The Chelsea 281 Series Power Take-Off, part number 281GSFJP-B5XD or 281GSFJPB5XD, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. The 281 Series carries a continuous torque rating of 390 lb-ft and offers nine speed ratios covering both low and high ranges. Its ductile iron bearing cap is 117% stronger than gray iron, and the clutch pack uses steel discs that are 80% thicker than the previous 280 Series design to resist premature wear. An o-ring sealing configuration between the housing and bearing cap improves clamp load and reduces the effects of engine vibration. Rotatable cast-iron flanges ease pump clearance during installation. Cross-references include 280GSFJP-B5XD and 280GSFJPB5XD. Call us to confirm proper fit for your transmission and application.
The 281 Series is the evolution of the Chelsea 280 Series PTO, engineered specifically to handle the increased vibration demands of modern engine designs. Common markets for this series include fire and rescue, truck cranes, pumper-cleaner trucks, and refuse vehicles. The Positive Stop feature on driveline outputs eliminates oil seal damage caused by improper coupling engagement. Parker Chelsea documents for this series 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 on 10-bolt automatic transmission aperture
Ductile iron bearing cap rated 117% stronger than gray iron
Enhanced clutch pack with steel discs 80% thicker than the predecessor 280 Series
O-ring sealing between housing and bearing cap reduces vibration effects and improves clamp load
Nine speed ratios available, including low and high-speed options
SmartStart feature reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Wet Spline Lubrication option extends shaft life by 7 to 10 times compared to standard lubrication
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Compatible Transmission: Allison automatic transmissions
- Continuous Torque Rating: 390 lb-ft (529 Nm)
- Speed Ratios: Nine ratios including low and high speeds
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1,000 RPM
- Lubrication: Pressure Lube or Wet Spline option
- Cross-References: 280GSFJP-B5XD, 280GSFJPB5XD, CHE-280GSFJP-B5XD, 3252POE633SE
Additional Information
The 281 Series is the evolution of the Chelsea 280 Series PTO, engineered specifically to handle the increased vibration demands of modern engine designs. Common markets for this series include fire and rescue, truck cranes, pumper-cleaner trucks, and refuse vehicles. The Positive Stop feature on driveline outputs eliminates oil seal damage caused by improper coupling engagement. Parker Chelsea documents for this series 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.
