The Chelsea 281 Series Power Take-Off, part number 281GPFJP-K3RK or 281GPFJPK3RK, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. The 281 Series is an evolution of the 280 Series platform, featuring a ductile iron bearing cap rated 117% stronger than gray iron and an O-ring sealing configuration between the housing and bearing cap to improve clamp load and reduce vibrational effects from modern engine designs. The clutch pack uses steel discs 80% thicker than the previous generation to resist premature tooth wear. Nine speed ratios cover both low- and high-speed demands. The series continuous torque rating is 390 lb-ft. Output options include SAE B and SAE C pump flanges, ISO 7652 pump flanges, and driveline configurations. Call us to confirm proper fit for your transmission and application.
Features
Ductile iron bearing cap - 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with steel discs 80% thicker than previous generation to resist premature tooth wear
Nine speed ratios including low and high speeds
Rotatable cast-iron flanges reduce interference and improve pump clearance
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart option reduces shock load at start-up
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Series Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: SmartStart Round Shaft (1-1/4" - 5/16" Key), SAE B (7/8" - 13T) Pump Spline, SAE C (1-1/4" - 14T) Pump Spline, 1410 Companion Flange
- Speed Ratios: Nine ratios (low and high speed range)
- Continuous Operation: Yes
- Lubrication: Pressure Lube or Wet Spline option
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
