The Chelsea 281 Series Power Take-Off, part number 281GPFJP-D5RK or 281GPFJPD5RK, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. The 281 Series is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron and an O-ring sealing configuration between the housing and bearing cap to improve clamp load and resist vibration from modern engine designs. The clutch pack uses steel discs 80% thicker than the previous design to resist premature tooth wear. Nine speed ratios cover both low and high speed applications. Rotatable cast iron flanges reduce interference issues at the pump, and a positive stop on driveline outputs eliminates oil seal damage from coupling contact. The wet spline lubrication option extends shaft life 7 to 10 times over a dry configuration. SmartStart reduces shock load at engagement, and Electronic Overspeed Control (EOC) protects driven equipment. Common markets include fire and rescue, truck cranes, pumper-cleaner, and refuse trucks. Call us to confirm proper fit for your specific transmission and application.
Features
Hydraulic PowerShift (hot-shift) operation for Allison and Caterpillar 10-bolt automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap improves clamp load and resists vibration
Clutch pack steel discs 80% thicker than previous 280 Series design
Nine speed ratios available, covering both low and high speed ranges
Wet spline lubrication option provides 7 to 10 times greater output shaft life
SmartStart reduces engagement shock load; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Continuous Operation: Yes
- Compatible Transmissions: Allison and Caterpillar (10-bolt aperture)
- Speed Ratios: Nine ratios, including low and high speeds
- Bearing Cap Material: Ductile Iron
- Seal Type: O-ring configuration between housing and bearing cap
- Lubrication Option: Wet Spline (W) or Pressure Lube (P)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Electronic Overspeed Control (EOC): Yes
- SmartStart: Available for certain applications
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
