Features
10-Bolt mounting for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) engagement for continuous operation
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing between housing and bearing cap improves clamp load and resists vibration
80% thicker steel clutch pack discs to reduce premature tooth wear
Nine speed ratios including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Rotatable cast iron flanges reduce interference and improve pump clearance
SmartStart feature reduces shock load at start-up
Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting: 10-Bolt
- Shift Type: PowerShift (Hydraulic), hot-shift
- Continuous Operation: Yes
- Transmission Compatibility: Allison, Caterpillar (10-bolt aperture)
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application page
- Speed Ratios: Nine, including low and high
- 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 PTO is engineered for demanding vocational markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. The series evolved from the proven 280 Series platform with structural and sealing improvements aimed at the vibrational loads imposed by modern engine designs. A Positive Stop for driveline outputs eliminates oil seal damage from coupling. Electronic Overspeed Control (EOC) provides an additional layer of protection for driven hydraulic equipment. Parker Chelsea reference 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.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
