The Chelsea 281 Series Power Take-Off, part number 281GKFJW-N5RK or 281GKFJWN5RK, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, commonly used on Allison transmissions. It carries a single, continuous duty torque rating and offers nine speed ratios covering both low and high speeds. The ductile iron bearing cap is 117% stronger than gray iron, and the clutch pack uses steel discs that are 80% thicker than the previous-generation design to resist premature tooth wear. Rotatable cast-iron flanges reduce interference fitment issues, and the wet spline lubrication option extends shaft life by 7 to 10 times compared to standard configurations. Electronic Overspeed Control (EOC) protects downstream driven equipment, and the SmartStart feature reduces shock load at engagement. A genuine Chelsea part, sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 281 Series is an evolution of the 280 Series PTO, engineered to address vibrational effects from modern engine designs. The o-ring sealing configuration between the housing and bearing cap improves clamp load and reduces vibrational damage. A Positive Stop on driveline outputs eliminates oil seal damage from coupling. Markets served by the 281 Series include fire and rescue, truck cranes, pumper-cleaner vehicles, and refuse trucks. Hose is included with this assembly. Relevant Parker Chelsea documents for the 281 Series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Features
Hydraulic PowerShift (hot-shift) operation on 10-bolt aperture automatic transmissions, including Allison
Ductile iron bearing cap rated 117% stronger than gray iron
Enhanced clutch pack with steel discs 80% thicker than the predecessor 280 Series design
Nine speed ratios available, including both low and high speeds
Wet spline lubrication option extends shaft life 7 to 10 times over standard
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces engagement shock load
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Compatible Transmission Manufacturer: Allison
- Continuous Operation: Yes
- Speed Ratios: Nine (including low and high speeds)
- Lubrication: Wet Spline option available
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Series Output Power: 56+ HP (51+ kW)
- Series Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Output Types Available in Series: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series PTO, engineered to address vibrational effects from modern engine designs. The o-ring sealing configuration between the housing and bearing cap improves clamp load and reduces vibrational damage. A Positive Stop on driveline outputs eliminates oil seal damage from coupling. Markets served by the 281 Series include fire and rescue, truck cranes, pumper-cleaner vehicles, and refuse trucks. Hose is included with this assembly. Relevant Parker Chelsea documents for the 281 Series include 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.
