The Chelsea 281 Series Power Take-Off, part number 281GGFJP-K8RK or 281GGFJPK8RK, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. An evolution of the 280 Series, the 281 introduces a ductile iron bearing cap that is 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap to improve clamp load, and an 80% thicker clutch pack to resist premature tooth wear. Nine speed ratios cover both low and high ranges. Rotatable cast-iron flanges reduce pump clearance interference, and a positive-stop design on driveline outputs eliminates oil seal damage from coupling. Electronic Overspeed Control (EOC) protects driven equipment, and the SmartStart feature reduces shock load at start-up where applicable. A genuine Chelsea part available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 281 Series is an evolution of the 280 Series PTO platform, carrying forward its broad transmission compatibility while adding structural and sealing improvements aimed at durability in high-vibration engine environments. Relevant Parker Chelsea reference documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Part number 281GGFJP-K8RK is also referenced as SP281GGFJP-K8RK in some catalog listings.
Features
Chelsea 281 Series hydraulic hot-shift PTO for 10-bolt automatic transmissions (Allison, Caterpillar)
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring seal between housing and bearing cap improves clamp load and resists vibration
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios including low and high speeds
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Wet spline lubrication option provides 7 to 10 times greater shaft life; hose included
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Continuous Operation: Yes
- Compatible Transmissions: Allison automatic transmissions (10-bolt aperture)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: SmartStart round shaft (1-1/4" - 5/16" key), 3/4" - 11T pump spline, SAE B (7/8" - 13T) pump spline, SAE C (1-1/4" - 14T) pump spline, DIN 5462 pump spline, 1410 companion flange, DIN 120 flange, DIN 100 flange
- Lubricant Options: Pressure lube (P), Wet spline (W)
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual torque on application page
- Series Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM (28 kW at 500 RPM, 55 kW at 1000 RPM)
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series PTO platform, carrying forward its broad transmission compatibility while adding structural and sealing improvements aimed at durability in high-vibration engine environments. Relevant Parker Chelsea reference documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Part number 281GGFJP-K8RK is also referenced as SP281GGFJP-K8RK in some catalog listings.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
