281GCFJR-K5RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GCFJR-K5RK or 281GCFJRK5RK, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly used on Allison transmissions. Built as an evolution of the 280 Series, the 281 Series features a ductile iron bearing cap rated 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 speed ratios cover both low and high-speed applications. Rotatable cast-iron flanges reduce interference clearance issues. Common markets include fire and rescue, truck cranes, refuse, and pumper cleaner equipment. Call us to confirm proper fit for your application.

Features

Ductile Iron Bearing Cap: 117% stronger than gray iron for improved durability
O-Ring Sealing Configuration: reduces vibrational effects and improves clamp load between housing and bearing cap
Enhanced Clutch Pack: steel discs are 80% thicker than the predecessor 280 Series to resist premature tooth wear
Nine Speed Ratios: includes both low and high-speed settings
Wet Spline Lubrication Option: provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC): SmartStart feature reduces shock load at start-up; EOC protects driven equipment from overspeed damage

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic Hot-Shift)
• Compatible Transmission Type: Automatic (10-bolt aperture, including Allison)
• Continuous Operation: Yes
• Series Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application page
• Series Intermittent Torque: 301 to 400 lb-ft
• Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubrication: Pressure Lube or Wet Spline options
• Speed Ratios: Nine (includes low and high)
• Output Power: 56+ HP (51+ kW)
• Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM

Additional Information

The Chelsea 281 Series is suited for demanding duty cycles in fire and rescue, refuse, truck crane, and pumper cleaner applications. The series supports multiple output shaft types including a SmartStart round shaft (1-1/4 in. with 5/16 in. key), 3/4 in. 11-tooth pump spline, SAE B 7/8 in. 13-tooth pump spline, SAE C 1-1/4 in. 14-tooth pump spline, DIN 5462 pump spline, and companion flange options. Positive stop on driveline outputs eliminates oil seal damage from coupling. Hose 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 detailed installation and application guidance.

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