281GBFJP-B8RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off assembly, part number 281GBFJP-B8RK or 281GBFJPB8RK, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. It carries a single, continuous duty torque rating and offers nine speed ratios covering both low and high speeds. The 281 Series is an evolution of the Chelsea 280 Series, with a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between housing and bearing cap for improved clamp load, and an 80% increase in clutch pack steel disc thickness to resist premature tooth wear. Rotatable cast iron flanges reduce interference clearance issues, and an optional Wet Spline Lubrication configuration delivers 7 to 10 times greater shaft life. Electronic Overspeed Control (EOC) protects connected driven equipment. Also cross-referenced as 5P1491 and 5P1478. Call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmissions, commonly Allison
Ductile iron bearing cap rated 117% stronger than gray iron versus prior 280 Series design
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high speeds; single continuous duty torque rating
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart option reduces shock load at start-up
Wet Spline Lubrication option extends shaft life 7 to 10 times; Positive Stop for driveline outputs eliminates oil seal damage

Tech Specs

• Mounting Type: 10-Bolt aperture
• Shift Type: Hydraulic PowerShift (hot-shift)
• Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
• Continuous Operation: Yes
• Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
• Speed Ratios: Nine, including low and high speeds
• Lubrication Options: Pressure Lube (P) or Wet Spline (W)
• Cross-Reference: 5P1491, 5P1478

Additional Information

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