The Chelsea 281 Series Power Take-Off, part number 281GTFJP-B5RB or 281GTFJPB5RB, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison transmissions. It mounts via a 10-bolt pattern and offers nine speed ratios covering both 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 that are 80% thicker than the predecessor 280 Series, resisting premature tooth wear. Rotatable cast-iron flanges reduce pump clearance interference. The series carries a continuous torque rating of 390 lb-ft and supports output power of 56 HP or more. A genuine Chelsea part available from Pro Gear and Transmission. Call us to confirm proper fit for your specific transmission and application.
The Chelsea 281 Series is suited for demanding markets including fire and rescue, truck cranes, pumper cleaner, and refuse vehicles. Hose is included with the assembly. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling. Electronic Overspeed Control (EOC) protects driven equipment from overspeed events. SmartStart reduces shock load at engagement for select applications. Parker documents covering this 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 for use with Allison 10-bolt automatic transmissions
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap reduces vibrational effects and improves clamp load
Clutch pack steel discs are 80% thicker than the Chelsea 280 Series for reduced tooth wear
Nine speed ratios available, including low and high-speed options
Wet Spline lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) and SmartStart option reduces shock load at start-up
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Continuous Torque Rating: 390 lb-ft (529 Nm)
- Output Power: 56+ HP (51+ kW)
- Speed Ratios: Nine (including low and high)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube or Wet Spline (application-dependent)
- Series: Chelsea 281 Series (evolution of the 280 Series)
Additional Information
The Chelsea 281 Series is suited for demanding markets including fire and rescue, truck cranes, pumper cleaner, and refuse vehicles. Hose is included with the assembly. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling. Electronic Overspeed Control (EOC) protects driven equipment from overspeed events. SmartStart reduces shock load at engagement for select applications. Parker documents covering this 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.
