The Chelsea 281 Series Power Take-Off, part number 281GGFJW-H8RY or 281GGFJWH8RY, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. It is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron and an o-ring sealing configuration between the housing and bearing cap for improved clamp load. The clutch pack uses 80% thicker steel disks to resist premature tooth wear. Nine speed ratios cover both low and high-speed applications. Output options include SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. The series carries a single, continuous-duty torque rating. Applications span fire and rescue, refuse, truck cranes, and pumper-cleaner vehicles. Call us to confirm proper fit for your specific transmission and application.
Features
Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission apertures, including Allison
Ductile iron bearing cap rated 117% stronger than gray iron for increased durability
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel disks to resist premature tooth wear
Nine speed ratios available, including low and high-speed options
Wet Spline Lubrication option provides 7 to 10 times greater shaft life; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt aperture (Allison automatic transmissions)
- Shift Type: Hydraulic PowerShift (hot-shift)
- Continuous Duty: Yes, single continuous-duty torque rating
- Series Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application page
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, Driveline
- Output Shaft Options: 3/4 in. 11T pump spline, SAE B 7/8 in. 13T pump spline, SAE C 1-1/4 in. 14T pump spline, DIN 5462 pump spline, 1410 companion flange, SmartStart round shaft (1-1/4 in. with 5/16 in. key)
- Speed Ratios: Nine (including low and high speeds)
- Lubrication: Pressure lube or wet spline options
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
