The Chelsea 281 Series Power Take-Off, part number 281GKFJW-B5RK or 281GKFJWB5RK, is a hydraulically shifted (PowerShift) hot-shift PTO built for automatic transmissions with a 10-bolt aperture, commonly used on Allison transmissions. The 281 Series is an evolution of the 280 Series, carrying a 390 lb-ft continuous torque rating and nine available speed ratios spanning low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, and the clutch pack uses steel discs that are 80% thicker than the prior generation to resist premature tooth wear. An O-ring sealing configuration between the housing and bearing cap reduces vibrational effects and improves clamp load. Rotatable cast-iron flanges reduce interference clearance issues, and a wet spline lubrication option extends shaft life 7 to 10 times compared to dry configurations. SmartStart reduces shock load at engagement, and Electronic Overspeed Control (EOC) protects driven equipment. Call us to confirm proper fit for your transmission and application.
Features
Hydraulic PowerShift (hot-shift) operation for automatic transmissions with 10-bolt aperture
Ductile iron bearing cap rated 117% stronger than gray iron
Clutch pack steel discs are 80% thicker than the previous 280 Series generation
O-ring seal between housing and bearing cap reduces vibration effects and improves clamp load
Nine speed ratios available, including low and high speeds
Wet spline lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison automatic transmissions
- Continuous Torque Rating: 390 lb-ft (529 Nm)
- Output Types Available: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Speed Ratios: Nine ratios including low and high
- Continuous Operation: Yes
- Lubricant Options: Pressure lube (P) or wet spline (W)
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
