Features
Hydraulic PowerShift (hot-shift) engagement for continuous-duty operation
10-bolt mounting aperture, compatible with Allison automatic transmissions
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with steel discs 80% thicker than predecessor generation
Rotatable cast-iron flanges reduce pump clearance interference; Positive Stop feature eliminates oil seal damage on driveline outputs
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
Nine speed ratios including low and high-speed options
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) - Hot Shift
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm)
- Speed Ratios: Nine, including low and high speeds
- Compatible Transmission Type: Allison automatic (10-bolt aperture)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube or Wet Spline options
Additional Information
Reference 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. Markets served 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.
