The Chelsea 281 Series Power Take-Off, part number 281GCFJP-B3BD or 281GCFJPB3BD, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. It carries a single, continuous duty torque rating and offers nine speed ratios spanning low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, and the clutch pack features steel disks 80% thicker than the predecessor 280 Series design. Rotatable cast-iron flanges reduce interference clearance issues, while the o-ring sealing configuration between the housing and bearing cap improves clamp load and resists the vibrational effects of modern engine designs. Electronic Overspeed Control (EOC) and an optional Wet Spline Lubrication system round out the protection features. Call us to confirm proper fit for your transmission and application.
The Chelsea 281 Series is an evolution of the 280 Series PTO platform, engineered for Fire and Rescue, Truck Cranes, Pumper Cleaner, and Refuse market applications. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. When the Wet Spline Lubrication option is specified, shaft service life increases 7 to 10 times compared to a dry spline configuration. The included hose eliminates the need to source it separately. Reference documents: 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual are available from Parker Chelsea for detailed application and installation guidance.
Features
10-bolt mounting aperture, compatible with Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) operation for continuous-duty use
Ductile iron bearing cap rated 117% stronger than gray iron
Clutch pack steel disks increased 80% in thickness over the 280 Series predecessor
Nine speed ratios available, covering both low and high speed ranges
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at engagement
Tech Specs
- Mounting: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Compatible Transmissions: Allison, Caterpillar (automatic, 10-bolt aperture)
- Continuous Operation: Yes
- Speed Ratios: Nine (includes low and high speeds)
- Bearing Cap Material: Ductile iron (117% stronger than gray iron)
- Sealing: O-ring configuration between housing and bearing cap
- Wet Spline Lubrication: Optional (provides 7 to 10 times greater shaft life)
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for select applications
- Series Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application page
- Output Options: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series PTO platform, engineered for Fire and Rescue, Truck Cranes, Pumper Cleaner, and Refuse market applications. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. When the Wet Spline Lubrication option is specified, shaft service life increases 7 to 10 times compared to a dry spline configuration. The included hose eliminates the need to source it separately. Reference documents: 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual are available from Parker Chelsea for detailed application and installation guidance.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
