281GKFJP-K5RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GKFJP-K5RK or 281GKFJPK5RK, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison transmissions. It is the direct evolution of the Chelsea 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron and an 80% thicker clutch pack steel disc to resist premature tooth wear. An O-ring sealing configuration between the housing and bearing cap improves clamp load and reduces vibrational effects from modern engine designs. Rotatable cast-iron flanges ease pump clearance, and the wet spline lubrication option extends shaft life 7 to 10 times. Nine speed ratios cover both low and high operating speeds. Pro Gear and Transmission carries this genuine Chelsea part. Call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission apertures, including Allison
Ductile iron bearing cap rated 117% stronger than gray iron predecessor
80% thicker steel discs in the clutch pack to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap to reduce vibrational effects and improve clamp load
Rotatable cast-iron flanges reduce interference and improve pump clearance
Wet spline lubrication option provides 7 to 10 times greater shaft life
Nine speed ratios including low and high speeds
SmartStart feature reduces shock load at start-up for applicable configurations
Electronic Overspeed Control (EOC) protects driven equipment
Positive stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic PowerShift (Hot-Shift)
• Compatible Transmission: Allison automatic transmissions (10-bolt aperture)
• Continuous Operation: Yes
• Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
• Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubrication: Wet Spline option available
• Speed Ratios: Nine (includes low and high)
• SmartStart: Yes, on applicable configurations
• Electronic Overspeed Control (EOC): Included

Additional Information

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