The Chelsea 272GMAJX-P3RK or 272GMAJXP3RK is a 272 Series hot shift power take-off assembly built on a 6-bolt mounting pattern. It uses a 1-1/4" round output shaft with a 5/16" key and supports pneumatic or PowerShift (pneumatic/hydraulic) engagement. The 272 Series consolidates several earlier Chelsea medium-duty PTO lines into a single platform with continuous torque capacity up to 300 lb-ft (407 Nm) and intermittent torque in the 201-300 lb-ft range. Output power reaches 56+ HP, with shaft power measured at 57 HP at 1,000 RPM. Compatible transmissions include Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, and RAM applications. Call us to confirm proper fit for your specific transmission.
Features
6-bolt mounting pattern for direct transmission installation
1-1/4" round output shaft with 5/16" key
Pneumatic or PowerShift (pneumatic/hydraulic) shift engagement
Continuous torque up to 300 lb-ft (407 Nm); intermittent torque 201-300 lb-ft (401-500 Nm)
Output power 56+ HP (41-50 kW); 57 HP at 1,000 RPM shaft power
Broad transmission compatibility: Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, RAM
Tech Specs
- Intermittent Torque: 201-300 lb-ft (401-500 Nm)
- Continuous Torque: Up to 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)
- Shift Type: Pneumatic or PowerShift (Pneumatic/Hydraulic)
- Shaft Power: 29 HP (21 kW) at 500 RPM; 57 HP (43 kW) at 1,000 RPM
- Compatible Transmissions: Allison, Eaton/Fuller, Ford, Aisin, Volvo/Mack, RAM, and others
- Lubricant Code (P): Pressure Lube
Additional Information
The Chelsea 272 Series consolidates the earlier 230, 231, 236, 238, 270, and 271 PTO series into a single medium-duty hot shift platform. The series offers nine speed ratios and 18 shift options. Pressure lube designation (P in part number suffix) indicates this unit is equipped for pressure lubrication. The 272 Series is engineered for Aerial, Construction Equipment, Towing and Recovery, and Water Truck applications. An integral air control valve is included. Rotatable flanges allow flexible installation orientation. The Smart Start option supports high-torque start-up conditions where applicable. Part number also referenced as 272GMAJXP3RK (no hyphens).Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
