The Chelsea 281GMFJP-B3RF or 281GMFJPB3RF is a 281 Series hydraulically shifted (PowerShift) Power Take-Off built for 10-bolt automatic transmissions, including Allison applications. This series carries a continuous torque rating of 390 lb-ft and supports nine speed ratios covering both low and high ranges. Output options across the 281 Series include SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. A ductile iron bearing cap delivers 117% greater strength over gray iron, and an O-ring sealing configuration between the housing and bearing cap improves clamp load while reducing vibrational stress. The clutch pack uses steel discs that are 80% thicker than the predecessor 280 Series design. Electronic Overspeed Control (EOC) and SmartStart are available to protect downstream equipment. A genuine Chelsea part, sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
10-Bolt hydraulic PowerShift design, compatible with Allison automatic transmissions
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibration
80% thicker steel discs in the clutch pack versus the predecessor 280 Series
Nine speed ratios including low and high speeds; continuous torque rating of 390 lb-ft
Wet spline lubrication option extends shaft life 7 to 10 times; SmartStart reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Compatible Transmission Manufacturer: Allison
- Continuous Torque Rating (series): 390 lb-ft / 529 Nm
- Speed Ratios: Nine (includes low and high)
- Continuous Operation: Yes
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube (P) or Wet Spline (W) option
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
