The Chelsea 281 Series Power Take-Off, part number 281GPFJP-B8RK or 281GPFJPB8RK, is a hydraulically shifted (PowerShift) hot-shift PTO built for automatic transmissions with a 10-bolt aperture, commonly found on Allison installations. 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% increase in clutch pack disc thickness to resist premature tooth wear. Nine speed ratios cover both low and high ranges. The rotatable cast-iron pump flanges reduce interference clearance issues, and the Wet Spline Lubrication option extends shaft life by 7 to 10 times. Call us to confirm proper fit for your application.
Reference documents for the Chelsea 281 Series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Common markets for this series include fire and rescue, truck cranes, pumper cleaner, and refuse applications.
Features
Ductile Iron Bearing Cap: 117% stronger than gray iron for greater durability under vibrational stress
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Enhanced Clutch Pack: steel discs are 80% thicker than the predecessor 280 Series to resist premature tooth wear
Nine speed ratios including low and high speeds
Rotatable cast-iron pump flanges reduce installation interference issues
Wet Spline Lubrication option extends shaft life 7 to 10 times; SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Compatible Transmission Manufacturer: Allison
- Continuous Operation: Yes
- Series Continuous Torque: 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 (28 kW at 500 RPM / 55 kW at 1000 RPM)
- Available Speed Ratios: Nine (including low and high)
- Lubricant Options: Pressure Lube (P) or Wet Spline (W)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- NMFC Code: 125820 - Hydraulic PTOs, Pumps, Motors, etc.
Additional Information
Reference documents for the Chelsea 281 Series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Common markets for this series include fire and rescue, truck cranes, pumper cleaner, and refuse applications.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
