281GKFJP-D5AC Chelsea PTO Assembly

Chelsea part number 281GKFJP-D5AC or 281GKFJPD5AC is a 281 Series Power Take-Off assembly designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. It uses hydraulic PowerShift engagement for hot-shift operation, making it well-suited for continuous-duty applications in refuse, fire and rescue, truck crane, and pumper-cleaner equipment. The 281 Series is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between housing and bearing cap to improve clamp load, and an enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear. Nine speed ratios cover both low- and high-speed output demands. Available output types include SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. Call us to confirm the correct ratio and output configuration for your transmission and driven equipment.

Features

Hydraulic PowerShift (hot-shift) engagement for Allison and Caterpillar 10-bolt automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibrational effects
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios available, including low- and high-speed options
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
Rotatable cast-iron flanges reduce pump interference clearance issues
Positive stop on driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt aperture (Allison and Caterpillar automatic transmissions)
• Shift Type: Hydraulic PowerShift (hot-shift)
• Continuous Operation: Yes
• Series Continuous Torque Rating: 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: 3/4" 11-tooth pump spline, SAE B 7/8" 13-tooth pump spline, SAE C 1-1/4" 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, DIN 100 flange, DIN 120 flange, SmartStart round shaft (1-1/4" with 5/16" key)
• Lubricant Options: Pressure lube or wet spline
• Speed Ratios: Nine ratios including low and high speed
• Series Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM (28 kW at 500 RPM, 55 kW at 1000 RPM)
• 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.