The Chelsea 281 Series Power Take-Off, part number 281GGFJW-G8RY or 281GGFJWG8RY, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison transmissions. This unit carries a gear ratio of 31/41 and mounts to the 10-bolt aperture found on those platforms. The 281 Series is an evolution of Chelsea's 280 Series, adding a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between housing and bearing cap for improved clamp load, and an 80% thicker steel clutch pack to resist premature tooth wear. Nine speed ratios cover both low- and high-speed applications. Output options across the series include SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline outputs. Call us to confirm proper fit for your transmission and application.
Features
Hydraulic PowerShift (hot-shift) operation for engagement under load on automatic transmissions
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 for resistance to premature tooth wear
Wet Spline Lubrication option extends shaft life 7 to 10 times over standard configurations
Nine speed ratios including low and high speeds; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Gear Ratio: 31/41
- Compatible Transmissions: Allison automatic (10-bolt aperture)
- Continuous Operation: Yes
- Output Types (series): SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube or Wet Spline options
- SmartStart: Available for shock-load reduction at start-up
- Electronic Overspeed Control (EOC): Included
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
