281GDFJW-B5RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GDFJW-B5RK or 281GDFJWB5RK, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. An evolution of the 280 Series, the 281 features a ductile iron bearing cap rated 117% stronger than gray iron, an 80% thicker clutch pack steel disc design to resist premature tooth wear, and an O-ring sealing configuration between the housing and bearing cap for improved clamp load. Nine speed ratios cover both low- and high-speed applications. A Wet Spline Lubrication option extends shaft life by 7 to 10 times. SmartStart reduces shock load at engagement, and Electronic Overspeed Control (EOC) protects driven equipment. Common markets include fire and rescue, refuse, truck cranes, and pumper-cleaner trucks. Call us to confirm proper fit for your transmission and application.

Features

Hydraulic PowerShift (hot-shift) operation for Allison and Caterpillar 10-bolt automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
80% thicker steel discs in the clutch pack to resist premature tooth wear
O-ring seal between housing and bearing cap improves clamp load and resists vibration
Nine speed ratios including low- and high-speed options
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart feature reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic PowerShift (Hot Shift)
• Compatible Transmissions: Allison automatic transmissions (10-bolt aperture)
• Continuous Operation: Yes
• Speed Ratios: Nine (includes low and high speeds)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubrication: Pressure Lube or Wet Spline (series options)
• NMFC Code: 125820 - Hydraulic PTOs, Pumps, Motors, etc.

Additional Information

The Chelsea 281 Series is suited for demanding duty cycles in fire and rescue, refuse, truck crane, and pumper-cleaner applications. Rotatable cast-iron flanges reduce interference clearance issues at the pump mounting face. The Positive Stop feature on driveline outputs eliminates oil seal damage caused by coupling contact. Parker Chelsea documents applicable to this series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Call us to confirm which speed ratio and output shaft configuration matches your chassis and hydraulic system.

Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices