281GGFJP-B8RB Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GGFJP-B8RB or 281GGFJPB8RB, is a hydraulically shifted (PowerShift) hot-shift PTO designed for 10-bolt aperture automatic transmissions, commonly Allison and Caterpillar units. The 281 Series carries a continuous torque rating of 390 lb-ft (529 Nm) and delivers output power of 56 HP or greater. It mounts via a 10-bolt flange and offers nine speed ratios covering both low and high ranges. Key engineering upgrades over the predecessor 280 Series include a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between housing and bearing cap, and clutch pack steel discs increased 80% in thickness to resist premature wear. Rotatable cast-iron flanges reduce pump clearance interference. The Wet Spline Lubrication option extends shaft life by 7 to 10 times. SmartStart reduces shock load at engagement, and Electronic Overspeed Control (EOC) protects driven equipment. Typical markets include fire and rescue, refuse, truck cranes, and pumper-cleaner applications. Call us to confirm proper fit for your transmission and application.

Features

Hydraulic (PowerShift) hot-shift operation - designed for 10-bolt automatic transmission apertures including Allison and Caterpillar
Ductile iron bearing cap - 117% stronger than gray iron for improved durability
O-ring sealing configuration between housing and bearing cap - improves clamp load and resists vibrational effects
Enhanced clutch pack - steel discs increased 80% in thickness to resist premature tooth wear
Nine speed ratios including low and high speeds; continuous torque rating of 390 lb-ft (529 Nm)
Wet Spline Lubrication option provides 7 to 10 times greater shaft life; SmartStart reduces engagement shock load; 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)
• Output Power: 56+ HP (51+ kW)
• 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)
• Transmission Compatibility: Allison and Caterpillar (10-bolt aperture)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubrication: Pressure Lube or Wet Spline options
• Continuous Operation: Yes

Additional Information

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