The Chelsea 281GGFJP-G5RK or 281GGFJPG5RK is a hydraulically shifted, hot-shift Power Take-Off from Chelsea's 281 Series, designed for automatic transmissions with a 10-bolt aperture including Allison applications. It carries a single continuous duty torque rating of 390 lb-ft (529 Nm) and delivers up to 74 HP at 1000 RPM. Nine speed ratios cover both low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, the clutch pack uses steel discs 80% thicker than the predecessor 280 Series, and an o-ring sealing configuration between the housing and bearing cap improves clamp load. This unit also cross-references to predecessor part numbers 280GGFJP-G5RK or 280GGFJPG5RK. A genuine Chelsea part from Pro Gear and Transmission - call us to confirm proper fit for your application.
The Chelsea 281 Series is an evolution of the top-selling 280 Series PTO, engineered to address the vibrational demands of modern and future engine designs. Typical markets served include fire and rescue, truck cranes, pumper-cleaner vehicles, and refuse trucks. SmartStart reduces shock load at start-up for compatible applications, and the positive stop for driveline outputs eliminates oil seal damage from coupling contact. Rotatable cast-iron flanges reduce interference issues with pumps and driven equipment.
Features
Chelsea 281 Series hydraulic hot-shift PTO for 10-bolt Allison transmission apertures
Ductile iron bearing cap rated 117% stronger than gray iron
Enhanced clutch pack with steel discs 80% thicker than the 280 Series predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibrational effects
Nine speed ratios including low and high ranges; continuous torque rating of 390 lb-ft (529 Nm)
Wet Spline Lubrication option provides 7 to 10 times greater shaft life; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt aperture (Allison automatic transmissions)
- Shift Type: PowerShift (Hydraulic hot-shift)
- Continuous Torque: 390 lb-ft (529 Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM
- Speed Ratios: Nine ratios 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
- Cross-Reference: 280GGFJP-G5RK or 280GGFJPG5RK
Additional Information
The Chelsea 281 Series is an evolution of the top-selling 280 Series PTO, engineered to address the vibrational demands of modern and future engine designs. Typical markets served include fire and rescue, truck cranes, pumper-cleaner vehicles, and refuse trucks. SmartStart reduces shock load at start-up for compatible applications, and the positive stop for driveline outputs eliminates oil seal damage from coupling contact. Rotatable cast-iron flanges reduce interference issues with pumps and driven equipment.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
