281GDFJP-G3RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GDFJP-G3RK or 281GDFJPG3RK, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison transmissions. It is an evolution of the 280 Series, 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 predecessor design. Nine speed ratios cover both low and high speed demands. The series supports multiple output types including SAE B and SAE C pump flanges, ISO 7652, and driveline outputs. Applications include fire and rescue, truck cranes, pumper/cleaner, and refuse trucks. Call us to confirm proper fit for your specific transmission and application.

Features

Hydraulic PowerShift (hot-shift) operation for use on automatic transmissions with a 10-bolt aperture
Ductile iron bearing cap is 117% stronger than gray iron for improved durability
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 the predecessor 280 Series design
Nine speed ratios available, including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Positive stop for driveline outputs eliminates oil seal damage from coupling
Rotatable cast iron flanges reduce interference and improve pump clearance

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic PowerShift (Hot Shift)
• Compatible Transmissions: Allison automatic transmissions (10-bolt aperture)
• Continuous Operation: Yes
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Options: 3/4 in. 11T Pump Spline, SAE B 7/8 in. 13T Pump Spline, SAE C 1-1/4 in. 14T Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, SmartStart Round Shaft 1-1/4 in. with 5/16 in. Key
• Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
• Speed Ratios: 9 (includes low and high speeds)
• Lubrication: Pressure Lube or Wet Spline options
• 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.