Features
Chelsea 281 Series PowerShift (hydraulic) hot-shift PTO for 10-bolt automatic transmission apertures
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high-speed options; continuous torque rating of 390 lb-ft (529 Nm)
Electronic Overspeed Control (EOC) and SmartStart option for driven-equipment protection and reduced start-up shock
Rotatable cast-iron flanges reduce pump-clearance interference; Wet Spline Lubrication option provides 7-10x greater shaft life
Tech Specs
- Mounting Type: 10-Bolt aperture (Allison and Caterpillar automatic transmissions)
- Shift Type: PowerShift - Hydraulic (hot shift)
- Continuous Torque: 390 lb-ft (529 Nm)
- Speed Ratios: Nine, including low and high speeds
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube or Wet Spline option
- Continuous Operation: Yes
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series platform, incorporating a ductile iron bearing cap, thicker clutch pack discs, and an improved o-ring seal, all designed to handle the increased vibration characteristics of modern engine designs. Compatible markets include fire and rescue, refuse, truck cranes, and pumper cleaner 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, published by Parker Chelsea.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
