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CHELSEA part description

Representative Image - The product image above applies to all Chelsea Series 280 PTOs and is not part specific. Please verify the product using the part number.

Chelsea 280 Series is a hydraulically shifted hot shift PTO designed for automatic transmissions with a 10-Bolt aperture, commonly found on Allison and Caterpiller transmissions. The 280 Series replaces the 277/278 Series.

Chelsea's 280 Series is a new PTO that delivers high continuous-duty torque in a range of speeds where power and durability are required. It is capable of up to 390 ft-lbs in continuous duty applications. With nine ratios, rotatable output flanges, remote hydraulic valve options, wet-spline technology, and Chelsea Smart Start options, it is perfect for Vacuum, Refuse, and Fire and Rescue applications in the Mobile market.


  • Aerial
  • Oil and Gas
  • Defense
  • On-Highway

Products Features:

  • Rotatable Flanges to improve clearance
  • Continuous-Duty Torque Rating up to 390 ft-lbs
  • Wet-Spline Option to extend PTO/Pump shaft life
  • Smart Start Option for High-Torque Start-up
  • Two Year Warranty


  • Fire and Rescue Trucks
  • Pumper Cleaner
  • Truck Cranes
  • Refuse Trucks

Performance Characteristics:

Mounting Style: 10-Bolt
Shift Type: Powershift Hydraulic
Standard Output Shaft Size: 1-1/4" Round w/key
Continuous Torque Rating (Lbs-ft): 390
Continuous Torque Rating (Nm): 529
Hosepower Rating for Continuous Service:  
At 500 R.P.M. of Output Shaft (HP): 37
At 500 R.P.M. of Output Shaft (Kw): 28
At 1000 R.P.M. of Output Shaft (HP): 74
At 1000 R.P.M. of Output Shaft (Kw): 56
Approximate Weight: 49 lbs. [22 kg]
* Check Application Pages for Actual Torque Ratings
Mounting Type: Standard Mount 10-Bolt with Metric Studs
Gear Ratio: 31/41
Input Type: Allison (Automatically Pressured Lube)
Lube Type: Pressure Lube
Shift Type: 12V Electric / Hydraulic
Assembly Arrangement: Left Side: Bulge Down, Right Side: Bulge Up
Output Type: Round Standard Shaft (1.25"-5/16" Key)

Chelsea®, a division of Parker, manufactures and supplies a comprehensive selection of Power Take-Off (PTO) products for the mobile vocational and truck markets. Over the years, this company has grown exponentially, thanks to its global network of distribution centers in North America, Europe, Asia, and Australia. It also attributes its continued success to the individual employee's full commitment to providing only the highest quality products to its customers worldwide. More people choose this brand because its board range of products is offered with varying torque capacities, internal speeds, and output options. So whatever your driven equipment requirement is, Parker Chelsea has got you covered.


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