281GGFJP-H3AC Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GGFJP-H3AC or 281GGFJPH3AC, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison transmissions. This series carries a continuous torque rating of 390 lb-ft and supports nine speed ratios spanning low and high ranges. Output options across the 281 Series include SAE B and SAE C pump flanges, ISO 7652 pump flanges, and driveline configurations. The 281 Series is an evolution of the 280 Series, introducing a ductile iron bearing cap rated 117% stronger than gray iron, an 80% thicker clutch pack, an o-ring housing seal, and an optional Wet Spline Lubrication system for extended shaft life. Common applications include fire and rescue, refuse, truck cranes, and pumper-cleaner equipment. Call us to confirm proper fit for your transmission.

Features

Hydraulic hot-shift (PowerShift) operation for use on automatic transmissions with a 10-bolt aperture
Ductile iron bearing cap, 117% stronger than gray iron compared to the previous 280 Series
Enhanced clutch pack with steel discs 80% thicker than the predecessor design
O-ring sealing configuration between housing and bearing cap to improve clamp load and resist vibration
Nine speed ratios available, covering both low and high-speed ranges
Electronic Overspeed Control (EOC) and optional SmartStart to reduce shock load at engagement
Wet Spline Lubrication option rated to provide 7 to 10 times greater shaft life
Rotatable cast-iron flanges reduce pump clearance interference; Positive Stop feature eliminates oil seal damage on driveline outputs

Tech Specs

• Mounting Type: 10-Bolt aperture
• Shift Type: PowerShift (Hydraulic hot-shift)
• Compatible Transmission Type: Allison automatic transmissions
• Continuous Torque Rating: 390 lb-ft (529 Nm)
• Speed Ratios: Nine ratios including 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 (option)
• Output Shaft Options: 3/4 in. 11T Pump Spline, SAE B 7/8 in. 13T Pump Spline, SAE C 1-1/4 in. 14T Pump Spline, SmartStart Round Shaft 1-1/4 in. with 5/16 in. Key
• Series: Chelsea 281 Series (evolution of the 280 Series)

Additional Information

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