281GKKVP-B5RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GKKVP-B5RK or 281GKKVPB5RK, is a hydraulically shifted (PowerShift) hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, commonly including Allison and Caterpillar transmissions. It carries a continuous torque rating of 390 lb-ft (529 Nm) across nine speed ratios spanning low and high ranges. The 281 Series is an evolution of the 280 Series, upgrading to a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap for improved clamp load, and steel clutch discs that are 80% thicker to resist premature tooth wear. Rotatable cast-iron flanges reduce interference clearance issues, and a Positive Stop feature on driveline outputs prevents oil seal damage from coupling contact. A Wet Spline Lubrication option extends shaft life by 7 to 10 times. SmartStart reduces shock load at startup, and Electronic Overspeed Control (EOC) protects driven equipment. Typical 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 for improved durability
Enhanced Clutch Pack - steel discs are 80% thicker to resist premature tooth wear
O-Ring Sealing Configuration - between housing and bearing cap to improve clamp load and reduce vibrational effects
Nine Speed Ratios - includes low and high speed options
Wet Spline Lubrication Option - provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) - protects driven equipment from overspeed damage
SmartStart - reduces shock load at startup for compatible applications
Positive Stop on Driveline Outputs - eliminates oil seal damage from coupling contact
Rotatable Cast-Iron Flanges - reduce interference clearance issues

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic Hot-Shift)
• Continuous Torque: 390 lb-ft (529 Nm)
• Speed Ratios: Nine (includes low and high speeds)
• Continuous Operation: Yes
• Compatible Transmission Type: Automatic (10-bolt aperture, e.g. Allison)
• Lubrication: Pressure Lube or Wet Spline (application-dependent)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline

Additional Information

Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.