281GDFJP-G8RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GDFJP-G8RK or 281GDFJPG8RK, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison and Caterpillar transmissions. Built as an evolution of the 280 Series, the 281 Series introduces 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 an enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear. Nine speed ratios span low through high ranges. Rotatable cast iron flanges reduce interference fitment issues at the pump flange. The series carries a single, continuous duty torque rating and supports output options including SAE B and SAE C pump flanges, ISO 7652 flanges, and driveline outputs. A genuine Chelsea part sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission mounting, compatible with Allison and Caterpillar transmissions
Ductile iron bearing cap rated 117% stronger than gray iron compared to the predecessor 280 Series
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
Nine speed ratios including dedicated low and high speed ranges
Wet Spline Lubrication option provides 7 to 10 times greater output shaft service life
SmartStart feature reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast iron flanges reduce pump clearance interference; Positive Stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic PowerShift (Hot-Shift)
• Compatible Transmissions: Allison and Caterpillar automatic transmissions
• Continuous Torque (Series Rating): 390 lb-ft (529 Nm)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Speed Ratios: Nine (includes low and high)
• Lubrication: Pressure Lube (P) or Wet Spline (W) options
• 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.