The Chelsea 281 Series Power Take-Off, part number 281GSFJW-B8RF or 281GSFJWB8RF, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. The 281 Series builds on the proven 280 Series platform with a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap for improved clamp load, and an 80% increase in clutch pack steel disc thickness to resist premature tooth wear. Rotatable cast-iron flanges reduce interference fit issues, and a positive stop on driveline outputs eliminates oil seal damage from coupling contact. The wet spline lubrication option extends shaft life by 7 to 10 times. Nine speed ratios cover both low and high speed needs. SmartStart reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment. Common markets include fire and rescue, refuse, truck cranes, and pumper cleaner applications. Call us to confirm proper fit for your transmission and application.
Features
10-bolt mounting aperture for Allison and Caterpillar automatic transmissions
PowerShift hydraulic shift for hot-shift operation under load
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 resist premature tooth wear
Nine speed ratios including low and high speeds
Wet spline lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting: 10-Bolt aperture
- Shift Type: PowerShift (Hydraulic) hot-shift
- Compatible Transmissions: Allison automatic
- Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Intermittent Torque Range: 301-400 lb-ft (501+ Nm)
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Speed Ratios: Nine, including low and high
- Lubrication: Pressure lube or wet spline options
- Series: Chelsea 281
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
