The Chelsea 281GGFJW-G5RS is a 281 Series PowerShift (hydraulic) hot-shift power take-off designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. The 281 Series delivers up to 390 lb-ft continuous torque and supports continuous-duty operation across nine available speed ratios. Key structural upgrades over its predecessor include 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 steel clutch-pack discs increased 80% in thickness to resist premature wear. A wet spline lubrication option is available for extended shaft life. Common markets include fire and rescue, refuse, truck cranes, and pumper-cleaner applications. Part number 281GGFJW-G5RS is sold by Pro Gear and Transmission.
Features
Hydraulic PowerShift (hot-shift) engagement for automatic transmissions
10-bolt mounting aperture, compatible with Allison and Caterpillar transmissions
Continuous-duty torque rating up to 390 lb-ft (529 Nm)
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap for improved clamp load
80% thicker steel clutch-pack discs for extended wear resistance
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
- Output Shaft Options: 1-1/4" Round (5/16" Key), 3/4"-11T Pump Spline, SAE B 7/8"-13T, SAE C 1-1/4"-14T, DIN 5462 Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Speed Ratios: Nine available
- Lubrication: Pressure lube and wet spline options available
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO, introduced with structural and sealing upgrades specifically aimed at reducing vibrational damage from modern engine designs. Markets served include fire and rescue, refuse collection, truck cranes, and pumper-cleaner equipment. The Electronic Overspeed Control (EOC) option protects driven equipment from overspeed events. The SmartStart feature reduces shock load at engagement for applicable configurations. Rotatable cast iron flanges allow adjustment for improved pump clearance at installation.Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
