The Chelsea 281 Series Power Take-Off, part number 281GSFJP-G3XD or 281GSFJPG3XD, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. It is an evolution of the proven 280 Series, incorporating a ductile iron bearing cap rated 117% stronger than gray iron and an o-ring sealing configuration between the housing and bearing cap to improve clamp load and reduce vibrational effects. The clutch pack features steel discs that are 80% thicker than the predecessor design. Nine speed ratios cover both low and high ranges, and the Wet Spline Lubrication option delivers 7 to 10 times greater shaft life. Electronic Overspeed Control (EOC) protects driven equipment, and SmartStart reduces shock load at engagement for compatible applications. Call us to confirm proper fit for your transmission and output configuration.
The Chelsea 281 Series is an upgrade to the 280 Series platform, purpose-built for demanding continuous-duty applications including fire and rescue, refuse, truck cranes, and pumper cleaner equipment. Rotatable cast-iron flanges reduce interference issues and improve pump clearance. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. SmartStart technology softens the shock load at engagement for applicable configurations, while Electronic Overspeed Control (EOC) provides a layer of protection for driven equipment. Hose is included with the assembly. Refer to Parker Chelsea documents 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for detailed application and parts information. Call Pro Gear and Transmission to confirm the correct output shaft type and gear ratio for your specific application.
Features
Hydraulic PowerShift (hot-shift) operation for Allison 10-bolt automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap reduces vibrational effects and improves clamp load
Clutch pack steel discs 80% thicker than 280 Series for reduced premature tooth wear
Nine speed ratios including low and high ranges
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces engagement shock load; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot Shift)
- Continuous Operation: Yes
- Compatible Transmission Manufacturer: Allison
- Output Type: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine (including low and high)
- Continuous Torque Rating (Series): 390 lb-ft / 529 Nm (confirm actual rating for your application)
- Intermittent Torque Range (Series): 301-400 lb-ft / 501+ Nm
- Output Power (Series): 56+ HP / 51+ kW
- Shaft Power (Series): 37 HP at 500 RPM, 74 HP at 1000 RPM
- Lubrication: Pressure Lube and Wet Spline options available
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
The Chelsea 281 Series is an upgrade to the 280 Series platform, purpose-built for demanding continuous-duty applications including fire and rescue, refuse, truck cranes, and pumper cleaner equipment. Rotatable cast-iron flanges reduce interference issues and improve pump clearance. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. SmartStart technology softens the shock load at engagement for applicable configurations, while Electronic Overspeed Control (EOC) provides a layer of protection for driven equipment. Hose is included with the assembly. Refer to Parker Chelsea documents 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for detailed application and parts information. Call Pro Gear and Transmission to confirm the correct output shaft type and gear ratio for your specific application.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
