281GDFJP-K5SD Chelsea PTO Assembly

The Chelsea 281GDFJP-K5SD or 281GDFJPK5SD is a 281 Series hydraulically shifted hot-shift power take-off built for automatic transmissions with a 10-bolt aperture, including Allison applications. It shifts under load without interrupting transmission operation. The ductile iron bearing cap is 117% stronger than the gray iron cap used in the predecessor 280 Series, and the clutch pack features steel discs that are 80% thicker to resist premature tooth wear. An O-ring sealing configuration between the housing and bearing cap reduces vibration effects and improves clamp load. The 281 Series offers nine speed ratios covering both low and high ranges, with the wet spline lubrication option extending shaft life by 7 to 10 times. Electronic Overspeed Control (EOC) protects driven equipment, and SmartStart reduces shock load at engagement for select applications. Call us to confirm proper fit for your transmission and application.

Features

Hydraulic hot-shift (PowerShift) design for 10-bolt aperture automatic transmissions including Allison
Ductile iron bearing cap rated 117% stronger than the gray iron cap in the predecessor 280 Series
Enhanced clutch pack with steel discs 80% thicker than the 280 Series to resist premature tooth wear
O-ring sealing between housing and bearing cap improves clamp load and resists vibration
Nine speed ratios available, spanning low and high speed ranges
Wet spline lubrication option provides 7 to 10 times greater shaft life
SmartStart output reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast-iron flanges reduce interference clearance issues; positive stop for driveline outputs eliminates oil seal damage

Tech Specs

• Mounting Type: 10-bolt aperture
• Shift Type: Hydraulic hot-shift (PowerShift)
• Compatible Transmissions: Allison automatic transmissions (10-bolt aperture)
• Speed Ratios: Nine ratios including low and high speeds
• Continuous Operation: Yes
• Bearing Cap Material: Ductile iron (117% stronger than gray iron)
• Lubrication Option: Wet spline lubrication (7 to 10 times greater shaft life)
• Output Options: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
• Electronic Overspeed Control (EOC): Included
• SmartStart: Available for select applications
• Series: Chelsea 281 Series (evolution of the 280 Series)

Additional Information

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