The Chelsea 281GSFJW-B8RY or 281GSFJWB8RY is a 281 Series hydraulically shifted hot-shift power take-off built for automatic transmissions with a 10-bolt aperture, commonly fitted to Allison and Caterpillar transmissions. The 281 Series delivers a continuous torque rating of 390 lb-ft (529 Nm) and offers nine speed ratios covering both low and high ranges. Mounting uses the 10-bolt pattern, and output options include SAE B and SAE C pump flanges, ISO 7652 flanges, and driveline configurations. The ductile iron bearing cap is 117% stronger than the gray iron cap used in the previous-generation 280 Series, and the clutch pack features steel disks 80% thicker than the predecessor design. Electronic Overspeed Control (EOC) is included to protect driven equipment. Call us to confirm proper fit for your application.
The 281 Series is an evolution of the Chelsea 280 Series PTO. Key improvements over the 280 Series include the ductile iron bearing cap, an O-ring sealing configuration between the housing and bearing cap for improved clamp load, and the 80% thicker steel clutch pack disks. These changes address vibrational effects generated by modern engine designs. The series is used across fire and rescue apparatus, truck cranes, pumper cleaners, and refuse vehicles. SmartStart reduces shock load at engagement for compatible applications. Hose is included; no separate order needed. Reference documents: 281/288 Series Parts List HY25-2281-M1/US and the 267/281/288/871/878 Series Owner's Manual.
Features
10-bolt mounting aperture, compatible with Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) operation for continuous-duty use
390 lb-ft (529 Nm) continuous torque rating across nine available speed ratios
Ductile iron bearing cap, 117% stronger than the gray iron cap used in the 280 Series predecessor
Enhanced clutch pack with steel disks 80% thicker to resist premature tooth wear
Electronic Overspeed Control (EOC) protects driven equipment; Wet Spline lubrication option extends shaft life 7 to 10 times
Tech Specs
- Mounting: 10-bolt aperture
- Shift Type: Hydraulic PowerShift (hot-shift)
- Continuous Torque: 390 lb-ft (529 Nm)
- Compatible Transmissions: Allison, Caterpillar automatic transmissions
- Speed Ratios: Nine (includes low and high speeds)
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Output Shaft Options: SmartStart round shaft (1-1/4 in. with 5/16 in. key), 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, DIN 120 flange, DIN 100 flange
- Lubrication: Pressure lube or Wet Spline option
- Continuous Operation: Yes
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO. Key improvements over the 280 Series include the ductile iron bearing cap, an O-ring sealing configuration between the housing and bearing cap for improved clamp load, and the 80% thicker steel clutch pack disks. These changes address vibrational effects generated by modern engine designs. The series is used across fire and rescue apparatus, truck cranes, pumper cleaners, and refuse vehicles. SmartStart reduces shock load at engagement for compatible applications. Hose is included; no separate order needed. Reference documents: 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.
