281GTFJP-G3RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GTFJP-G3RK or 281GTFJPG3RK, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. It carries a continuous torque rating of 390 lb-ft and delivers output power of 56+ HP, with nine speed ratios covering both low and high ranges. The 281 Series evolved from the proven 280 Series with a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap for improved clamp load, and steel clutch discs that are 80% thicker to resist premature tooth wear. Rotatable cast-iron flanges reduce interference fit issues, and the Wet Spline Lubrication option extends shaft life by 7 to 10 times compared to standard lubrication. Electronic Overspeed Control (EOC) and the SmartStart feature further protect driven equipment and reduce shock loads at start-up. Common applications include fire and rescue, refuse, truck cranes, and pumper-cleaner trucks. Call us to confirm proper fit for your specific transmission and application.

Features

Hydraulic PowerShift (hot-shift) operation for automatic transmissions with 10-bolt aperture
Ductile iron bearing cap, 117% stronger than gray iron, for extended durability
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Enhanced clutch pack with steel discs 80% thicker than the predecessor 280 Series to resist premature tooth wear
Nine speed ratios including low and high speeds; continuous torque rating of 390 lb-ft
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

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic PowerShift (Hot-Shift)
• Continuous Torque: 390 lb-ft (529 Nm)
• Output Power: 56+ HP (51+ kW)
• Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM
• Speed Ratios: Nine ratios including low and high
• Compatible Transmissions: Allison and Caterpillar automatic transmissions (10-bolt aperture)
• Lubrication Options: Pressure Lube (P) or Wet Spline (W)
• Continuous Operation: Yes

Additional Information

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