The Chelsea 281 Series Power Take-Off, part number 281GGFJP-B8RF or 281GGFJPB8RF, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. The 281 Series is an evolution of the Chelsea 280 Series, with a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap to improve clamp load, and 80% thicker steel discs in the clutch pack to resist premature tooth wear. The series supports nine speed ratios covering low and high speeds, and includes a wet spline lubrication option providing 7 to 10 times greater shaft life. Common markets include fire and rescue, refuse, truck cranes, and pumper cleaner applications. Call us to confirm proper fit for your transmission and application.
The Chelsea 281 Series is suited for demanding continuous-duty applications in fire and rescue, refuse, truck crane, and pumper cleaner equipment. Rotatable cast-iron flanges reduce interference issues and improve pump clearance. The positive stop feature for driveline outputs eliminates oil seal damage from coupling. A hydraulic hose is included with this assembly. Applicable Parker Chelsea reference documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Features
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibration effects
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios including low and high speeds
Wet spline lubrication option provides 7 to 10 times greater shaft life
SmartStart feature reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Continuous Torque (Series): 390 lb-ft (529 Nm) - verify actual rating on application page
- Output Power (Series): 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1,000 RPM
- Speed Ratios: Nine, including low and high
- Continuous Operation: Yes
- Lubrication: Pressure lube or wet spline option
- Output Types Available: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
Additional Information
The Chelsea 281 Series is suited for demanding continuous-duty applications in fire and rescue, refuse, truck crane, and pumper cleaner equipment. Rotatable cast-iron flanges reduce interference issues and improve pump clearance. The positive stop feature for driveline outputs eliminates oil seal damage from coupling. A hydraulic hose is included with this assembly. Applicable Parker Chelsea reference documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
