The Chelsea 272 Series power take-off assembly, part number 272ACKUP-H5RK or 272ACKUPH5RK, is a 6-bolt hot shift PTO designed for medium-duty commercial truck applications. The 272 Series supports up to 300 lb-ft of intermittent torque and offers both pneumatic and hydraulic shift options with an integral air control valve. Output shaft choices include a 1-inch round shaft with 1/4-inch key and a 1-1/4-inch round shaft with 5/16-inch key. The series covers nine speed ratios across 18 shift configurations, with rotatable flanges for flexible mounting. Typical applications include aerial, towing and recovery, construction equipment, and water trucks. Call us to confirm proper fit for your application.
Features
6-bolt mounting for medium-duty hot shift applications
Intermittent torque rating up to 300 lb-ft (401-500 Nm)
Available with pneumatic or hydraulic shift; integral air control valve included
Rotatable flanges allow flexible installation orientation
Output shaft options: 1-inch round with 1/4-inch key or 1-1/4-inch round with 5/16-inch key
Smart-Start option supports high-torque start-up conditions
Tech Specs
- Mounting Type: 6-Bolt
- Shift Type: Pneumatic or Hydraulic
- Intermittent Torque: 201-300 lb-ft (401-500 Nm)
- Output Shaft Type: Round Shaft (1-inch with 1/4-inch key) or Round Shaft (1-1/4-inch with 5/16-inch key)
- Output Power: 56+ HP (41-50 kW)
- Speed Ratios: 9 available
- Shift Configurations: 18 options
- Lubricant Options: X = No Pressure Lube, P = Pressure Lube, W = Wet Spline
Additional Information
The Chelsea 272 Series consolidates the earlier 230, 231, 236, 238, 270, and 271 Series into a single platform. The Wet-Spline option extends PTO and pump shaft service life. Driveshaft output versions are available with Smart-Start technology for demanding high-torque engagement conditions. Common markets include aerial, towing and recovery, construction equipment, water trucks, defense, material handling, and water drilling applications.Parts Manual: Chelsea 272 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
