281GGFJP-K3RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GGFJP-K3RK or 281GGFJPK3RK, is a hydraulically shifted (PowerShift) hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. It delivers a single continuous duty torque rating with output options covering SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. The 281 Series is an evolution of the 280 Series, adding a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring seal between the housing and bearing cap to reduce vibrational effects, and an enhanced clutch pack with steel discs 80% thicker than its predecessor. Nine speed ratios span both low and high ranges, and a Wet Spline Lubrication option is available for extended shaft life. Call us to confirm proper fit for your specific transmission and application.

Features

Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmissions including Allison and Caterpillar
Ductile iron bearing cap rated 117% stronger than gray iron for improved durability
Enhanced clutch pack with steel discs 80% thicker than the predecessor 280 Series
O-ring sealing configuration between housing and bearing cap to reduce vibration effects and improve clamp load
Nine speed ratios covering both low and high speed ranges
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

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic Hot-Shift)
• Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application page
• Intermittent Torque: 301 to 400 lb-ft (501+ Nm)
• 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, SmartStart Round Shaft 1-1/4" with 5/16" Key
• Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
• Output Power: 56+ HP (51+ kW)
• Speed Ratios: Nine (low and high speeds included)
• Lubricant Options: Pressure Lube, Wet Spline
• Compatible Transmissions: Allison, Caterpillar (10-bolt aperture)
• Series: Chelsea 281 Series (evolution of 280 Series)

Additional Information

The Chelsea 281 Series is suited for demanding markets including fire and rescue, truck cranes, pumper cleaner, and refuse applications. The series supports continuous operation and is covered by Parker Chelsea documentation including the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Electronic Overspeed Control (EOC) is available to protect driven equipment from overspeed events, and the Positive Stop feature on driveline outputs eliminates oil seal damage caused by coupling contact.

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