The Chelsea 281 Series Power Take-Off, part number 281GDFJP-N5AC or 281GDFJPN5AC, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. It delivers a single continuous duty torque rating of 390 lb-ft (529 Nm) and offers nine speed ratios spanning low and high ranges. The 281 Series is an evolution of the 280 Series, with notable engineering upgrades: 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, an 80% thicker steel clutch pack to resist premature tooth wear, and rotatable cast-iron flanges that reduce pump clearance interference. Wet Spline Lubrication extends shaft life 7 to 10 times. Electronic Overspeed Control (EOC) protects driven equipment. Common markets include fire and rescue, refuse, truck cranes, and pumper cleaner applications. Call us to confirm proper fit for your specific transmission and application.
Features
Hydraulic PowerShift (hot-shift) operation for automatic transmissions with 10-bolt aperture
Ductile iron bearing cap, 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
80% thicker steel discs in clutch pack resist premature tooth wear
Nine speed ratios including low and high speeds; 390 lb-ft (529 Nm) continuous torque rating
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at start-up
Wet Spline Lubrication option extends shaft life 7 to 10 times; hose included
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Continuous Torque: 390 lb-ft (529 Nm)
- Continuous Operation: Yes
- Transmission Compatibility: Allison and Caterpillar automatic transmissions (10-bolt aperture)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine, including low and high
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM (28 kW / 55 kW)
- Lubrication: Pressure Lube or Wet Spline option
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for certain applications
- Markets: Fire and Rescue, Refuse, Truck Cranes, Pumper Cleaner
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
