The Chelsea 281GSFJP-N5AC is a 281 Series PowerShift (hydraulic) hot-shift power take-off built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. The 281 Series mounts via a 10-bolt flange and is rated for continuous operation at up to 390 lb-ft of continuous torque. The series features a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap, and an 80% thicker clutch pack steel disc stack to resist premature wear. Output options across the 281 Series include SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. A genuine Chelsea part, available from Pro Gear and Transmission.
Features
281 Series PowerShift (hydraulic) hot-shift PTO
10-bolt mounting for Allison and Caterpillar automatic transmissions
Continuous-duty rated up to 390 lb-ft torque
Ductile iron bearing cap, 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 resist premature tooth wear
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) Hot Shift
- Continuous Torque: 390 lb-ft (529 Nm)
- Continuous Operation: Yes
- Transmission Compatibility: Allison, Caterpillar (10-bolt aperture)
- Output Options: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube / Wet Spline options available
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO, carrying over the proven 10-bolt hot-shift design with targeted structural upgrades. Nine speed ratios are available across the series, including low- and high-speed configurations. The series supports a SmartStart option to reduce shock load at engagement, and Electronic Overspeed Control (EOC) for equipment protection. Common markets include fire and rescue, truck cranes, pumper/cleaner trucks, and refuse vehicles. Parker Chelsea reference documents: 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.
