281GMFJW-B8RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GMFJW-B8RK or 281GMFJWB8RK, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, commonly matched to Allison and Caterpillar transmissions. It carries a continuous torque rating of 390 lb-ft (529 Nm) and delivers output through nine speed ratios covering both low- and high-speed ranges. The 281 Series builds on 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, and an enhanced clutch pack with 80% thicker steel discs to resist premature wear. Wet Spline lubrication provides 7 to 10 times greater shaft life, and Electronic Overspeed Control (EOC) protects driven equipment. Call us to confirm proper fit for your specific transmission and application.

Features

Chelsea 281 Series hydraulic PowerShift (hot-shift) PTO, 10-bolt mounting for Allison and Caterpillar automatic transmissions
Continuous torque rating: 390 lb-ft (529 Nm)
Nine speed ratios including low- and high-speed ranges
Ductile iron bearing cap - 117% stronger than gray iron; o-ring sealing configuration improves clamp load and reduces vibrational effects
Enhanced clutch pack with 80% thicker steel discs; Wet Spline lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment; Positive Stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic / Hot-Shift)
• Compatible Transmissions: Allison and Caterpillar automatic transmissions
• Continuous Torque Rating: 390 lb-ft (529 Nm)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Speed Ratios: Nine (including low and high)
• Lubrication: Pressure Lube (P) or Wet Spline (W) options
• Output Power: 56+ HP (51+ kW)
• Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM
• Part Number: 281GMFJW-B8RK or 281GMFJWB8RK

Additional Information

The Chelsea 281 Series is suited for demanding vocational applications including fire and rescue, truck cranes, pumper cleaner, and refuse equipment. Rotatable cast-iron flanges reduce interference issues with pump clearance. The hose for hydraulic shift is included with the assembly. Reference documents: 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual are available from Parker Chelsea for full application and installation detail.

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