Description
The Chelsea 281GSFJP-D8RK or 281GSFJPD8RK is a 281 Series Power Take-Off assembly designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. As a hydraulically shifted PowerShift PTO, it is built for continuous-duty operation. The 281 Series features a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap for improved clamp load, and steel clutch discs that are 80% thicker than those in the predecessor 280 Series. Nine speed ratios cover both low- and high-speed requirements. Common markets include fire and rescue, refuse, truck cranes, and pumper-cleaner trucks. Call us to confirm proper fit for your transmission and application.
Features
Chelsea 281 Series PowerShift (hydraulic) hot-shift PTO assembly
10-bolt mounting for Allison and Caterpillar automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap for improved clamp load
80% thicker steel clutch disc pack versus the 280 Series predecessor
Nine available speed ratios including both low- and high-speed options
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Continuous Operation: Yes
- Transmission Compatibility: Allison and Caterpillar automatic transmissions
- Continuous Torque Rating: 390 lb-ft (529 Nm) – verify actual rating on application pages
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubricant Options: Pressure Lube, Wet Spline
- Speed Ratios: Nine, including low- and high-speed
Additional Information
The 281 Series is an evolution of Chelsea’s top-selling 280 Series PTO. Key engineering upgrades include the ductile iron bearing cap, the improved o-ring housing seal, and the reinforced clutch pack. Available features for certain configurations include SmartStart, which reduces shock load at start-up, and Electronic Overspeed Control (EOC) to protect driven equipment. Rotatable cast iron flanges allow improved pump clearance. Wet spline lubrication, where applicable, provides 7 to 10 times greater shaft life compared to standard lubrication. Reference documents: 281/288 Series Parts List HY25-2281-M1/US and the 267/281/288/871/878 Series Owner’s Manual.
