Features
Hydraulic (PowerShift) hot-shift operation for Allison 10-bolt automatic transmissions
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Steel clutch-pack discs 80% thicker than previous design to resist premature tooth wear
Nine speed ratios available including low and high speeds
Wet spline lubrication option provides 7 to 10 times greater output shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast-iron flanges reduce pump clearance interference; positive stop for driveline outputs eliminates oil seal damage
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic (PowerShift) Hot Shift
- Continuous Operation: Yes
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Speed Ratios: Nine, including low and high
- Wet Spline Lubrication Option: Yes
- SmartStart: Available for certain applications
- Electronic Overspeed Control (EOC): Yes
- Applicable Markets: Fire and rescue, refuse, truck cranes, pumper-cleaner
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series PTO, engineered to address the increased vibrational demands of modern engine designs. Relevant Parker Chelsea documents for this series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. The part number 281GKFJW-B5RZ is also referenced as SP281GKFJW-B5RZ in some catalog listings.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
