The Chelsea 272XMAJX-A3XD or 272XMAJXA3XD is a 272 Series hot-shift power take-off assembly built on a 6-bolt mount. It features a 1-1/4" round output shaft with a 5/16" key and supports both pneumatic and PowerShift (pneumatic/hydraulic) shift options. Continuous torque capacity reaches 300 lb-ft (407 Nm); intermittent torque falls in the 201-300 lb-ft (401-500 Nm) range. The 272 Series consolidates several earlier Chelsea medium-duty PTO lines and covers a wide range of transmission manufacturers including Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM. Typical applications include aerial, construction equipment, towing and recovery, and water trucks. Call us to confirm proper fit for your specific transmission and application.
Features
6-bolt mounting configuration for broad transmission compatibility
1-1/4" round output shaft with 5/16" key
Pneumatic and PowerShift (pneumatic/hydraulic) shift options
Continuous torque capacity up to 300 lb-ft (407 Nm); intermittent rating 201-300 lb-ft (401-500 Nm)
Output power 56+ HP (41-50 kW); shaft power 57 HP 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
- 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 Transmission Manufacturers: Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, RAM, Other
- Dimensions (H x W x L): 15.75" x 12.5" x 14"
Additional Information
The Chelsea 272 Series consolidates several earlier Parker Chelsea medium-duty hot-shift PTO lines - including the 230, 231, 236, 238, 270, and 271 Series - into a single versatile platform. The series includes an integral air control valve and offers rotatable flanges for installation flexibility. An optional Wet-Spline design is available within the series for extended PTO and pump shaft service life. The Smart-Start option addresses high-torque start-up conditions common in demanding applications such as towing and recovery and aerial work. The 272 Series offers nine speed ratios and eighteen shift options across the product family, making it adaptable to a wide range of medium-duty vocational truck builds.Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
