The Chelsea 272 Series power take-off assembly, part number 272MKAJX-B3BD or 272MKAJXB3BD, is a 6-bolt hot shift PTO built for medium-duty commercial truck applications. The 272 Series supports up to 300 lb-ft of intermittent torque and carries a continuous-duty torque rating (de-rated 30% from intermittent per Chelsea application guidelines). This unit shifts via pneumatic or hydraulic actuation and comes with an integral air control valve. The 272 Series consolidates several earlier Chelsea PTO lines into one platform, offering nine speed ratios and eighteen shift options. Common applications include aerial equipment, towing and recovery, water trucks, and construction equipment. A genuine Chelsea part, sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
6-bolt mounting configuration for medium-duty hot shift applications
Supports up to 300 lb-ft intermittent torque (continuous rating is de-rated 30%)
Available with pneumatic or hydraulic shift actuation
Includes integral air control valve
Nine speed ratios and eighteen shift configurations available within the 272 Series
Smart-Start option supported for high-torque start-up conditions
Tech Specs
- Mounting Type: 6-Bolt
- Shift Type: Pneumatic or Hydraulic
- Intermittent Torque: 300 lb-ft (201-300 lb-ft range)
- Continuous Torque: De-rated 30% from intermittent rating (see Chelsea application guidelines)
- Output Power: 56+ HP
- Output Shaft Options: Round shaft with 1 in. - 1/4 in. key, or round shaft with 1-1/4 in. - 5/16 in. key
- Lubricant Codes: X = No Pressure Lube, P = Pressure Lube, W = Wet Spline
- Part Number: 272MKAJX-B3BD or 272MKAJXB3BD
Additional Information
The Chelsea 272 Series consolidates the earlier 230, 231, 236, 238, 270, and 271 Series PTOs into a single updated platform. Moving parts are upgraded to handle 300 lb-ft intermittently or continuously (continuous use requires de-rating per Chelsea application data). The 272 Series is used across aerial, construction equipment, water truck, and towing and recovery markets. Optional Wet-Spline technology extends PTO and pump shaft service life on direct-mount configurations. Smart-Start capability is available for driveshaft output configurations where high-torque engagement is a concern. Rotatable flanges allow flexible installation orientation.Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
