The Chelsea 281GMFJP-D8XV is a 281 Series hydraulically shifted PowerShift PTO built for automatic transmissions with a 10-bolt aperture, including Allison applications. The 281 Series operates on continuous duty and carries a series continuous torque rating of 390 lb-ft. The ductile iron bearing cap is 117% stronger than the gray iron cap used in the predecessor 280 Series, and the clutch pack features steel discs that are 80% thicker to resist premature tooth wear. An o-ring sealing configuration between the housing and bearing cap improves clamp load and helps counter vibrational effects from modern engine designs. Output options across the series include SAE B and SAE C pump flanges, ISO 7652, and driveline configurations. The 281 Series also supports an Electronic Overspeed Control option and a SmartStart feature for shock-load reduction at startup.
Features
281 Series hydraulic PowerShift (hot-shift) PTO for 10-bolt automatic transmission apertures
Compatible with Allison and Caterpillar transmission applications
Ductile iron bearing cap, 117% stronger than the gray iron cap in the predecessor 280 Series
Clutch pack steel discs increased 80% in thickness for improved wear resistance
O-ring seal between housing and bearing cap for better clamp load and vibration resistance
Electronic Overspeed Control and SmartStart options available across the series
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm)
- Series Output Power: 51+ kW / 56+ HP
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1,000 RPM
- Output Shaft Options: 1-1/4" round (5/16" key), 3/4"-11T pump spline, SAE B 7/8"-13T pump spline, SAE C 1-1/4"-14T pump spline, 1410 companion flange
- Lubrication: Pressure lube or wet spline options
- Transmission Compatibility: Allison (10-bolt aperture)
Additional Information
The 281 Series is Chelsea's evolution of the 280 Series PTO, incorporating three core structural upgrades: a ductile iron bearing cap, a revised o-ring housing seal, and a heavier clutch pack. Nine speed ratios are available across the series, covering both low- and high-speed applications. Typical market applications for the 281 Series include fire and rescue apparatus, truck cranes, pumper-cleaner units, and refuse vehicles. The SmartStart feature reduces shock load at engagement for select applications, and the wet spline lubrication option extends shaft service life significantly compared to standard configurations. Relevant Chelsea documentation includes 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.
