Features
Hydraulic (PowerShift) hot-shift operation for 10-bolt automatic transmissions including Allison
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing between housing and bearing cap reduces vibration effects and improves clamp load
80% thicker steel discs in the clutch pack resist premature tooth wear
Nine speed ratios including low and high speeds
Electronic Overspeed Control (EOC) protects driven equipment from overspeed damage
Wet spline lubrication option provides 7 to 10 times greater shaft life
SmartStart feature reduces shock load at start-up for compatible applications
Positive stop for driveline outputs eliminates oil seal damage from coupling
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Series Shaft Power: 37 HP at 500 RPM, 74 HP at 1,000 RPM
- Speed Ratios: Nine, including low and high
- Lubrication: Wet Spline option available
- SmartStart: Yes, for applicable configurations
- Electronic Overspeed Control (EOC): Included
Additional Information
The Chelsea 281 Series is designed for demanding PTO markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Supporting documentation includes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, available through Parker Chelsea.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
