Description
Chelsea part 281GDFJW-B3RK or 281GDFJWB3RK is a 281 Series Power Take-Off assembly, hydraulically shifted (PowerShift) and designed for continuous-duty operation on automatic transmissions with a 10-bolt aperture, commonly Allison applications. 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 to reduce vibration and improve clamp load, and an enhanced clutch pack with 80% thicker steel discs for resistance against premature tooth wear. Nine speed ratios span both low and high ranges. Rotatable cast-iron flanges reduce pump clearance conflicts, and the Wet Spline Lubrication option extends shaft life 7 to 10 times over standard configurations. Call us to confirm proper fit for your application.
Features
Hydraulic hot-shift (PowerShift) operation for use on 10-bolt aperture automatic transmissions including Allison
Ductile iron bearing cap, 117% stronger than gray iron, replacing the predecessor gray iron cap
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel discs resists premature tooth wear
Nine speed ratios available, covering both low and high speed ranges
Wet Spline Lubrication option extends output shaft service life 7 to 10 times; SmartStart reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt aperture
- Shift Type: PowerShift (Hydraulic hot-shift)
- Continuous Operation: Yes
- Transmission Application: Allison automatic transmissions
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) – verify actual rating on application page
- Speed Ratios: Nine ratios, including low and high speeds
- Lubricant Options: Pressure Lube or Wet Spline
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Part Number: 281GDFJW-B3RK or 281GDFJWB3RK
Additional Information
Common markets for the 281 Series include fire and rescue apparatus, truck cranes, pumper cleaners, and refuse vehicles. The 281 Series is supported by Parker Chelsea documentation including the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner’s Manual. Rotatable cast-iron output flanges allow adjustment to clear pump installations without repositioning the entire unit. The Positive Stop feature on driveline outputs eliminates oil seal damage that can result from coupling contact.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
