The Chelsea 281 Series Power Take-Off, part number 281GBKVP-B5RK or 281GBKVPB5RK, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. It mounts via a 10-bolt pattern and offers nine speed ratios covering both low and high ranges. The 281 Series is an evolution of the 280 Series, incorporating a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap, and an 80% thicker clutch pack disc to resist premature tooth wear. Rotatable cast-iron flanges reduce interference fit issues, and a wet spline lubrication option extends shaft life by 7 to 10 times. Common markets include fire and rescue, truck cranes, refuse, and pumper-cleaner trucks. Call us to confirm proper fit for your transmission and application.
Features
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration 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 including low and high speeds
Wet spline lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) and SmartStart reduce shock load and protect driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) - Hot Shift
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1,000 RPM
- Speed Ratios: Nine, including low and high
- Lubrication: Pressure lube or wet spline option
- Compatible Transmission Aperture: 10-Bolt (Allison, Caterpillar automatic transmissions)
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
