The Chelsea 281 Series Power Take-Off Assembly, part number 281GDFJP-S5RK or 281GDFJPS5RK, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison applications. The 281 Series is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron and an 80% thicker clutch pack steel disc for improved resistance to premature tooth wear. An o-ring sealing configuration between the housing and bearing cap reduces vibrational effects and improves clamp load. Nine speed ratios cover both low and high-speed demands. Cross-references include 280GDFJP-S5RK or 280GDFJPS5RK. Sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 281 Series is suited for Fire and Rescue, Truck Cranes, Pumper Cleaner, and Refuse applications. Rotatable cast-iron flanges reduce interference issues and improve pump clearance. The positive stop for driveline outputs eliminates oil seal damage from coupling. Hose is included with this assembly. Refer to the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for detailed service and application guidance.
Features
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel discs to resist 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) protects driven equipment; SmartStart reduces shock load at start-up for certain applications
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Continuous Operation: Yes
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Speed Ratios: Nine, including low and high speeds
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication Options: Pressure Lube (P), Wet Spline (W)
- Cross-Reference: 280GDFJP-S5RK or 280GDFJPS5RK, 3252PCN633SA
Additional Information
The Chelsea 281 Series is suited for Fire and Rescue, Truck Cranes, Pumper Cleaner, and Refuse applications. Rotatable cast-iron flanges reduce interference issues and improve pump clearance. The positive stop for driveline outputs eliminates oil seal damage from coupling. Hose is included with this assembly. Refer to the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for detailed service and application guidance.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
