281GKFJP-B5RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GKFJP-B5RK or 281GKFJPB5RK, is a hydraulically shifted, hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. The 281 Series is an evolution of the 280 Series, carrying cross-references 280GKFJP-B5RK and 280GKFJPB5RK among others. Key structural upgrades include 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 applications. Rotatable cast-iron flanges reduce interference fit concerns, and the Wet Spline Lubrication option extends shaft life by 7 to 10 times. A genuine Chelsea part, available from Pro Gear and Transmission. Call us to confirm proper fit for your application.

Features

10-bolt aperture mount, designed for Allison and Caterpillar automatic transmissions
Hydraulic (PowerShift) hot-shift operation for continuous-duty use
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Nine speed ratios including low and high speeds; Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic (PowerShift) Hot-Shift
• Transmission Compatibility: Allison and Caterpillar automatic transmissions
• Continuous Operation: Yes
• Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
• Output Power (series): 56+ HP (51+ kW)
• Speed Ratios: Nine, including low and high speeds
• Lubrication Options: Pressure Lube (P), Wet Spline (W)
• Positive Stop: Yes, for driveline outputs
• SmartStart: Yes, available for applicable configurations
• Electronic Overspeed Control (EOC): Yes
• Cross References: 280GKFJP-B5RK, 280GKFJPB5RK, CHE-280GKFJP-B5RK, CHE280GKFJPB5RK, CHL 280GKFJP B5RK, CHL280GKFJPB5RK, 1450-280GKFJPB5RK, 1450280GKFJPB5RK

Additional Information

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