The Chelsea 281 Series Power Take-Off, part number 281GDFJP-B8SD or 281GDFJPB8SD, is a hydraulically shifted (PowerShift) PTO built for automatic transmissions with a 10-bolt aperture, commonly used on Allison and Caterpillar transmissions. It carries a single, continuous duty torque rating, with nine speed ratios covering both low and high speeds. The ductile iron bearing cap is 117% stronger than gray iron, and the clutch pack features steel discs 80% thicker than the predecessor 280 Series design. An o-ring sealing configuration between the housing and bearing cap improves clamp load and resists vibrational effects. Rotatable cast-iron flanges reduce pump clearance interference, and the Wet Spline lubrication option extends shaft life by 7 to 10 times. SmartStart reduces shock load at start-up, and Electronic Overspeed Control (EOC) protects driven equipment. Call us to confirm proper fit for your transmission and application.
The 281 Series is Chelsea's evolution of the 280 Series PTO, with key structural and sealing upgrades designed to address vibrational effects from modern engine designs. Typical markets include fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. The hose is included with the unit. For application confirmation or transmission-specific fitment questions, contact Pro Gear and Transmission directly.
Features
10-Bolt mounting aperture, compatible with Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot shift) operation with nine speed ratios including low and high
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
Clutch pack steel discs are 80% thicker than 280 Series for reduced premature wear
Rotatable cast-iron flanges minimize pump clearance interference
Electronic Overspeed Control (EOC) and SmartStart for equipment protection and reduced start-up shock
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison, Caterpillar (automatic transmissions)
- Speed Ratios: Nine (includes low and high speeds)
- Continuous Operation: Yes
- Wet Spline Lubrication Option: Yes (7 to 10 times greater shaft life)
- SmartStart: Yes
- Electronic Overspeed Control (EOC): Yes
Additional Information
The 281 Series is Chelsea's evolution of the 280 Series PTO, with key structural and sealing upgrades designed to address vibrational effects from modern engine designs. Typical markets include fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. The hose is included with the unit. For application confirmation or transmission-specific fitment questions, contact Pro Gear and Transmission directly.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
