281GCFJW-B5RF Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GCFJW-B5RF or 281GCFJWB5RF, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly used on Allison transmissions. It mounts to the transmission and delivers continuous-duty operation across nine speed ratios, covering both low and high speed ranges. 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, and an 80% thicker steel clutch pack to resist premature tooth wear. Rotatable cast-iron flanges reduce interference issues at the pump mount. Common applications include fire and rescue, truck cranes, pumper-cleaner, and refuse trucks. Call us to confirm proper fit for your application.

Features

10-bolt mounting aperture for Allison automatic transmissions
Hydraulic PowerShift (hot-shift) operation for on-the-go engagement
Ductile iron bearing cap, 117% stronger than gray iron
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high speeds
Wet spline lubrication option extends shaft life 7 to 10 times over standard
SmartStart output reduces shock load at start-up
Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast-iron flanges reduce pump clearance interference
Positive stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic PowerShift (Hot-Shift)
• Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
• Continuous Operation: Yes
• Speed Ratios: Nine (includes low and high speeds)
• Lubrication Option: Wet Spline (W) - provides 7 to 10 times greater shaft life
• Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Types Available: SmartStart Round Shaft (1-1/4 in. - 5/16 in. key), 3/4 in. 11-tooth pump spline, SAE B 7/8 in. 13-tooth pump spline, SAE C 1-1/4 in. 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, DIN 120 flange, DIN 100 flange
• 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
• Electronic Overspeed Control (EOC): Included
• SmartStart: Available for certain applications
• Part Number: 281GCFJW-B5RF or 281GCFJWB5RF
• Related Documents: 281/288 Series Parts List HY25-2281-M1/US; 267/281/288/871/878 Series Owner Manual; 281 Series Sales Literature

Additional Information

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