Features
Ductile Iron Bearing Cap - 117% stronger than gray iron for greater durability in high-vibration environments.
Enhanced Clutch Pack - Steel discs are 80% thicker than the predecessor 280 Series to resist premature tooth wear.
O-Ring Sealing Configuration - Improves clamp load between housing and bearing cap to reduce vibrational effects.
Nine Speed Ratios - Covers both low and high speed ranges for flexible application matching.
Wet Spline Lubrication Option - Provides 7 to 10 times greater output shaft life.
Electronic Overspeed Control (EOC) - Protects driven equipment from overspeed damage.
SmartStart - Reduces shock load at engagement for applicable configurations.
Rotatable Cast-Iron Flanges - Minimize pump clearance interference during installation.
Positive Stop for Driveline Outputs - Eliminates oil seal damage from coupling contact.
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Designed For: Automatic transmissions - Allison and Caterpillar
- Continuous Torque (Series): 390 lb-ft (529 Nm) - check application pages for actual torque rating
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine, including low and high ranges
- Continuous Operation: Yes
- Lubrication Options: Pressure Lube, Wet Spline
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
