Chelsea part number 281GDFJP-B5RZ or 281GDFJPB5RZ is a 281 Series Power Take-Off Assembly built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. It uses hydraulic PowerShift engagement, supports continuous-duty operation, and offers nine speed ratios covering low and high ranges. The 281 Series improves on the earlier 280 Series with a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between housing and bearing cap, and an 80% thicker clutch pack steel disc to resist premature tooth wear. Wet Spline Lubrication extends shaft life 7 to 10 times compared to standard configurations. Rotatable cast-iron flanges reduce interference clearance issues, and a positive stop on driveline outputs eliminates oil seal damage from coupling. Available with SmartStart for reduced shock at engagement and Electronic Overspeed Control (EOC) for driven-equipment protection. Sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
10-bolt mounting for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot shift) engagement supports continuous-duty operation
Nine speed ratios including low and high-speed options
Ductile iron bearing cap, 117% stronger than gray iron predecessor
80% thicker steel discs in the clutch pack to resist premature tooth wear
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment
SmartStart reduces shock load at engagement for applicable configurations
Rotatable cast-iron flanges reduce pump clearance interference
Tech Specs
- Mounting: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot shift)
- Continuous Operation: Yes
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Speed Ratios: Nine ratios, including low and high speeds
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Lubrication: Pressure lube (P) or Wet Spline (W) option
- Series: Chelsea 281 Series (evolution of the 280 Series)
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
