The Chelsea 281 Series Power Take-Off (part number 281GMFJP-L5RY or 281GMFJPL5RY) is a hydraulically shifted, hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. It carries a continuous torque rating of 390 lb-ft (529 Nm) and offers nine speed ratios covering both low and high ranges. Output options span SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. The ductile iron bearing cap is 117% stronger than gray iron, and an 80% thicker clutch pack resists premature tooth wear. Rotatable cast-iron flanges reduce interference fit issues, and the Wet Spline Lubrication option extends shaft life by 7 to 10 times. Common markets include fire and rescue, truck cranes, refuse, and pumper cleaner applications. Call us to confirm proper fit for your application.
The Chelsea 281 Series is an evolution of the 280 Series PTO, engineered to address the vibrational demands of modern engine designs. Applications served include fire and rescue, refuse collection, truck cranes, and pumper cleaner vehicles. The Electronic Overspeed Control (EOC) option protects downstream driven equipment, while the SmartStart feature reduces shock load during engagement for select applications. Hose is included with the assembly. Relevant Parker Chelsea documentation includes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Features
Hydraulic hot-shift (PowerShift) operation for use with 10-bolt automatic transmissions including Allison
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios available, including low and high speeds; continuous torque rating of 390 lb-ft (529 Nm)
Electronic Overspeed Control (EOC) and SmartStart options protect driven equipment and reduce start-up shock load
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic (PowerShift / Hot Shift)
- Compatible Transmissions: Allison and Caterpillar automatic transmissions
- Continuous Torque: 390 lb-ft (529 Nm)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: SmartStart Round Shaft (1-1/4" - 5/16" Key), 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
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Lubrication: Pressure Lube or Wet Spline (option)
- Continuous Operation: Yes
- Speed Ratios: Nine (includes low and high speeds)
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series PTO, engineered to address the vibrational demands of modern engine designs. Applications served include fire and rescue, refuse collection, truck cranes, and pumper cleaner vehicles. The Electronic Overspeed Control (EOC) option protects downstream driven equipment, while the SmartStart feature reduces shock load during engagement for select applications. Hose is included with the assembly. Relevant Parker Chelsea documentation includes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices
