The Chelsea 281 Series Power Take-Off Assembly, part number 281GTFJP-G8RK or 281GTFJPG8RK, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly used on Allison and Caterpillar transmissions. It is an evolution of the 280 Series, with a ductile iron bearing cap rated 117% stronger than gray iron, an 80% thicker clutch pack steel disc for reduced tooth wear, and an O-ring sealing configuration between the housing and bearing cap to improve clamp load. Nine speed ratios cover both low and high ranges, and the Wet Spline Lubrication option extends shaft life by 7 to 10 times over a standard dry spline setup. Applications include fire and rescue, truck cranes, pumper cleaners, and refuse trucks. Call us to confirm proper fit for your specific transmission and application.
The Chelsea 281 Series is suited for demanding continuous-duty markets including fire and rescue apparatus, truck cranes, pumper cleaner trucks, and refuse vehicles. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. The included hose eliminates a separate order step. For reference, Parker Chelsea publishes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for detailed service and parts information.
Features
Ductile Iron Bearing Cap - 117% stronger than gray iron compared to the predecessor 280 Series
Enhanced Clutch Pack - steel discs are 80% thicker to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Nine speed ratios available, spanning low and high speed ranges
Wet Spline Lubrication option provides 7 to 10 times greater output shaft life
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at start-up for compatible applications
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Transmission Compatibility: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Intermittent Torque: 301 to 400 lb-ft (501+ Nm)
- 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)
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Types Available: SmartStart Round Shaft (1-1/4" - 5/16" Key), 3/4" 11-tooth Pump Spline, SAE B 7/8" 13-tooth Pump Spline, SAE C 1-1/4" 14-tooth Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange
- Lubrication: Pressure Lube or Wet Spline options
- Speed Ratios: Nine (including low and high)
- Series: Chelsea 281 (evolution of 280 Series)
- Part Number: 281GTFJP-G8RK or 281GTFJPG8RK
Additional Information
The Chelsea 281 Series is suited for demanding continuous-duty markets including fire and rescue apparatus, truck cranes, pumper cleaner trucks, and refuse vehicles. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. The included hose eliminates a separate order step. For reference, Parker Chelsea publishes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for detailed service and parts information.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
