Features
Hydraulic hot-shift (PowerShift) operation for Allison and Caterpillar 10-bolt automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with steel discs 80% thicker than prior design to resist premature tooth wear
Nine speed ratios including low and high speeds
Wet Spline Lubrication option extends shaft life 7 to 10 times compared to standard lubrication
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast-iron flanges reduce pump clearance interference; positive stop for driveline outputs eliminates oil seal damage
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic (PowerShift / Hot Shift)
- Compatible Transmission Manufacturer: Allison, Caterpillar
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Intermittent Torque: 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
- Speed Ratios: Nine (includes low and high speeds)
- Lubricant Options: Pressure Lube (P), Wet Spline (W)
- Continuous Operation: Yes
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
