Description
The Chelsea 281GDFJP-B3RF or 281GDFJPB3RF is a 281 Series hydraulically shifted hot-shift Power Take-Off designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. It delivers 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 and reduces vibration effects. The clutch pack uses steel discs that are 80% thicker than those in the predecessor 280 Series, resisting premature tooth wear. A Wet Spline Lubrication option extends shaft life by 7 to 10 times. Rotatable cast-iron flanges improve pump clearance, and SmartStart reduces shock load at engagement for qualifying applications. Call us to confirm proper fit for your transmission and application.
Features
Hydraulic hot-shift (PowerShift) operation for engagement under load on automatic transmissions
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 280 Series for reduced tooth wear
Wet Spline Lubrication option extends shaft life 7 to 10 times over standard
Nine speed ratios including low and high speeds; SmartStart reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic (PowerShift / Hot Shift)
- Compatible Transmissions: Allison and Caterpillar automatic transmissions (10-bolt aperture)
- Continuous Operation: Yes
- Speed Ratios: Nine ratios, 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
- Output Types: 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, designed for demanding continuous-duty markets including fire and rescue, refuse, pumper cleaner, and truck crane applications. The Electronic Overspeed Control (EOC) option protects driven equipment from overspeed damage. A hose is included with this assembly. Rotatable cast-iron output flanges reduce interference concerns with pump mounting. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. Parker Chelsea 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.
