The Chelsea 281GMFJW-G5RZ is a 281 Series hydraulically shifted PowerShift power take-off designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. The 281 Series features a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap for improved clamp load, and clutch pack steel discs that are 80% thicker than the predecessor 280 Series design. Series continuous torque rating is 390 lb-ft. Output options in the 281 Series include SAE B and SAE C pump flanges, ISO 7652, and driveline configurations. Available from Pro Gear and Transmission.
Features
10-bolt mounting for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot shift) engagement for continuous-duty operation
Ductile iron bearing cap, 117% stronger than the gray iron predecessor
O-ring seal between housing and bearing cap improves clamp load and vibration resistance
Clutch pack steel discs are 80% thicker than 280 Series for extended service life
Series continuous torque rating: 390 lb-ft (529 Nm)
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Continuous Operation: Yes
- Continuous Torque (Series Rating): 390 lb-ft (529 Nm)
- Output Power (Series): 74 HP at 1,000 RPM / 37 HP at 500 RPM
- Transmission Compatibility: Allison, Caterpillar (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
Additional Information
The 281 Series is an evolution of Chelsea's top-selling 280 Series PTO, incorporating three structural upgrades targeting durability under modern engine vibration profiles. The ductile iron bearing cap replaces the gray iron cap of the prior generation. The clutch pack disc thickness increase of 80% is designed to resist premature tooth wear under sustained high-cycle use. Electronic Overspeed Control (EOC) is available in the 281 Series to protect driven equipment. Typical markets served by this series include fire and rescue apparatus, truck cranes, pumper-cleaner units, and refuse vehicles. Nine speed ratios are available across the series, including both low and high-speed options. The SmartStart feature reduces shock load at engagement for applicable configurations.Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
