281GSFJP-K8BD Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GSFJP-K8BD or 281GSFJPK8BD, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. This unit mounts to the 10-bolt aperture and offers nine speed ratios covering both low and high ranges. The series continuous torque rating is 390 lb-ft (529 Nm), with output options including SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline outputs. A ductile iron bearing cap delivers 117% greater strength than gray iron, and the clutch pack uses steel discs 80% thicker than the predecessor 280 Series. The wet spline lubrication option provides 7 to 10 times greater shaft life. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot-shift) operation for Allison 10-bolt aperture transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Clutch pack steel discs increased 80% in thickness over 280 Series for reduced tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibration
Nine speed ratios including low and high speeds; series continuous torque rated at 390 lb-ft (529 Nm)
Wet spline lubrication option provides 7 to 10 times greater shaft life; Electronic Overspeed Control (EOC) protects driven equipment
SmartStart feature reduces shock load at start-up; positive stop for driveline outputs eliminates oil seal damage

Tech Specs

• Mounting Type: 10-Bolt aperture (Allison automatic transmissions)
• Shift Type: PowerShift - Hydraulic (hot-shift)
• Continuous Torque (series rating): 390 lb-ft / 529 Nm
• Speed Ratios: Nine, including low and high
• 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
• Lubrication: Pressure Lube (P) or Wet Spline (W) option
• Shaft Power (series): 37 HP at 500 RPM / 74 HP at 1000 RPM
• Continuous Operation: Yes
• Typical Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse

Additional Information

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