Features
Ductile Iron Bearing Cap - 117% stronger than gray iron for increased durability
Enhanced Clutch Pack - 80% thicker steel discs resist premature tooth wear
Improved Seal - O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
10-Bolt Mounting - Designed for Allison and Caterpillar automatic transmissions
Nine Speed Ratios - Covers both low and high speed ranges
Wet Spline Lubrication Option - Provides 7 to 10 times greater shaft life
SmartStart - Reduces shock load at start-up for certain applications
Electronic Overspeed Control (EOC) - Protects driven equipment from overspeed damage
Positive Stop for Driveline Outputs - Eliminates oil seal damage from coupling
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) - Hot Shift
- Continuous Operation: Yes
- Transmission Application: Allison and Caterpillar automatic transmissions
- Output Type: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine ratios including low and high speeds
- Continuous Torque Rating: 390 lb-ft (529 Nm) - see application pages for actual torque ratings
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1,000 RPM (28 kW at 500 RPM / 55 kW at 1,000 RPM)
- Lubrication: Pressure Lube or Wet Spline option
- Series: Chelsea 281 Series (evolution of the 280 Series)
Additional Information
Reference Documents: 281/288 Series Parts List (HY25-2281-M1/US); 267/281/288/871/878 Series Owner's Manual; 281 Series Sales Literature; Chelsea PTO Stud Kits (HY25-2002-M1_US).
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
