The Chelsea 281 Series Power Take-Off Assembly, part number 281GCFJW-B3RZ or 281GCFJWB3RZ, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. It is an evolution of the 280 Series, built with a ductile iron bearing cap rated 117% stronger than gray iron and an 80% thicker clutch pack steel disc stack to resist premature tooth wear. The o-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects associated with modern engine designs. Rotatable cast iron flanges reduce interference issues at the pump mount. The series carries a single, continuous duty torque rating. Call us to confirm proper fit and output configuration for your specific transmission and application.
The Chelsea 281 Series is suited for demanding markets including fire and rescue, refuse, pumper/cleaner, and truck crane applications. The Positive Stop for driveline outputs eliminates oil seal damage from coupling. Hose is included with applicable configurations. The series is documented under Parker parts list HY25-2281-M1/US and the 267/281/288/871/878 Series Owner's Manual. Also referenced as SP281GCFJW-B3RZ in some catalogs.
Features
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap improves clamp load and reduces vibrational effects
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios available, including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at start-up
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Application: Allison automatic transmissions
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Type: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, or Driveline
- Speed Ratios: Nine, including low and high
- Continuous Operation: Yes
- Lubrication: Wet Spline option available
Additional Information
The Chelsea 281 Series is suited for demanding markets including fire and rescue, refuse, pumper/cleaner, and truck crane applications. The Positive Stop for driveline outputs eliminates oil seal damage from coupling. Hose is included with applicable configurations. The series is documented under Parker parts list HY25-2281-M1/US and the 267/281/288/871/878 Series Owner's Manual. Also referenced as SP281GCFJW-B3RZ in some catalogs.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
