281GDFJP-D3AC Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GDFJP-D3AC or 281GDFJPD3AC, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. This unit carries a single, continuous duty torque rating and offers nine speed ratios covering both low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, and an O-ring sealing configuration between the housing and bearing cap improves clamp load and resists vibration from modern engine designs. The clutch pack uses steel discs 80% thicker than the predecessor 280 Series to resist premature tooth wear. Rotatable cast-iron flanges reduce interference issues at installation, and the Wet Spline Lubrication option extends shaft life by 7 to 10 times. Electronic Overspeed Control (EOC) protects driven equipment, and the SmartStart feature reduces shock load at start-up for compatible applications. Call us to confirm proper fit for your transmission and application.

Features

Hydraulic PowerShift (hot-shift) operation on 10-bolt automatic transmission aperture, commonly Allison
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring seal between housing and bearing cap improves clamp load and dampens vibration
Enhanced clutch pack with steel discs 80% thicker than the 280 Series predecessor
Nine speed ratios including low and high speeds
Wet Spline Lubrication option extends shaft life 7 to 10 times; hose included
SmartStart reduces start-up shock load; Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast-iron flanges reduce pump clearance interference; Positive Stop eliminates oil seal damage on driveline outputs

Tech Specs

• Mounting: 10-Bolt aperture (Allison automatic transmissions)
• Shift Type: PowerShift - Hydraulic (hot-shift)
• Continuous Torque: 390 lb-ft (529 Nm) - see application pages for actual rating
• Intermittent Torque: 301 to 400 lb-ft (501+ Nm) range
• Output Power: 56+ HP (51+ kW)
• Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM (28 kW at 500 RPM / 55 kW at 1000 RPM)
• Speed Ratios: Nine, including low and high
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Options: 1-1/4" round with 5/16" key (SmartStart), 3/4"-11T pump spline, SAE B 7/8"-13T, SAE C 1-1/4"-14T, DIN 5462, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange
• Lubrication: Pressure Lube or Wet Spline option
• Continuous Operation: Yes
• Typical 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.