Features
10-bolt mounting aperture for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) operation supports continuous-duty use
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap improves clamp load and resists vibration
80% thicker steel clutch pack discs reduce premature tooth wear
Nine speed ratios including low and high-speed ranges
Wet Spline Lubrication option extends shaft life 7 to 10 times over standard
Electronic Overspeed Control (EOC) protects driven equipment
SmartStart feature reduces shock load at engagement on applicable setups
Rotatable cast-iron flanges reduce pump clearance interference issues
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Speed Ratios: Nine (includes low and high speeds)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubricant Options: Pressure Lube, Wet Spline
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - see application pages for actual torque ratings
- Series Intermittent Torque: 301 to 400 lb-ft
- Series Output Power: 56+ HP (51+ kW)
- Series Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for applicable configurations
- Wet Spline Lubrication Option: Yes (7 to 10x greater shaft life)
Additional Information
The Chelsea 281 Series is suited for Fire and Rescue, Truck Cranes, Pumper Cleaner, and Refuse market applications. Relevant Parker Chelsea 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, which provide detailed application, installation, and parts reference information.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
