The Chelsea 281GSFJP-B3RK or 281GSFJPB3RK is a 281 Series hydraulically shifted hot-shift power take-off designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. The 281 Series is an evolution of the 280 Series, carrying over several design upgrades: a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap to improve clamp load, and clutch pack steel discs increased 80% in thickness to resist premature tooth wear. Nine speed ratios cover both low and high speeds. SmartStart reduces shock load at engagement, and the Electronic Overspeed Control (EOC) option protects driven equipment. The wet spline lubrication option extends shaft life seven to ten times over a standard spline. Rotatable cast iron flanges reduce interference issues at the pump. Pro Gear and Transmission sells this genuine Chelsea part. Call us to confirm proper fit for your transmission and application.
Features
Hydraulic hot-shift (PowerShift) operation for use with automatic transmissions
10-bolt mounting aperture, compatible with Allison transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap improves clamp load and resists vibration
Clutch pack steel discs 80% thicker 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
SmartStart reduces shock load at engagement; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting: 10-Bolt
- Shift Type: Hydraulic (PowerShift / Hot Shift)
- Compatible Transmission: Allison automatic transmissions
- Continuous Torque (Series Rating): 390 lb-ft (529 Nm)
- Continuous Operation: Yes
- Speed Ratios: Nine, including low and high
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube or Wet Spline option
- Shaft Power (Series): 37 HP at 500 RPM, 74 HP at 1,000 RPM
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
