The Chelsea 281 Series Power Take-Off Assembly, part number 281GDFJW-B8RZ or 281GDFJWB8RZ, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison transmissions. It delivers nine speed ratios covering low and high speeds, with a single continuous duty torque rating across the range. The series features 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 enhanced clutch pack with steel discs 80% thicker than the previous generation. Rotatable cast-iron flanges reduce pump interference, and a positive stop on driveline outputs eliminates oil seal damage from coupling contact. The wet spline lubrication option extends shaft life 7 to 10 times compared to standard configurations. SmartStart reduces shock load at startup, and Electronic Overspeed Control (EOC) protects connected driven equipment. A genuine Chelsea part sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Hydraulic PowerShift (hot-shift) operation for use with 10-bolt automatic transmission apertures, including Allison
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap reduces vibrational effects and improves clamp load
Clutch pack steel discs are 80% thicker than previous-generation 280 Series design
Nine speed ratios available, including low and high speeds
Wet spline lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces startup shock load; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Continuous Operation: Yes
- Speed Ratios: Nine (includes low and high speeds)
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Lubricant Options: Pressure lube (P) or wet spline (W)
- Series: Chelsea 281 (evolution of 280 Series)
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
