The Chelsea 281 Series Power Take-Off, part number 281GDFJP-B5AB or 281GDFJPB5AB, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. The 281 Series advances on the proven 280 Series design with a ductile iron bearing cap rated 117% stronger than gray iron and an 80% thicker clutch pack disc to resist premature tooth wear. A continuous torque rating of 390 lb-ft and nine available speed ratios covering both low and high ranges make this PTO well-suited for fire and rescue, refuse, pumper cleaner, and truck crane applications. Rotatable cast iron flanges improve pump clearance, and the Wet Spline Lubrication option is engineered for 7 to 10 times greater shaft life. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Hydraulic hot-shift (PowerShift) design for on-the-go engagement on Allison automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
80% thicker steel discs in the clutch pack to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high speeds; 390 lb-ft continuous torque rating
Electronic Overspeed Control (EOC) and SmartStart option reduces shock load at engagement; Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Intermittent Torque: 301 to 400 lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM
- Speed Ratios: Nine, including low and high
- Transmission Application: Allison automatic transmissions (10-bolt aperture)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubricant Options: Pressure Lube, Wet Spline
- Markets: Fire and Rescue, Refuse, Pumper Cleaner, Truck Cranes
Additional Information
Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices
