281GGFJW-B5RZ Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GGFJW-B5RZ or 281GGFJWB5RZ, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. The 281 Series delivers a single continuous-duty torque rating of 390 lb-ft (529 Nm), with output options spanning SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline configurations. Nine speed ratios cover both low and high ranges. 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 reducing vibrational effects. The clutch pack uses steel discs 80% thicker than the predecessor 280 Series design. Common markets include fire and rescue, refuse, truck cranes, and pumper/cleaner applications. A genuine Chelsea part sold by Pro Gear and Transmission - call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot-shift) operation on 10-bolt automatic transmission aperture, designed for Allison and Caterpillar transmissions
Ductile iron bearing cap rated 117% stronger than gray iron for improved durability under vibrational loads
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 the 280 Series predecessor to resist premature tooth wear
Nine speed ratios including low and high speeds; wet spline lubrication option extends shaft life 7 to 10 times
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart option reduces shock load at start-up

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic (PowerShift / Hot-Shift)
• Compatible Transmissions: Allison and Caterpillar (10-bolt aperture)
• Continuous Torque Rating: 390 lb-ft (529 Nm)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Speed Ratios: Nine (includes low and high speeds)
• Output Shaft Options: 3/4 in. 11T pump spline, SAE B 7/8 in. 13T pump spline, SAE C 1-1/4 in. 14T pump spline, SmartStart round shaft (1-1/4 in. - 5/16 in. key), 1410 companion flange, DIN 100 flange, DIN 120 flange, DIN 5462 pump spline
• Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
• Lubrication: Pressure lube or wet spline options available
• 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.