281GSFJP-B5RF Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GSFJP-B5RF or 281GSFJPB5RF, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. This series is an evolution of the 280 Series, with 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. Rotatable cast-iron flanges reduce interference issues with pump mounting. Nine speed ratios cover both low and high speed applications. Cross-references include 280GSFJP-B5RF and 280GSFJPB5RF. Call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot-shift) operation for use with 10-bolt automatic transmission apertures, commonly Allison
Ductile iron bearing cap is 117% stronger than gray iron for greater durability under vibration
Enhanced clutch pack with steel discs 80% thicker than previous 280 Series design
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios available, including low and high speeds
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart option reduces shock load at engagement
Wet spline lubrication option provides 7 to 10 times greater output shaft service life; positive stop on driveline outputs eliminates oil seal damage

Tech Specs

• Mounting Type: 10-Bolt aperture
• Shift Type: Hydraulic PowerShift (hot-shift)
• Compatible Transmissions: Allison automatic transmissions
• Continuous Operation: Yes
• Speed Ratios: Nine, including low and high speeds
• Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
• Lubrication: Pressure lube or wet spline options
• Cross-Reference: 280GSFJP-B5RF or 280GSFJPB5RF

Additional Information

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