281GDFJP-G5RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GDFJP-G5RK or 281GDFJPG5RK, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. It mounts via a 10-bolt pattern and carries a single continuous duty torque rating across nine speed ratios, including both low and high speeds. The ductile iron bearing cap is 117% stronger than gray iron, and an O-ring sealing configuration between the housing and bearing cap improves clamp load while reducing vibrational effects. The clutch pack features steel discs that are 80% thicker than the predecessor 280 Series design. Rotatable cast-iron flanges help clear pump interference. A wet spline lubrication option extends shaft life 7 to 10 times over a standard configuration. SmartStart reduces shock load at start-up, and Electronic Overspeed Control (EOC) protects driven equipment. Applications span fire and rescue, refuse, truck cranes, and pumper cleaner equipment. Call us to confirm proper fit for your application.

Features

Chelsea 281 Series hot-shift PTO, 10-bolt mounting for Allison automatic transmissions
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with steel discs 80% thicker than 280 Series predecessor
Nine speed ratios including low and high speeds; single continuous duty torque rating
Wet spline lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces start-up shock load; Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast-iron flanges reduce pump clearance interference; positive stop for driveline outputs eliminates oil seal damage

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic (Hot Shift / PowerShift)
• Compatible Transmission: Allison automatic transmissions (10-bolt aperture)
• Continuous Torque Rating (Series): 390 lb-ft (529 Nm)
• Speed Ratios: Nine, including low and high
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubrication Option: Wet Spline (W) or Pressure Lube (P)
• Continuous Operation: Yes
• Output Shaft Options: SAE B (7/8 in. - 13T) Pump Spline, SAE C (1-1/4 in. - 14T) Pump Spline, 1-1/4 in. Round Shaft with 5/16 in. Key (SmartStart), 3/4 in. - 11T Pump Spline, 1410 Companion Flange
• Typical Markets: Fire and Rescue, Refuse, Truck Cranes, Pumper Cleaner

Additional Information

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