The Chelsea 281GDFJP-B8RY or 281GDFJPB8RY is a hydraulically shifted (PowerShift) hot-shift power take-off from the 281 Series, designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. It is an evolution of the 280 Series, with 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 an 80% increase in clutch pack steel disc thickness to resist premature tooth wear. Nine speed ratios cover both low and high ranges. Rotatable cast iron flanges reduce interference with pump clearance, and the Positive Stop feature on driveline outputs eliminates oil seal damage from coupling. Call us to confirm proper fit for your application.
The Chelsea 281 Series is suited for demanding vocational applications including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Parker documents for this series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, which cover parts identification, installation, and service procedures.
Features
10-Bolt mounting aperture, compatible with Allison automatic transmissions
Hydraulic PowerShift (hot-shift) operation for engagement under load
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration 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
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Continuous Operation: Yes
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - check application pages for actual rating
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: SmartStart Round Shaft (1-1/4 in. with 5/16 in. key), 3/4 in. 11-tooth pump spline, SAE B 7/8 in. 13-tooth pump spline, SAE C 1-1/4 in. 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange
- Speed Ratios: Nine, including low and high
- Lubricant Options: Pressure Lube (P) or Wet Spline (W)
- Transmission Application: Allison (and Caterpillar) automatic transmissions, 10-bolt aperture
- Series Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
Additional Information
The Chelsea 281 Series is suited for demanding vocational applications including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Parker documents for this series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, which cover parts identification, installation, and service procedures.
Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices
