281GSFJP-B8SV Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GSFJP-B8SV or 281GSFJPB8SV, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. The 281 Series builds on the proven 280 Series platform with a ductile iron bearing cap rated 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap for improved clamp load, and an enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear. Nine speed ratios cover both low and high-speed applications. Rotatable cast iron flanges reduce interference clearance issues, and the wet spline lubrication option extends shaft life by 7 to 10 times. SmartStart reduces shock load at start-up, and Electronic Overspeed Control (EOC) protects driven equipment. This series supports fire and rescue, truck cranes, pumper cleaner, and refuse applications. Call us to confirm proper fit for your specific transmission and application.

Features

Chelsea 281 Series hydraulic PowerShift (hot-shift) PTO, 10-bolt mounting for Allison automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibrational effects
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios including low and high speeds; continuous duty operation supported
Wet spline lubrication option provides 7 to 10 times greater shaft life; SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic (PowerShift / Hot-Shift)
• Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
• Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
• Output Power: 56+ HP (51+ kW)
• Shaft Power: 37 HP at 500 RPM; 74 HP at 1000 RPM
• Continuous Operation: Yes
• Speed Ratios: Nine (includes low and high speeds)
• Lubrication Options: Pressure Lube (P), Wet Spline (W)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Options: SmartStart Round Shaft (1-1/4" - 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

Additional Information

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