Features
Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmissions including Allison and Caterpillar
Ductile iron bearing cap rated 117% stronger than gray iron for increased durability
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios covering low and high speed ranges
Wet spline lubrication option provides 7 to 10 times greater output shaft life
Positive stop for driveline outputs eliminates oil seal damage from coupling
SmartStart feature reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic, hot-shift)
- Transmission Compatibility: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm) - check application pages for actual torque rating
- Series Intermittent Torque: 301 to 400 lb-ft (501+ Nm)
- Series Output Power: 56+ HP (51+ kW)
- Series Shaft Power: 37 HP at 500 RPM; 74 HP at 1000 RPM (28 kW at 500 RPM; 55 kW at 1000 RPM)
- Speed Ratios: Nine (includes low and high)
- Lubricant Options: Pressure Lube (P), Wet Spline (W)
- Output Types Available in Series: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Types Available in Series: SmartStart Round Shaft (1-1/4 in. - 5/16 in. Key), 3/4 in. 11T Pump Spline, SAE B 7/8 in. 13T Pump Spline, SAE C 1-1/4 in. 14T Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
