281GKFJP-B5SB Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off (part number 281GKFJP-B5SB or 281GKFJPB5SB) is a hydraulically shifted, hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. It carries a single, continuous-duty torque rating and delivers output through SAE B and SAE C pump flanges, ISO 7652 flanges, and driveline configurations. 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 while countering the vibrational effects of modern engine designs. The clutch pack features steel discs that are 80% thicker to resist premature tooth wear. Nine speed ratios cover both low- and high-speed needs, and the optional wet spline lubrication provides 7 to 10 times greater shaft life. Electronic Overspeed Control (EOC) protects downstream driven equipment. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.

Features

Hydraulic (PowerShift) hot-shift operation for automatic transmissions with 10-bolt aperture, including Allison and Caterpillar applications
Ductile iron bearing cap rated 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 predecessor design to resist premature tooth wear
Nine speed ratios including low- and high-speed ranges
Electronic Overspeed Control (EOC) protects driven equipment from overspeed damage
Wet spline lubrication option provides 7 to 10 times greater shaft life
Positive stop for driveline outputs eliminates oil seal damage from coupling
SmartStart feature reduces shock load at start-up on applicable configurations

Tech Specs

• Mounting Type: 10-Bolt aperture
• Shift Type: PowerShift (Hydraulic), hot-shift
• Compatible Transmissions: Allison and Caterpillar automatic transmissions
• Continuous Operation: Yes
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Options: 3/4" - 11T Pump Spline, SAE B (7/8" - 13T) Pump Spline, SAE C (1-1/4" - 14T) Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange, SmartStart Round Shaft (1-1/4" - 5/16" Key)
• Speed Ratios: Nine, including low and high speeds
• Lubricant Options: Pressure Lube (P), Wet Spline (W)

Additional Information

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