The Chelsea 281 Series Power Take-Off Assembly, part number 281GPFJP-B5RF or 281GPFJPB5RF, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. It mounts via a 10-bolt pattern and offers nine speed ratios covering both low and high ranges. The series carries a continuous torque rating of 390 lb-ft (529 Nm). Key design upgrades over the 280 Series include a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap to improve clamp load, and an 80% thicker clutch pack steel disk for reduced tooth wear. Rotatable cast-iron flanges ease pump clearance issues, and the wet spline lubrication option extends shaft life by 7 to 10 times. Call us to confirm proper fit for your transmission and application.
The 281 Series is suited for demanding markets including fire and rescue, truck cranes, pumper cleaner, and refuse applications. 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. The part number 281GPFJP-B5RF is also referenced as SP281GPFJP-B5RF in certain catalog listings.
Features
10-bolt mounting pattern for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) operation for engagement under load
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap improves clamp load and resists vibration
80% thicker clutch pack steel disks 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
Electronic Overspeed Control (EOC) and SmartStart shock-load reduction available
Hose included - no separate hose order required
Tech Specs
- Mounting: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Continuous Torque: 390 lb-ft (529 Nm)
- Compatible Transmissions: Allison, Caterpillar (10-bolt aperture)
- Speed Ratios: Nine, including low and high
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube or Wet Spline options
- Series: Chelsea 281 (evolution of 280 Series)
Additional Information
The 281 Series is suited for demanding markets including fire and rescue, truck cranes, pumper cleaner, and refuse applications. 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. The part number 281GPFJP-B5RF is also referenced as SP281GPFJP-B5RF in certain catalog listings.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
