281GKFJW-B5RY Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off Assembly, part number 281GKFJW-B5RY or 281GKFJWB5RY, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. The 281 Series evolves directly from the proven 280 Series platform with 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 cover both low and high speed demands, and the Wet Spline Lubrication option extends shaft life by 7 to 10 times. Electronic Overspeed Control (EOC) protects driven equipment, while the SmartStart feature reduces shock load at engagement. Rotatable cast-iron flanges reduce interference clearance issues, and a positive stop on driveline outputs eliminates oil seal damage. Call us to confirm proper fit for your transmission and application.

Features

Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap for improved clamp load and vibration resistance
80% thicker steel discs in the clutch pack 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 from overspeed events
SmartStart feature reduces shock load at engagement for applicable configurations
Rotatable cast-iron flanges reduce pump clearance interference
Positive stop on driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic Hot-Shift)
• Transmission Compatibility: Allison and Caterpillar automatic transmissions (10-bolt aperture)
• Continuous Operation: Yes
• Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
• Output Types Available in Series: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Speed Ratios: Nine, including low and high speeds
• Lubrication: Wet Spline option available
• Series Output Power: 56+ HP (51+ kW)

Additional Information

The Chelsea 281 Series is used across demanding markets including fire and rescue, truck cranes, pumper cleaner, and refuse applications. The series parts list is documented under Parker publication HY25-2281-M1/US, and the owner's manual covers the 267, 281, 288, 871, and 878 Series collectively. Call us to confirm that part number 281GKFJW-B5RY is the correct configuration for your specific transmission and driven equipment.

Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.