Features
10-Bolt mounting aperture for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) operation for continuous-duty use
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high speeds; Wet Spline Lubrication option extends shaft life 7 to 10 times
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Positive Stop for driveline outputs eliminates oil seal damage from coupling; hose included
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Continuous Operation: Yes
- Compatible Transmissions: Allison, Caterpillar (10-bolt aperture)
- Speed Ratios: Nine, including low and high speeds
- Continuous Torque Rating (series): 390 lb-ft (529 Nm)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubricant Options: Pressure Lube (P), Wet Spline (W)
- Shaft Life Improvement (Wet Spline option): 7 to 10 times greater than standard
Additional Information
The Chelsea 281 Series PTO is referenced in Parker documents including the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Applications include fire and rescue, truck cranes, refuse trucks, and pumper cleaner equipment. The Positive Stop feature for driveline outputs prevents oil seal damage caused by coupling contact. Electronic Overspeed Control (EOC) is available to protect driven equipment from overspeed conditions. SmartStart reduces driveline shock at engagement for applicable configurations.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
