The Chelsea 281 Series Power Take-Off Assembly, part number 281GBFJP-B3BD or 281GBFJPB3BD, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. The 281 Series is an evolution of the proven 280 Series, introducing a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap for improved clamp load, and an 80% increase in clutch pack steel disc thickness to resist premature tooth wear. Nine speed ratios cover both low and high-speed output needs, while the Electronic Overspeed Control (EOC) safeguards driven equipment. The wet spline lubrication option extends shaft life by 7 to 10 times. Cross-reference: 280GBFJP-B3BD or 280GBFJPB3BD. Call us to confirm proper fit for your application.
The Chelsea 281 Series is designed for demanding markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Rotatable cast iron flanges reduce pump clearance interference issues, and the positive stop for driveline outputs eliminates oil seal damage from coupling. The series ships with the hose included. Applicable Parker Chelsea service documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Features
Ductile iron bearing cap, 117% stronger than gray iron for improved durability
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Clutch pack steel discs increased 80% in thickness to resist premature tooth wear
Nine speed ratios available, including low and high-speed outputs
Wet spline lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at start-up
Tech Specs
- Mounting: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Compatible Transmissions: Allison (and Caterpillar) automatic transmissions with 10-bolt aperture
- Continuous Torque (Series Rating): 390 lb-ft (529 Nm)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine ratios, including low and high speeds
- Lubrication: Pressure lube (P) or wet spline (W) option
- Continuous Operation: Yes
- Cross-Reference Part Number: 280GBFJP-B3BD or 280GBFJPB3BD
Additional Information
The Chelsea 281 Series is designed for demanding markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Rotatable cast iron flanges reduce pump clearance interference issues, and the positive stop for driveline outputs eliminates oil seal damage from coupling. The series ships with the hose included. Applicable Parker Chelsea service 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.
