The Chelsea 272MAAJP-5KRK or 272MAAJP5KRK is a 272 Series hot-shift power take-off assembly built on a 6-bolt mounting pattern. Output is through a 1-1/4" round shaft with a 5/16" key. Shift is pneumatic or pneumatic/hydraulic PowerShift, and the unit includes an integral air control valve. The 272 Series supports continuous torque up to 300 lb-ft (407 Nm) and intermittent torque in the 201-300 lb-ft (401-500 Nm) range; check application pages for actual de-rated torque ratings. Output power reaches 56+ HP (41-50 kW), with shaft power measuring 29 HP (21 kW) at 500 RPM and 57 HP (43 kW) at 1,000 RPM. Compatible transmission manufacturers include Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM. Call us to confirm proper fit for your specific transmission and application.
Features
6-bolt mounting pattern for broad transmission compatibility
1-1/4" round output shaft with 5/16" key
Pneumatic and pneumatic/hydraulic PowerShift options with integral air control valve
Continuous torque rating up to 300 lb-ft (407 Nm); intermittent torque 201-300 lb-ft (401-500 Nm)
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: 300 lb-ft, 407 Nm (check application pages for actual de-rated torque ratings)
- Mounting Type: 6-Bolt
- Output Shaft Type: 1-1/4" round shaft with 5/16" key
- Output Power: 56+ HP, 41-50 kW
- Shaft Power: 29 HP (21 kW) at 500 RPM; 57 HP (43 kW) at 1,000 RPM
- Shift Type: Pneumatic; PowerShift (Pneumatic/Hydraulic)
- Compatible Transmissions: Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, RAM
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, updated platform. The series offers nine speed ratios and eighteen shift options. Wet-Spline technology is available on direct-mount configurations to extend PTO and pump shaft service life. The Smart Start option is designed for high-torque start-up conditions and is available on driveshaft output configurations. Rotatable flanges add installation flexibility. Typical applications include towing and recovery, aerial, construction equipment, and water trucks.Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
