281GBFJP-B5RF Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GBFJP-B5RF or 281GBFJPB5RF, is a hydraulically shifted (PowerShift) hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly used on Allison transmissions. It mounts via a 10-bolt pattern and offers nine speed ratios covering both low and high ranges. The 281 Series is an evolution of the 280 Series, carrying a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between housing and bearing cap to resist vibration, and an 80% thicker clutch pack steel disc design. Electronic Overspeed Control (EOC) protects driven equipment, and the SmartStart feature reduces shock load at engagement. Call us to confirm proper fit for your application.

Features

10-bolt mounting aperture for Allison automatic transmissions
Hydraulic PowerShift (hot shift) for engagement under load
Ductile iron bearing cap, 117% stronger than gray iron
O-ring seal between housing and bearing cap reduces vibration and improves clamp load
Clutch pack steel discs increased 80% in thickness to resist premature tooth wear
Nine speed ratios including low and high speeds
Wet Spline Lubrication option for 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment
SmartStart reduces shock load at start-up
Positive Stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting: 10-Bolt
• Shift Type: Hydraulic PowerShift (hot shift)
• Compatible Transmissions: Allison automatic transmissions
• Continuous Torque (series rating): 390 lb-ft (529 Nm)
• Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
• Speed Ratios: Nine, including low and high
• Lubrication: Pressure lube or wet spline option
• Continuous Operation: Yes

Additional Information

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