281GCFJW-B8RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GCFJW-B8RK or 281GCFJWB8RK, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, commonly used on Allison and Caterpillar transmissions. The 281 Series is an evolution of the 280 Series, built around a ductile iron bearing cap that is 117% stronger than gray iron, an O-ring sealing configuration between housing and bearing cap for improved clamp load, and an enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear. Nine available speed ratios cover both low and high ranges. Rotatable cast-iron flanges reduce pump clearance interference, and a Wet Spline Lubrication option delivers 7 to 10 times greater shaft life. SmartStart reduces shock load at engagement, and the Electronic Overspeed Control (EOC) protects connected equipment. Common markets include fire and rescue, refuse, truck cranes, and pumper-cleaner applications. Call us to confirm proper fit for your transmission application.

Features

Chelsea 281 Series hydraulic PowerShift (hot-shift) PTO for 10-bolt automatic transmission apertures
Ductile iron bearing cap - 117% stronger than gray iron for increased durability
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Nine speed ratios available including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces engagement shock load
Rotatable cast-iron flanges reduce pump clearance interference; Positive Stop for driveline outputs eliminates oil seal damage

Tech Specs

• Mounting Type: 10-Bolt aperture
• Shift Type: Hydraulic PowerShift (hot-shift)
• Continuous Operation: Yes
• Speed Ratios: Nine ratios including low and high speeds
• Bearing Cap Material: Ductile iron - 117% stronger than gray iron
• Clutch Pack: 80% thicker steel discs vs. predecessor
• Shaft Lubrication Option: Wet Spline - 7 to 10 times greater shaft life
• Compatible Transmission Types: Allison and Caterpillar automatic transmissions (10-bolt aperture)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Electronic Protection: Electronic Overspeed Control (EOC)

Additional Information

The 281 Series builds on the proven 280 Series platform with structural and sealing improvements targeting the vibrational stresses generated by modern engine designs. Typical markets include fire and rescue, refuse collection, truck cranes, and pumper-cleaner trucks. Parker Chelsea reference documents for this series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Part number 281GCFJW-B8RK is also referenced as SP281GCFJW-B8RK in some catalog systems.

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