Features
Ductile Iron Bearing Cap - 117% stronger than gray iron versus predecessor 280 Series cap
Enhanced Clutch Pack - steel discs are 80% thicker to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Hydraulic hot-shift (PowerShift) operation - mounts to 10-bolt transmission aperture
Nine speed ratios available, including dedicated low and high speed options
Wet Spline Lubrication option extends shaft service life 7 to 10 times compared to standard lubrication
SmartStart reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Compatible Transmission Manufacturers: Allison, Caterpillar (10-bolt aperture)
- Series Continuous Torque Rating: 390 lb-ft (529 Nm)
- Speed Ratios: Nine ratios, including low and high speeds
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Lubrication: Pressure Lube or Wet Spline option
- Continuous Operation: Yes
Additional Information
The Chelsea 281 Series is designed for demanding duty cycles in fire and rescue, refuse, truck crane, and pumper-cleaner applications. The rotatable cast-iron flanges reduce interference during pump installation, and the Positive Stop feature for driveline outputs eliminates oil seal damage from coupling contact. A hose is included with the assembly. Electronic Overspeed Control (EOC) is available to protect driven equipment from overspeed events. Parker Chelsea publishes the 281/288 Series Parts List (HY25-2281-M1/US) and a combined 267/281/288/871/878 Series Owner's Manual for full service reference.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
