The Chelsea 281 Series Power Take-Off, part number 281GGFJW-G5RK or 281GGFJWG5RK, is a hydraulically shifted (PowerShift) hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, most commonly Allison and Caterpillar transmissions. It carries a continuous torque rating of 390 lb-ft and delivers output options that include SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, and driveline configurations. The 281 Series is an evolution of the 280 Series, featuring a ductile iron bearing cap 117% stronger than gray iron, an enhanced clutch pack with 80% thicker steel discs, and nine available speed ratios spanning low and high ranges. Common markets include fire and rescue, truck cranes, refuse, and pumper cleaner equipment. Call us to confirm proper fit for your specific transmission and application.
Features
Ductile Iron Bearing Cap: 117% stronger than gray iron for improved durability
Enhanced Clutch Pack: steel discs are 80% thicker to resist premature tooth wear
Improved Seal: O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Nine Speed Ratios: includes both low and high speed options
Positive Stop for Driveline Outputs: eliminates oil seal damage from coupling
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up for compatible applications
Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) Hot Shift
- Compatible Transmissions: Allison automatic transmissions (10-bolt aperture)
- Continuous Torque Rating: 390 lb-ft (529 Nm)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: SAE B (7/8 in. - 13T) Pump Spline, SAE C (1-1/4 in. - 14T) Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange, SmartStart Round Shaft (1-1/4 in. - 5/16 in. Key), 3/4 in. - 11T Pump Spline
- Lubrication Options: Pressure Lube, Wet Spline
- Continuous Operation: Yes
- NMFC Code: 125820 (Hydraulic PTOs, Pumps, Motors)
Additional Information
Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices
