The Chelsea 281 Series Power Take-Off assembly, part number 281GSFJR-B5RK or 281GSFJRB5RK, 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 the evolution of the 280 Series, with a ductile iron bearing cap rated 117% stronger than gray iron, an 80% thicker steel clutch pack to resist premature tooth wear, and an o-ring sealing configuration between the housing and bearing cap for improved clamp load. Nine speed ratios cover both low and high speed ranges. Output options include SAE B and SAE C pump flanges, ISO 7652 pump flanges, and driveline configurations. Cross-referenced as 5P1491 and 5P1484. Call us to confirm proper fit for your application.
Features
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios available, including low and high speed ranges
Wet spline lubrication option extends shaft life 7 to 10 times compared to standard
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at start-up
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) - Hot Shift
- Compatible Transmissions: Allison and Caterpillar automatic transmissions (10-bolt aperture)
- Continuous Torque Rating: 390 lb-ft (529 Nm)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: 1-1/4" round shaft (5/16" key), 3/4" 11-tooth pump spline, SAE B 7/8" 13-tooth pump spline, SAE C 1-1/4" 14-tooth pump spline, 1410 companion flange
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1,000 RPM
- Speed Ratios: Nine, including low and high
- Lubrication: Pressure lube or wet spline options
- Cross-Reference: 5P1491, 5P1484
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
