281GPFJW-B3RF Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GPFJW-B3RF or 281GPFJWB3RF, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. It delivers nine speed ratios spanning low and high ranges, with a single continuous duty torque rating up to 390 lb-ft. The 281 Series is an evolution of the 280 Series, bringing a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap, and an 80% thicker clutch pack for improved resistance to premature tooth wear. SmartStart reduces shock load at engagement, and Electronic Overspeed Control (EOC) protects connected equipment. Wet Spline lubrication provides 7 to 10 times greater shaft life. Call us to confirm proper fit for your transmission and application.

Features

Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission apertures, including Allison and Caterpillar
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibration
80% thicker steel discs in the clutch pack resist premature tooth wear
Nine speed ratios including low and high speeds; single continuous duty torque rating up to 390 lb-ft
SmartStart reduces engagement shock load; Electronic Overspeed Control (EOC) protects driven equipment
Wet Spline lubrication option extends shaft life 7 to 10 times over standard; rotatable cast-iron flanges reduce pump clearance issues

Tech Specs

• Mounting Type: 10-Bolt aperture (Allison and Caterpillar automatic transmissions)
• Shift Type: Hydraulic PowerShift (hot-shift)
• Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application page
• Speeds: Nine speed ratios (low and high range)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubrication: Pressure Lube or Wet Spline option
• Continuous Operation: Yes
• Electronic Overspeed Control (EOC): Included
• SmartStart: Available for applicable configurations

Additional Information

The Chelsea 281 Series is designed for demanding markets including fire and rescue, refuse, truck crane, and pumper cleaner applications. The 281 Series parts list is documented under Parker reference HY25-2281-M1/US. Service and installation information is covered in the 267/281/288/871/878 Series Owner's Manual. Part number 281GPFJW-B3RF is also referenced as SP281GPFJW-B3RF in distributor documentation.

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