281GDFJP-B8AC Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off (part number 281GDFJP-B8AC or 281GDFJPB8AC) is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison transmissions. The 281 Series is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap, and an 80% increase in clutch pack steel disc thickness to resist premature tooth wear and manage the vibrational demands of modern engine designs. Nine speed ratios cover both low and high speed applications. Wet Spline Lubrication is available as an option, extending shaft life by 7 to 10 times compared to standard configurations. Electronic Overspeed Control (EOC) and the SmartStart feature are included to protect driven equipment and reduce shock load at engagement. Common applications include fire and rescue, truck cranes, refuse trucks, and pumper cleaner units. Call us to confirm proper fit for your transmission and application.

Features

Ductile iron bearing cap - 117% stronger than gray iron for increased durability
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
80% thicker steel discs in the clutch pack resist premature tooth wear
Nine speed ratios available including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment from overspeed damage
SmartStart reduces shock load at engagement for applicable configurations
Rotatable cast iron flanges reduce interference and improve pump clearance
Positive stop on driveline outputs eliminates oil seal damage from coupling
Hose included - no need to order separately

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic)
• Transmission Application: Allison automatic transmissions
• Continuous Operation: Yes
• Speed Ratios: Nine, including low and high speeds
• Lubrication Options: Pressure Lube (P) or Wet Spline (W)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Series: Chelsea 281 Series (evolution of 280 Series)

Additional Information

Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices