The Chelsea 281GCFJW-B3RK is a 281 Series Power Take-Off unit designed for automatic transmissions with a 10-bolt aperture, including Allison applications. It uses hydraulic PowerShift (hot shift) engagement, allowing PTO engagement without stopping the vehicle. The 281 Series carries a continuous torque rating of 390 lb-ft and supports continuous operation duty cycles. This series evolved from the Chelsea 280 Series with a ductile iron bearing cap rated 117% stronger than the gray iron predecessor, an o-ring sealing configuration between the housing and bearing cap, and clutch pack steel discs increased 80% in thickness. Output options across the 281 Series include SAE B and SAE C pump flanges, ISO 7652, and driveline outputs. Common markets include fire and rescue, refuse, truck cranes, and pumper cleaner applications.
Features
281 Series Chelsea PTO, part number 281GCFJW-B3RK
Hydraulic PowerShift (hot shift) engagement for 10-bolt automatic transmissions including Allison
Continuous torque rating: 390 lb-ft (529 Nm)
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Clutch pack steel discs increased 80% in thickness for reduced premature wear
O-ring sealing between housing and bearing cap for improved clamp load
Wet spline lubrication option available within the 281 Series for extended shaft life
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic), hot shift
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Output Options (281 Series): SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options (281 Series): 3/4" - 11T Pump Spline, SAE B 7/8" - 13T Pump Spline, SAE C 1-1/4" - 14T Pump Spline, 1-1/4" Round Shaft with 5/16" Key, 1410 Companion Flange
- Shaft Power (281 Series): 37 HP at 500 RPM, 74 HP at 1000 RPM
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO, engineered to handle vibrational demands from modern engine designs. Key improvements include a ductile iron bearing cap, an o-ring sealing interface between housing and bearing cap, and an 80% thicker clutch pack disc. The series supports Electronic Overspeed Control (EOC) and SmartStart to reduce shock loads at engagement. Nine speed ratios are available across the series, including low- and high-speed options. Common market applications include fire and rescue, refuse collection, truck cranes, and pumper cleaner trucks. Relevant Parker Chelsea documentation includes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
