The Chelsea 281 Series Power Take-Off, part number 281GSFJP-B8RS or 281GSFJPB8RS, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar platforms. It delivers a single, continuous duty torque rating up to 390 lb-ft (529 Nm) and nine speed ratios spanning low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, and an O-ring sealing configuration between the housing and bearing cap improves clamp load while reducing vibrational effects. The clutch pack features steel discs 80% thicker than the previous 280 Series, resisting premature tooth wear. Rotatable cast-iron flanges reduce pump clearance interference, and a positive stop for driveline outputs eliminates oil seal damage. Call us to confirm proper fit for your application.
The Chelsea 281 Series is an evolution of the top-selling 280 Series PTO, with targeted improvements for fire and rescue, truck cranes, pumper cleaner, and refuse market applications. The Wet Spline Lubrication option extends shaft service life by 7 to 10 times compared to standard configurations. The positive stop feature on driveline outputs prevents oil seal damage from coupling contact. SmartStart reduces shock loading at engagement for applicable configurations, and Electronic Overspeed Control (EOC) protects downstream driven equipment. Reference documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, available from Parker Chelsea.
Features
Hydraulic PowerShift (hot-shift) operation for automatic transmissions with 10-bolt aperture
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibration effects and improves clamp load
Enhanced clutch pack with steel discs 80% thicker than the 280 Series for reduced tooth wear
Nine speed ratios including low and high speeds; continuous torque rating up to 390 lb-ft (529 Nm)
Electronic Overspeed Control (EOC) and SmartStart option to reduce shock load at start-up
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Compatible Transmissions: Allison and Caterpillar automatic transmissions
- Continuous Torque Rating: 390 lb-ft (529 Nm)
- Speed Ratios: Nine ratios including low and high
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Wet Spline option provides 7 to 10 times greater shaft life
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for shock-load reduction at start-up
- Series: Chelsea 281 Series (evolution of the 280 Series)
Additional Information
The Chelsea 281 Series is an evolution of the top-selling 280 Series PTO, with targeted improvements for fire and rescue, truck cranes, pumper cleaner, and refuse market applications. The Wet Spline Lubrication option extends shaft service life by 7 to 10 times compared to standard configurations. The positive stop feature on driveline outputs prevents oil seal damage from coupling contact. SmartStart reduces shock loading at engagement for applicable configurations, and Electronic Overspeed Control (EOC) protects downstream driven equipment. Reference documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, available from Parker Chelsea.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
