm). At 1,000 RPM, shaft power reaches 57 HP (43 kW). The 272 Series is compatible with transmissions from Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM, making it a practical fit across aerial, construction, towing and recovery, and water truck applications. Call us to confirm proper fit for your specific transmission.
Features
6-bolt mounting configuration
Pneumatic and PowerShift (pneumatic/hydraulic) shift options with integral air control valve
1-1/4" round output shaft with 5/16" key
Continuous torque rating up to 300 lb-ft (407 Nm); intermittent rating 201-300 lb-ft (401-500 Nm)
Shaft power: 29 HP (21 kW) at 500 RPM; 57 HP (43 kW) at 1,000 RPM
Compatible transmissions include Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM
Tech Specs
- Intermittent Torque: 201-300 lb-ft (401-500 Nm)
- Continuous Torque: 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
- Shift Type: Pneumatic; PowerShift (Pneumatic/Hydraulic)
- Output Power: 56+ HP (41-50 kW)
- 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 several earlier medium-duty hot-shift PTO series - including the 230, 231, 236, 238, 270, and 271 - into a single, more versatile platform. The series offers nine speed ratios, eighteen shift options, and a selection of direct-mount and driveshaft output configurations. Direct-mount variants are available with optional Wet-Spline technology for extended PTO and pump shaft life. Driveshaft output models may include Smart-Start for high-torque start-up conditions. Rotatable flanges allow flexible installation orientation. Typical market applications include aerial equipment, construction machinery, towing and recovery, and water trucks.Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
