Chelsea 281 Series Power Take-Off Assembly, part number 281GSFJP-B5RY or 281GSFJPB5RY, 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 280 Series, adding 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 an 80% thicker clutch pack steel disc set to resist premature tooth wear. Nine speed ratios cover both low- and high-speed applications. Series continuous torque is rated at 390 lb-ft (529 Nm). A genuine Chelsea part, sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
The 281 Series is built for demanding vocational applications including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Parker Chelsea publishes supporting documentation for this series: 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, both available through Parker Chelsea. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling over-travel. SmartStart reduces shock load at engagement for compatible applications, and Electronic Overspeed Control (EOC) safeguards driven equipment during operation.
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 vibrational 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
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at start-up
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Transmission Fitment: Allison and Caterpillar automatic transmissions
- Continuous Torque: 390 lb-ft (529 Nm)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine (includes low and high speeds)
- Lubrication: Pressure Lube or Wet Spline options
- Continuous Operation: Yes
Additional Information
The 281 Series is built for demanding vocational applications including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Parker Chelsea publishes supporting documentation for this series: 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, both available through Parker Chelsea. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling over-travel. SmartStart reduces shock load at engagement for compatible applications, and Electronic Overspeed Control (EOC) safeguards driven equipment during operation.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
