The Chelsea 281 Series Power Take-Off, part number 281GDFJW-S8RK or 281GDFJWS8RK, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison transmissions. It builds on the proven 280 Series platform with a ductile iron bearing cap rated 117% stronger than gray iron and an 80% thicker clutch pack to resist premature tooth wear. An o-ring sealing configuration between the housing and bearing cap improves clamp load and reduces vibrational effects from modern engine designs. Rotatable cast-iron flanges reduce pump clearance interference, and the wet spline lubrication option extends shaft life by 7 to 10 times. Nine speed ratios covering both low and high ranges, plus Electronic Overspeed Control (EOC) and SmartStart shock-load reduction, make this unit well suited for fire and rescue, refuse, truck crane, and pumper cleaner applications. Call us to confirm proper fit for your transmission.
Features
Hydraulic hot-shift (PowerShift) operation for use on automatic transmissions with a 10-bolt aperture
Ductile iron bearing cap, 117% stronger than gray iron, with o-ring sealing configuration for improved clamp load
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios including low and high speeds; single continuous-duty torque rating
Wet spline lubrication option extends shaft life 7 to 10 times compared to standard
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison automatic transmissions
- Speed Ratios: Nine (including low and high speeds)
- Continuous Torque (Series): 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Options: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Lubrication: Pressure lube or wet spline options
- Continuous Operation: Yes
Additional Information
Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices
