The Chelsea 281GDFJW-B5RF or 281GDFJWB5RF is a hydraulically shifted, hot-shift power take-off from Chelsea's 281 Series, engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar platforms. The 281 Series is an evolution of the proven 280 Series, adding a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap for improved clamp load, and an 80% thicker clutch pack to resist premature tooth wear. Nine speed ratios span low and high ranges. The wet spline lubrication option extends shaft life by 7 to 10 times. SmartStart reduces shock load at engagement, and Electronic Overspeed Control (EOC) protects downstream driven equipment. Rotatable cast-iron flanges reduce interference at pump mounting. Call us to confirm proper fit for your specific transmission and application.
The Chelsea 281 Series is suited for demanding duty cycles in fire and rescue, truck crane, pumper cleaner, and refuse applications. Rotatable cast-iron flanges reduce pump-clearance interference, and the positive stop for driveline outputs eliminates oil seal damage from coupling. Cross-reference: also listed as SP281GDFJW-B5RF. Refer to Chelsea document 281/288 Series Parts List HY25-2281-M1/US and the 267/281/288/871/878 Series Owner's Manual for full application and installation details.
Features
Hydraulic hot-shift (PowerShift) operation for Allison and Caterpillar 10-bolt automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibration effects and improves clamp load
80% thicker steel discs in clutch pack resist premature tooth wear
Wet spline lubrication option provides 7 to 10 times greater shaft life
Nine speed ratios covering low and high ranges; SmartStart reduces engagement shock load; EOC protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Compatible Transmissions: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Speed Ratios: Nine (including low and high speeds)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubricant Options: Pressure Lube, Wet Spline
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for certain applications
- Hose: Included
Additional Information
The Chelsea 281 Series is suited for demanding duty cycles in fire and rescue, truck crane, pumper cleaner, and refuse applications. Rotatable cast-iron flanges reduce pump-clearance interference, and the positive stop for driveline outputs eliminates oil seal damage from coupling. Cross-reference: also listed as SP281GDFJW-B5RF. Refer to Chelsea document 281/288 Series Parts List HY25-2281-M1/US and the 267/281/288/871/878 Series Owner's Manual for full application and installation details.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
