Features
Hydraulic hot-shift (PowerShift) operation for use on 10-bolt aperture automatic transmissions including Allison
Ductile iron bearing cap rated 117% stronger than gray iron for increased durability
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Clutch pack steel discs increased 80% in thickness to resist premature tooth wear
Nine speed ratios covering low and high speed ranges
Wet Spline Lubrication option engineered to extend shaft life 7 to 10 times compared to standard lubrication
SmartStart feature reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Shift Type: Hydraulic (PowerShift / Hot-Shift)
- Mounting: 10-Bolt aperture
- Transmission Compatibility: Allison automatic transmissions
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Speed Ratios: Nine ratios, including low and high
- Lubrication: Wet Spline option available
- Series Output Power: 56+ HP (51+ kW)
- Series Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM
- Continuous Operation: Yes
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
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.
