The Chelsea 281 Series Power Take-Off, part number 281GBFJP-B5RY or 281GBFJPB5RY, is a hydraulically shifted hot-shift PTO built on a 10-bolt mounting pattern for automatic transmissions, including Allison applications. It carries a single, continuous-duty torque rating 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 from modern engine designs. Rotatable cast-iron flanges reduce interference issues around the pump, and a Positive Stop feature on driveline outputs protects the oil seal from coupling damage. Also referenced as SP281GBFJP-B5RY. Call us to confirm proper fit for your application.
The Chelsea 281 Series is an evolution of the 280 Series platform, serving Fire and Rescue, Truck Cranes, Pumper Cleaner, and Refuse markets. Relevant Parker documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Features
10-bolt mounting pattern, compatible with Allison automatic transmissions
Hydraulic PowerShift (hot-shift) operation for continuous-duty use
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibration
Nine speed ratios including both low and high speeds
Wet Spline Lubrication option extends shaft life 7 to 10 times over standard
SmartStart feature reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Compatible Transmission Manufacturer: Allison
- Continuous Operation: Yes
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application page
- Speed Ratios: Nine, including low and high speeds
- Lubricant Options: Pressure Lube (P) or Wet Spline (W)
- Cross Reference: SP281GBFJP-B5RY
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series platform, serving Fire and Rescue, Truck Cranes, Pumper Cleaner, and Refuse markets. Relevant Parker documents 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.
