The Chelsea 272 Series Power Take-Off Assembly, part number 272MKAJX-B3RK or 272MKAJXB3RK, is a 6-bolt hot-shift PTO designed for medium-duty applications across towing and recovery, aerial, construction equipment, and water truck service. It mounts with a 6-bolt pattern and delivers a 1-1/4" round output shaft with a 5/16" key. Shift is pneumatic or PowerShift (pneumatic/hydraulic), and the unit includes an integral air control valve. The 272 Series supports up to 300 lb-ft continuous torque and 201-300 lb-ft intermittent torque, with output power rated at 56+ HP. The series offers rotatable flanges and a Smart-Start option for high-torque start-up conditions. Call us to confirm proper fit for your transmission and application.
Features
6-bolt mounting pattern for broad transmission compatibility including Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM
1-1/4" round output shaft with 5/16" key
Pneumatic and PowerShift (pneumatic/hydraulic) shift options
Integral air control valve included
Continuous torque rating up to 300 lb-ft (407 Nm); intermittent torque 201-300 lb-ft (401-500 Nm)
Rotatable flanges and Smart-Start option available for high-torque start-up conditions
Tech Specs
- Mounting Type: 6-Bolt
- Output Shaft Type: 1-1/4" Round with 5/16" Key
- Shift Type: Pneumatic, PowerShift (Pneumatic/Hydraulic)
- Intermittent Torque: 201-300 lb-ft (401-500 Nm)
- Continuous Torque: 300 lb-ft (407 Nm) - check application pages for actual torque ratings
- Output Power: 56+ HP (41-50 kW)
- Shaft Power at 500 RPM: 29 HP (21 kW); at 1000 RPM: 57 HP (43 kW)
- Compatible Transmissions: Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, RAM, and other applications
Additional Information
Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
