The Chelsea 281 Series Power Take-Off Assembly, part number 281GDFJP-G8RY or 281GDFJPG8RY, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. As an evolution of the 280 Series, the 281 introduces 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 increased 80% in thickness to resist premature tooth wear. Nine speed ratios cover both low and high ranges. Rotatable cast-iron flanges reduce interference fit issues, and the wet spline lubrication option extends shaft life 7 to 10 times over standard configurations. Cross-references the prior 280 Series part 280GDFJP-G8RY or 280GDFJPG8RY. Call us to confirm proper fit for your application.
The 281 Series is suited for fire and rescue, truck cranes, pumper cleaner, and refuse applications. SmartStart reduces shock load at start-up for applicable configurations. The positive stop feature for driveline outputs eliminates oil seal damage from coupling. Hose is included with the 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
Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmissions including Allison
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibration effects and improves clamp load
Enhanced clutch pack with steel discs 80% thicker to resist premature tooth wear
Nine speed ratios available, including low and high-speed options
Wet spline lubrication option provides 7 to 10 times greater shaft life; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic (PowerShift / Hot-Shift)
- Compatible Transmissions: Allison automatic (10-bolt aperture)
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on Chelsea application pages
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine ratios including low and high speeds
- Lubrication: Pressure Lube or Wet Spline options
- Cross-Reference: 280GDFJP-G8RY or 280GDFJPG8RY
Additional Information
The 281 Series is suited for fire and rescue, truck cranes, pumper cleaner, and refuse applications. SmartStart reduces shock load at start-up for applicable configurations. The positive stop feature for driveline outputs eliminates oil seal damage from coupling. Hose is included with the 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.
