281GGFJW-B5RF Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GGFJW-B5RF or 281GGFJWB5RF, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison transmissions. The 281 Series is an evolution of the top-selling 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between housing and bearing cap for improved clamp load, and an enhanced clutch pack with steel discs 80% thicker than the previous design. Nine speed ratios cover both low and high-speed requirements. Rotatable cast-iron flanges reduce interference issues at the pump mounting face. Available output types include SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline outputs. Available from Pro Gear and Transmission. 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
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 previous design to resist premature tooth wear
Nine speed ratios including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Rotatable cast-iron flanges reduce pump clearance interference
SmartStart feature reduces shock load at start-up for applicable configurations
Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting Type: 10-Bolt aperture
• Shift Type: PowerShift (Hydraulic) hot-shift
• Continuous Operation: Yes
• Series Continuous Torque Rating: 390 lb-ft (529 Nm) - check application pages for actual torque ratings
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Options: 3/4 in. 11-tooth pump spline, SAE B 7/8 in. 13-tooth pump spline, SAE C 1-1/4 in. 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, SmartStart 1-1/4 in. round shaft with 5/16 in. key
• Shaft Power (series): 37 HP at 500 RPM, 74 HP at 1000 RPM
• Transmission Compatibility: Allison and Caterpillar automatic transmissions with 10-bolt aperture
• Lubricant Options: Pressure Lube or Wet Spline

Additional Information

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