The Chelsea 281GPFJW-B5RF or 281GPFJWB5RF is a hydraulically shifted (PowerShift) Power Take-Off from the Chelsea 281 Series, designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications such as fire and rescue, refuse, truck cranes, and pumper/cleaner equipment. The 281 Series is an evolution of the 280 Series, featuring 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 Enhanced Clutch Pack with steel discs 80% thicker than the previous design. Nine speed ratios cover low and high speed needs, and the wet spline lubrication option extends shaft life by 7 to 10 times. Electronic Overspeed Control (EOC) protects driven equipment, while SmartStart reduces shock load at start-up on compatible applications. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your transmission and application.
Features
Ductile Iron Bearing Cap: 117% stronger than gray iron for greater durability
Improved Seal: O-ring configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced Clutch Pack: Steel discs 80% thicker than the previous 280 Series design to resist premature tooth wear
Nine Speed Ratios: Covers both low and high speed output requirements
Wet Spline Lubrication Option: Provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC): Protects driven equipment; SmartStart reduces shock load at engagement
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM
- Speed Ratios: Nine ratios including low and high speed
- Lubrication: Pressure lube and wet spline options
- Output Types Available: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Positive Stop for Driveline Outputs: Yes - eliminates oil seal damage from coupling
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for certain applications
- Markets: Fire and Rescue, Refuse, Truck Cranes, Pumper/Cleaner
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
