Features
Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission apertures, including Allison and Caterpillar
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
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios available, spanning low and high speed ranges
Wet spline lubrication option extends shaft life 7 to 10 times compared to standard
Electronic Overspeed Control (EOC) protects driven equipment from overspeed damage
SmartStart feature reduces shock load at start-up on applicable configurations
Rotatable cast-iron flanges reduce pump clearance interference issues
Positive stop for driveline outputs eliminates oil seal damage from coupling
Tech Specs
- Mounting Type: 10-Bolt aperture
- Shift Type: Hydraulic PowerShift (hot-shift)
- Compatible Transmissions: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Speed Ratios: Nine (including low and high speeds)
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Lubrication: Pressure lube (P) or wet spline (W) options
- Bearing Cap Material: Ductile iron
- Electronic Overspeed Control (EOC): Included
Additional Information
The 281 Series is designed for demanding continuous-duty markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Compatible 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, available from Parker Chelsea.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
