Features
10-bolt mounting aperture, compatible with Allison automatic transmissions
Hydraulic PowerShift (hot-shift) operation for engagement under load
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal configuration between housing and bearing cap improves clamp load and reduces vibrational effects
80% thicker steel discs in the clutch pack resist premature tooth wear
Nine speed ratios available, covering both low and high speed ranges
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)
- Transmission Compatibility: Allison automatic transmissions
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application page
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine, including low and high
- Lubrication Options: Pressure Lube, Wet Spline
- SmartStart: Available
- Electronic Overspeed Control (EOC): Available
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO. Markets served include Fire and Rescue, Truck Cranes, Pumper Cleaner, and Refuse applications. Reference documents 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.
