281GMFJW-B8RF Chelsea PTO Assembly

The Chelsea 281GMFJW-B8RF or 281GMFJWB8RF is a 281 Series hydraulically shifted hot-shift power take-off designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. This series features 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 enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear. Nine speed ratios cover both low and high speed demands. The wet spline lubrication design delivers 7 to 10 times greater shaft life compared to dry-spline configurations. Rotatable cast-iron flanges reduce interference clearance issues, and the SmartStart feature reduces shock load at engagement. Electronic Overspeed Control (EOC) protects downstream driven equipment. Cross-reference: replaces 280GMFJW-B8RF or 280GMFJWB8RF. Call us to confirm fit for your specific transmission and application.

Features

Hydraulic hot-shift (PowerShift) operation for Allison 10-bolt automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron, for increased durability
O-ring seal between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios including low and high speeds
Wet spline lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment
SmartStart reduces shock load at engagement for compatible applications
Rotatable cast-iron flanges reduce pump clearance interference
Positive stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic Hot-Shift (PowerShift)
• Compatible Transmissions: Allison and Caterpillar automatic transmissions (10-bolt aperture)
• Continuous Torque (Series): 390 lb-ft (529 Nm) - verify actual rating on application page
• Speed Ratios: Nine, including low and high
• Lubrication: Wet Spline option available
• Cross Reference: 280GMFJW-B8RF or 280GMFJWB8RF

Additional Information

Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.