The Chelsea 281GDFJP-B3AC is a 281 Series Power Take-Off built for automatic transmissions with a 10-bolt aperture, including Allison applications. It uses hydraulic PowerShift engagement for hot shifting under load, and is rated for continuous operation. The 281 Series features a ductile iron bearing cap that is 117% stronger than the gray iron used in earlier designs, an o-ring sealing configuration between the housing and bearing cap, and an 80% thicker steel clutch disc pack to resist premature wear. Output options in the 281 family include SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. The series carries a continuous torque characteristic of 390 lb-ft and spans nine speed ratios.
Features
Hydraulic PowerShift (hot shift) engagement for use with Allison 10-bolt automatic transmissions
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
O-ring sealing between housing and bearing cap for improved clamp load
80% thicker steel discs in the clutch pack to reduce premature tooth wear
Continuous duty rated with a 390 lb-ft series continuous torque characteristic
Nine available speed ratios including low and high speed options
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) - Hot Shift
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm) - check application pages for actual rating
- Output Power (series): 37 HP at 500 RPM / 74 HP at 1000 RPM
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: 3/4"-11T Pump Spline, SAE B 7/8"-13T, SAE C 1-1/4"-14T, Smart Start Round Shaft (1-1/4" - 5/16" Key)
- Lubrication: Pressure Lube / Wet Spline options
- Speed Ratios: Nine ratios (includes low and high speed)
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO, engineered to handle the vibrational demands of modern engine designs. Markets served include fire and rescue, truck cranes, pumper cleaner, and refuse vehicles. The Electronic Overspeed Control (EOC) option protects driven equipment from overspeed damage. A SmartStart option reduces shock load at engagement for applicable configurations. Rotatable cast iron flanges allow pump clearance adjustment. The wet spline lubrication option extends shaft service life by 7 to 10 times compared to dry configurations. Refer to Parker Chelsea documents 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for detailed application and installation information.Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
