The Chelsea 281 Series Power Take-Off, part number 281GMFJP-G5XD or 281GMFJPG5XD, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. It carries a single, continuous duty torque rating and offers nine speed ratios covering both low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, and the enhanced clutch pack uses steel discs 80% thicker than the previous 280 Series design. Rotatable cast iron flanges reduce pump clearance interference. The wet spline lubrication option delivers 7 to 10 times greater shaft life. Electronic Overspeed Control (EOC) and SmartStart are available to protect driven equipment and reduce start-up shock load. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The 281 Series is an evolution of the Chelsea 280 Series PTO, incorporating structural and sealing upgrades designed to handle the vibrational demands of modern engine designs. Typical markets include fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. The hose is included with the assembly, eliminating a separate order. A positive stop on driveline outputs eliminates oil seal damage from coupling. Parker Chelsea documents available 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.
Features
Hydraulic hot-shift (PowerShift) operation for 10-bolt automatic transmission apertures, including Allison and Caterpillar
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with steel discs 80% thicker than the 280 Series design
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high speeds
Wet spline lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic (PowerShift / Hot Shift)
- Compatible Transmissions: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Speed Ratios: Nine (includes low and high speeds)
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Lubrication: Pressure lube or wet spline option
- Series Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application page
- Series Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO, incorporating structural and sealing upgrades designed to handle the vibrational demands of modern engine designs. Typical markets include fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. The hose is included with the assembly, eliminating a separate order. A positive stop on driveline outputs eliminates oil seal damage from coupling. Parker Chelsea documents available 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.
