The Chelsea 272ACKUP-B5RB or 272ACKUPB5RB is a 6-bolt hot-shift power take-off assembly from Chelsea's 272 Series, designed for medium-duty applications in towing and recovery, aerial, construction, and water truck service. It features a 1-1/4" round output shaft with a 5/16" key and supports both pneumatic and hydraulic (PowerShift) engagement. Continuous torque capacity reaches 300 lb-ft (407 Nm), with intermittent ratings up to 300 lb-ft (401-500 Nm). At 1,000 RPM, shaft power output reaches 57 HP (43 kW). The 272 Series is compatible with transmissions from Allison, Eaton/Fuller, Volvo/Mack, Ford, Aisin, and RAM platforms. 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 and hydraulic (PowerShift) shift options with integral air control valve
Continuous torque rating: 300 lb-ft (407 Nm); intermittent: up to 300 lb-ft (401-500 Nm)
Shaft power: 57 HP (43 kW) at 1,000 RPM
Compatible with Allison, Eaton/Fuller, Volvo/Mack, Ford, Aisin, 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 torque ratings
- Mounting Type: 6-bolt
- Output Shaft Type: 1-1/4" round with 5/16" key
- Shift Type: Pneumatic or PowerShift (pneumatic/hydraulic)
- Output Power: 56+ HP (41-50 kW)
- Shaft Power at 500 RPM: 29 HP (21 kW); at 1,000 RPM: 57 HP (43 kW)
- Transmission Compatibility: Allison, Eaton/Fuller, Volvo/Mack, Ford, Aisin, RAM, and other manufacturers
Additional Information
Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
