The Chelsea 281 Series Power Take-Off Assembly, part number 281GMFJW-B5RZ or 281GMFJWB5RZ, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. An evolution of the proven 280 Series, the 281 features a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap to improve clamp load, and 80% thicker steel discs in the clutch pack to resist premature tooth wear. Nine speed ratios cover both low and high ranges, and rotatable cast-iron flanges reduce interference with pump clearance. Applications span fire and rescue, truck cranes, pumper-cleaner, and refuse vehicles. Call us to confirm proper fit for your application.
Features
Hydraulic PowerShift (hot-shift) operation for use with automatic transmissions
10-bolt mounting aperture, compatible with Allison and Caterpillar transmissions
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibration
80% thicker steel discs in clutch pack to resist premature tooth wear
Nine speed ratios including low and high speeds; Wet Spline Lubrication option extends shaft life 7 to 10 times
SmartStart feature reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Compatible Transmissions: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Speed Ratios: Nine (includes low and high speeds)
- Continuous Torque Rating: 390 lb-ft (series rating; verify actual rating on application pages)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube or Wet Spline options
- Markets: Fire and Rescue, Truck Cranes, Pumper-Cleaner, Refuse
Additional Information
Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices
