The Chelsea 281GPFJP-B3SV is a 281 Series PowerShift (hydraulic) hot-shift power take-off built for automatic transmissions with a 10-bolt aperture, including Allison applications. The 281 Series is rated for continuous-duty operation, with a series continuous torque characteristic of 390 lb-ft and output options spanning SAE B and SAE C pump flanges and driveline configurations. The bearing cap is ductile iron, 117% stronger than gray iron, and the clutch pack uses steel discs that are 80% thicker than the predecessor 280 Series design. An o-ring sealing configuration between the housing and bearing cap improves clamp load and resists vibration. Common markets include fire and rescue, refuse, truck cranes, and pumper-cleaner trucks. Available from Pro Gear and Transmission.
Features
281 Series PowerShift (hydraulic) hot-shift operation for continuous-duty use
10-bolt aperture mounting for Allison and Caterpillar automatic transmissions
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
Enhanced clutch pack with steel discs 80% thicker than 280 Series design
O-ring sealing between housing and bearing cap for improved clamp load
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: 390 lb-ft (529 Nm) - check application pages for actual torque rating
- Output Power (Series): 74 HP at 1,000 RPM / 37 HP at 500 RPM
- Compatible Transmission: Allison automatic (10-bolt aperture)
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube / Wet Spline option
- Markets: Fire and Rescue, Refuse, Truck Cranes, Pumper-Cleaner
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO, carrying over the same 10-bolt mounting pattern while introducing a ductile iron bearing cap, an upgraded o-ring seal interface, and an 80% thicker steel disc clutch pack. Nine speed ratios are available across the series, including both low- and high-speed options. The SmartStart feature is available to reduce shock load at start-up on applicable configurations, and wet spline lubrication can extend shaft service life by 7 to 10 times compared to dry-spline operation. The Electronic Overspeed Control (EOC) option protects driven hydraulic equipment from damaging overspeed events. Relevant Parker Chelsea documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
