Features
Ductile iron bearing cap - 117% stronger than gray iron for increased durability
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios including both low and high-speed ranges
Rotatable cast-iron flanges reduce interference and improve pump clearance
Wet Spline Lubrication option delivers 7 to 10 times greater shaft life
Positive Stop for driveline outputs eliminates oil seal damage from coupling
SmartStart feature reduces shock load at start-up for applicable setups
Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) - Hot Shift
- Compatible Transmissions: Allison and Caterpillar automatics with 10-bolt aperture
- Continuous Operation: Yes
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - check application pages for actual torque
- Series Intermittent Torque Range: 301 to 400 lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM (28 kW at 500 RPM / 55 kW at 1000 RPM)
- Speed Ratios: Nine, including low and high
- Lubrication: Wet Spline option available
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
