281GTFJP-N5XV Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GTFJP-N5XV or 281GTFJPN5XV, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, commonly used with Allison transmissions. The 281 Series is an evolution of the 280 Series, with a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap to improve clamp load and resist vibration, and an enhanced clutch pack with 80% thicker steel disks to reduce premature tooth wear. Nine speed ratios cover both low and high-speed applications. Rotatable cast-iron flanges reduce pump clearance interference, and a Positive Stop feature on driveline outputs eliminates oil seal damage from coupling. Sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot-shift) operation designed for Allison 10-bolt automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron for increased durability
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel disks 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
Positive Stop for driveline outputs eliminates oil seal damage from coupling
SmartStart reduces shock load at start-up for compatible applications
Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic (PowerShift / Hot-Shift)
• Continuous Operation: Yes
• Transmission Manufacturer: Allison
• Output Type: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Options: SmartStart Round Shaft (1-1/4 in. - 5/16 in. Key), 3/4 in. - 11T Pump Spline, SAE B (7/8 in. - 13T) Pump Spline, SAE C (1-1/4 in. - 14T) Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange
• Lubricant Options: Pressure Lube (P), Wet Spline (W)
• Series Continuous Torque Rating: 390 lb-ft (529 Nm) - see application pages for actual torque ratings
• Series 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 speeds
• Typical Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse

Additional Information

The Chelsea 281 Series PTO is documented in the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Stud kit information is covered in Chelsea PTO Stud Kits document HY25-2002-M1_US. These references are available through Parker Chelsea for installation, service, and parts identification support.

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