281GSFJP-B3SV Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GSFJP-B3SV or 281GSFJPB3SV, is a hydraulically shifted hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. This is an evolution of the 280 Series, with a ductile iron bearing cap rated 117% stronger than gray iron and an 80% thicker clutch pack to resist premature tooth wear. An O-ring sealing configuration between the housing and bearing cap improves clamp load and reduces the damaging effects of engine vibration. Nine speed ratios cover both low and high-speed demands. Rotatable cast-iron flanges reduce interference fit issues at the pump mount. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.

Features

Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap reduces vibration effects and improves clamp load
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios including low and high-speed options
Rotatable cast-iron flanges reduce pump clearance interference
Wet Spline Lubrication option extends shaft life 7 to 10 times over standard lubrication
SmartStart feature reduces shock load at start-up for select applications
Electronic Overspeed Control (EOC) protects driven equipment
Positive stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic) Hot Shift
• Compatible Transmission Manufacturers: Allison, Caterpillar (10-bolt aperture automatics)
• Continuous Operation: Yes
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Options: SmartStart Round Shaft (1-1/4" with 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
• Lubricant Options: Pressure Lube, Wet Spline
• Series Continuous Torque Rating: 390 lb-ft (529 Nm)
• Shaft Power: 37 HP at 500 RPM; 74 HP at 1000 RPM
• Speed Ratios: Nine, including low and high
• Series Part: 281 Series (evolution of 280 Series)
• NMFC Code: 125820 (Hydraulic PTOs, Pumps, Motors)

Additional Information

The Chelsea 281 Series is suited for demanding continuous-duty markets including fire and rescue, truck cranes, pumper cleaner units, and refuse vehicles. Reference documents for this series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, which cover service, rebuild, and application guidance. The alternate part number for cross-reference purposes is SP281GSFJP-B3SV.

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