281GKFJP-B3RB Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GKFJP-B3RB or 281GKFJPB3RB, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. The 281 Series is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap to reduce vibrational effects and improve 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 applications. Rotatable cast-iron flanges reduce interference clearance issues, and the Wet Spline lubrication option extends shaft life 7 to 10 times. Common markets include fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Call us to confirm proper fit for your specific transmission and application.

Features

Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel discs resists premature tooth wear
Nine speed ratios including low and high speeds
Rotatable cast-iron flanges reduce pump clearance interference
Wet Spline lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up for select applications
Electronic Overspeed Control (EOC) protects driven equipment
Positive stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic)
• Transmission Compatibility: Allison automatic transmissions
• Continuous Operation: Yes
• Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Speed Ratios: Nine, including low and high speeds
• Lubrication: Pressure Lube or Wet Spline options
• Series: Chelsea 281

Additional Information

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