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.
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.
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.
