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 improves clamp load and resists vibration
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios available, spanning low and high-speed ranges
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart feature reduces shock load at engagement; 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
- Shift Type: Hydraulic PowerShift (hot-shift)
- Mounting Type: 10-bolt aperture
- Compatible Transmissions: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Speed Ratios: Nine ratios, including low and high speeds
- Lubrication Options: Pressure Lube (P) or Wet Spline (W)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
Additional Information
The Chelsea 281 Series represents the next generation of the proven 280 Series platform. Design improvements target the damaging vibrational effects associated with modern engine configurations. Applicable markets include fire and rescue, refuse, pumper cleaner, and truck crane installations. Supporting 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 through Parker Chelsea.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
