The Chelsea 281 Series Power Take-Off, part number 281GKFJP-B5RY or 281GKFJPB5RY, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. Built as an evolution of the 280 Series, it features a ductile iron bearing cap rated 117% stronger than gray iron and an enhanced clutch pack with 80% thicker steel disks to resist premature tooth wear. An o-ring sealing configuration between the housing and bearing cap improves clamp load and reduces vibrational effects. Nine speed ratios cover both low and high ranges, and the series is rated for continuous operation. Output options include SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, and driveline configurations. Common markets include fire and rescue, refuse, pumper-cleaner, and truck crane applications. Call us to confirm proper fit for your specific transmission and application.
Features
Ductile iron bearing cap, 117% stronger than gray iron, reduces vibrational damage from modern engine designs
Enhanced clutch pack with steel disks 80% thicker than the predecessor 280 Series to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load
Nine speed ratios including low and high speeds; rated for continuous operation
Wet spline lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) and SmartStart available to protect driven equipment and reduce shock load at start-up
Tech Specs
- Mounting Type: 10-Bolt aperture (Allison automatic transmissions)
- Shift Type: PowerShift - Hydraulic hot-shift
- Continuous Operation: Yes
- Continuous Torque Rating: 390 lb-ft (529 Nm) - check application pages for actual torque rating
- Intermittent Torque Range: 301 to 400 lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM (28 kW at 500 RPM, 55 kW at 1000 RPM)
- 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. 11-tooth pump spline, SAE B 7/8 in. 13-tooth pump spline, SAE C 1-1/4 in. 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, DIN 120 flange, DIN 100 flange
- Lubrication: Pressure lube or wet spline option
- Speed Ratios: Nine ratios including low and high
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
