The Chelsea 281 Series Power Take-Off Assembly, part number 281GMFJP-B8XD or 281GMFJPB8XD, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. The 281 Series is an evolution of the 280 Series, built around a ductile iron bearing cap rated 117% stronger than gray iron and an O-ring sealing configuration between the housing and bearing cap that improves clamp load and reduces vibrational effects. The clutch pack features steel discs 80% thicker than the predecessor for improved durability. Nine speed ratios cover both low and high ranges. A Wet Spline Lubrication option extends shaft life by 7 to 10 times. Electronic Overspeed Control (EOC) and SmartStart are available for added drivetrain protection. Contact Pro Gear and Transmission to confirm proper fit for your application.
The Chelsea 281 Series is suited for demanding hydraulic PTO applications in fire and rescue, refuse, truck crane, and pumper-cleaner vocations. Rotatable cast-iron flanges reduce pump clearance interference issues. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. For reference documents, Parker Chelsea publishes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Call Pro Gear and Transmission to confirm this part number fits your specific transmission configuration.
Features
Hydraulic PowerShift (hot-shift) operation for use with automatic transmissions
10-bolt mounting aperture fits Allison and Caterpillar transmission applications
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibration effects and improves clamp load
Clutch pack steel discs 80% thicker than the 280 Series for reduced tooth wear
Nine speed ratios including low and high speeds; Wet Spline Lubrication option extends shaft life 7 to 10 times
Tech Specs
- Mounting Type: 10-Bolt aperture
- Shift Type: PowerShift (Hydraulic hot-shift)
- Continuous Operation: Yes
- Transmission Application: Allison and Caterpillar automatic transmissions
- Series Continuous Torque (281 Series): 390 lb-ft (529 Nm) - verify actual rating on application page
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine, including low and high
- Lubrication: Pressure Lube or Wet Spline option
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for shock-load reduction at start-up
- Cross-reference: 5P1491, 5P1482
Additional Information
The Chelsea 281 Series is suited for demanding hydraulic PTO applications in fire and rescue, refuse, truck crane, and pumper-cleaner vocations. Rotatable cast-iron flanges reduce pump clearance interference issues. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling contact. For reference documents, Parker Chelsea publishes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Call Pro Gear and Transmission to confirm this part number fits your specific transmission configuration.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
