Description
The Chelsea 281GMFJW-G8RK or 281GMFJWG8RK is a 281 Series hydraulically shifted hot-shift power take-off built for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. As an evolution of the 280 Series, the 281 Series introduces 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 ranges. Rotatable cast-iron flanges reduce interference issues, and the wet spline lubrication option extends shaft life by 7 to 10 times. Electronic Overspeed Control (EOC) and the SmartStart feature are included for added drivetrain protection. Call us to confirm proper fit for your application.
Features
Ductile iron bearing cap, 117% stronger than gray iron compared to the 280 Series predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibration
Enhanced clutch pack with steel discs 80% thicker than previous design to resist premature tooth wear
Nine speed ratios covering both low and high ranges
Wet spline lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) and SmartStart to protect driven equipment and reduce start-up shock load
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) – verify actual rating on application pages
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Available Output Shafts: SmartStart 1-1/4″ round, 3/4″-11T pump spline, SAE B 7/8″-13T, SAE C 1-1/4″-14T, DIN 5462 spline, 1410 companion flange, DIN 120 flange, DIN 100 flange
- Series Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Speed Ratios: Nine (including low and high)
- Lubrication Option: Wet Spline (W) or Pressure Lube (P)
- Typical Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
Parker Chelsea documents for the 281 Series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner’s Manual. The 281 Series is an upgrade to the 280 Series PTO line, incorporating structural and sealing improvements focused on reducing vibration-related damage associated with current and future engine designs.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
