281GMFJP-B5SD Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off Assembly, part number 281GMFJP-B5SD or 281GMFJPB5SD, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly used on Allison transmissions. It carries a single continuous-duty torque rating and offers nine speed ratios covering both low and high ranges. 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 the effects of engine vibration. The clutch pack features steel discs that are 80% thicker than those in the predecessor 280 Series. A cross-reference to the prior generation part number 280GMFJP-B5SD or 280GMFJPB5SD is available for identification. Call us to confirm proper fit for your application.

Features

Hydraulic (PowerShift) hot-shift operation; designed for 10-bolt automatic transmission apertures including Allison
Ductile iron bearing cap - 117% stronger than gray iron for increased durability
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibration effects
Enhanced clutch pack with steel discs 80% thicker than the 280 Series predecessor
Nine speed ratios available, including low and high speed ranges
Wet Spline Lubrication option provides 7 to 10 times greater shaft life; Positive Stop for driveline outputs eliminates oil seal damage
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting: 10-Bolt aperture (Allison automatic transmissions)
• Shift Type: Hydraulic PowerShift (hot-shift)
• Continuous Duty: Yes - single continuous-duty torque rating
• Series Continuous Torque: 390 lb-ft (529 Nm) - check application pages for actual rating
• Speed Ratios: Nine, including low and high
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubrication: Pressure Lube or Wet Spline option
• Series Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM (28 kW / 55 kW)
• Cross Reference: 280GMFJP-B5SD or 280GMFJPB5SD (prior generation)
• Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse

Additional Information

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