281GMFJP-E5XD Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off Assembly, part number 281GMFJP-E5XD or 281GMFJPE5XD, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. The 281 Series is an evolution of the Chelsea 280 Series, incorporating a ductile iron bearing cap that is 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap to improve clamp load, and an 80% increase in clutch pack steel disc thickness to resist premature tooth wear. Nine speed ratios cover both low and high ranges. Rotatable cast-iron flanges reduce interference clearance issues, and a Positive Stop feature on driveline outputs eliminates oil seal damage from coupling. Wet Spline Lubrication option provides 7 to 10 times greater shaft life. Common markets include fire and rescue, refuse, truck cranes, and pumper-cleaner equipment. Call us to confirm proper fit for your specific transmission and application.

Features

Ductile iron bearing cap - 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios including low and high-speed options
Rotatable cast-iron flanges reduce pump clearance interference
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Positive Stop for driveline outputs eliminates oil seal damage from coupling
SmartStart reduces shock load at start-up for applicable applications
Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic) - Hot Shift
• Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
• Continuous Operation: Yes
• Continuous Torque (Series): 390 lb-ft (529 Nm) - check application pages for actual torque rating
• Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Nine Speed Ratios: Low and high speeds included
• Lubricant Options: Pressure Lube (P), Wet Spline (W)
• Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM (28 kW at 500 RPM / 55 kW at 1000 RPM)
• 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.