The Chelsea 281 Series Power Take-Off, part number 281GDFJS-D5AC or 281GDFJSD5AC, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison transmissions. It carries a single, continuous duty torque rating and offers nine speed ratios covering both low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, and an O-ring sealing configuration between the housing and bearing cap reduces vibrational effects while improving clamp load. The clutch pack features 80% thicker steel discs to resist premature wear. Rotatable cast-iron flanges reduce interference clearance issues, and a Positive Stop for driveline outputs eliminates oil seal damage from coupling. Call us to confirm proper fitment for your transmission application.
The 281 Series is an evolution of the Chelsea 280 Series PTO, purpose-built for applications demanding reliable hot-shift engagement on Allison automatic transmissions. 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. Not sure this is the right PTO for your truck? Give us a call and we can help confirm the correct fit.
Features
Ductile Iron Bearing Cap - 117% stronger than gray iron for durability under high vibration loads
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Enhanced Clutch Pack - 80% thicker steel discs resist premature tooth wear
Nine speed ratios available including low and high-speed selections
Wet Spline Lubrication option extends shaft life 7 to 10 times compared to standard configurations
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart option reduces shock load at engagement
Tech Specs
- Mounting Type: 10-Bolt aperture (Allison automatic transmissions)
- Shift Type: PowerShift - Hydraulic (hot shift)
- Continuous Duty: Yes - single continuous duty torque rating
- Series Continuous Torque: 390 lb-ft (529 Nm) - see application pages for actual rating
- Speed Ratios: Nine, including low and high speeds
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication Options: Pressure Lube (P) or Wet Spline (W)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM (28 kW at 500 RPM, 55 kW at 1000 RPM)
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO, purpose-built for applications demanding reliable hot-shift engagement on Allison automatic transmissions. 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. Not sure this is the right PTO for your truck? Give us a call and we can help confirm the correct fit.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
