The Chelsea 281GTFJW-G5RY is a 281 Series Power Take-Off built for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. The 281 Series uses hydraulic (PowerShift) engagement, making it a hot-shift PTO suited for continuous-duty operation. The series carries a continuous torque rating of 390 lb-ft and delivers 74 HP at 1,000 RPM. Nine speed ratios are available across the series, spanning low- and high-speed configurations. The 281 Series is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than the gray iron predecessor, an o-ring seal between the housing and bearing cap for improved clamp load, and clutch pack steel discs increased 80% in thickness to resist premature wear. Typical markets include fire and rescue, truck cranes, pumper cleaners, and refuse trucks. Sold by Pro Gear and Transmission.
Features
10-bolt mounting aperture for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) engagement for continuous-duty operation
390 lb-ft continuous torque rating; 74 HP output at 1,000 RPM
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Cltuch pack steel discs increased 80% in thickness to reduce premature tooth wear
O-ring sealing between housing and bearing cap for improved clamp load
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Continuous Operation: Yes
- Continuous Torque: 390 lb-ft (529 Nm)
- Output Power: 74 HP at 1,000 RPM; 37 HP at 500 RPM
- Transmission Compatibility: Allison and Caterpillar automatic transmissions (10-bolt aperture)
- Bearing Cap Material: Ductile Iron
- Speed Ratios: Nine ratios available (low- and high-speed)
- Output Types Available (series): SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
Additional Information
The 281 Series is the direct evolution of Chelsea's top-selling 280 Series PTO. Key structural improvements include a ductile iron bearing cap (117% stronger than the gray iron cap used on the 280 Series), an o-ring sealing configuration between the housing and bearing cap, and clutch pack steel discs that are 80% thicker than those in the predecessor unit. These changes are specifically aimed at reducing vibration damage associated with modern engine designs. Optional wet spline lubrication extends shaft life 7 to 10 times compared to standard lubrication. The SmartStart feature reduces shock load at engagement for applicable configurations, and Electronic Overspeed Control (EOC) is available to protect driven equipment. Applicable markets include fire and rescue, truck cranes, pumper cleaner, and refuse vehicle applications. Relevant Parker Chelsea reference 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.
