Features
Hydraulic PowerShift operation, designed for 10-bolt aperture automatic transmissions including Allison
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibrational effects
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios including low and high speeds
Wet spline lubrication option extends shaft life 7 to 10 times
Positive stop for driveline outputs eliminates oil seal damage from coupling
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt aperture
- Shift Type: PowerShift (Hydraulic)
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Intermittent Torque: 301 to 400 lb-ft range
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Output Shaft Options: SmartStart round shaft (1-1/4" - 5/16" key), 3/4" 11-tooth pump spline, SAE B 7/8" 13-tooth pump spline, SAE C 1-1/4" 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, DIN 120 flange, DIN 100 flange
- Lubrication: Pressure lube or wet spline options
- Continuous Operation: Yes
- Typical Markets: Fire and rescue, truck cranes, pumper cleaner, refuse
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
