281GPFJP-B3RY Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GPFJP-B3RY or 281GPFJPB3RY, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. This series delivers a continuous torque rating of 390 lb-ft (529 Nm) and offers nine speed ratios covering both low and high ranges. Output options span SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. The 281 Series is an evolution of the 280 Series, adding a ductile iron bearing cap rated 117% stronger than gray iron, an 80% thicker clutch pack for extended service life, and an O-ring sealing configuration between the housing and bearing cap to counter vibrational effects from modern engine designs. Markets served include fire and rescue, refuse, pumper cleaner, and truck crane applications. Call us to confirm proper fit for your application.

Features

Hydraulic hot-shift (PowerShift) operation for 10-bolt automatic transmission apertures including Allison
Ductile iron bearing cap, 117% stronger than gray iron predecessor
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
Rotatable cast-iron flanges reduce pump clearance interference; positive stop for driveline outputs eliminates oil seal damage
Wet Spline Lubrication option provides 7-10 times greater shaft life; SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting Type: 10-Bolt aperture
• Shift Type: Hydraulic hot-shift (PowerShift)
• Compatible Transmissions: Allison, Caterpillar (10-bolt aperture)
• Continuous Torque: 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
• Output Shaft Options: 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, SmartStart round shaft (1-1/4 in., 5/16 in. key), 1410 companion flange, DIN flange options
• Lubrication: Pressure lube or Wet Spline option
• Series: Chelsea 281 (evolution of the 280 Series)
• Part Number: 281GPFJP-B3RY or 281GPFJPB3RY

Additional Information

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