Description
The Chelsea 281GMFJP-B3SV or 281GMFJPB3SV is a 281 Series hydraulically shifted hot-shift Power Take-Off built for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. The 281 Series delivers a continuous torque rating of 390 lb-ft (529 Nm) and offers nine speed ratios covering both low and high ranges. It mounts with a 10-bolt pattern and supports multiple output types including SAE B and SAE C pump flanges, ISO 7652 pump flange, and driveline outputs. Key design upgrades over the predecessor 280 Series include 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 clutch pack steel disc. The Wet Spline Lubrication option extends shaft service life by 7 to 10 times. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
10-bolt mount for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) operation for on-the-go engagement
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing between housing and bearing cap reduces vibration effects and improves clamp load
80% thicker steel discs in the clutch pack resist premature tooth wear
Nine speed ratios available, including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects downstream driven equipment
SmartStart feature reduces shock load at engagement for compatible applications
Rotatable cast-iron flanges reduce interference clearance issues with pump mounting
Tech Specs
- Mounting Type: 10-bolt aperture (Allison automatic transmissions)
- Shift Type: Hydraulic PowerShift (hot-shift)
- Continuous Torque: 390 lb-ft (529 Nm)
- Intermittent Torque: 301 to 400 lb-ft (501+ Nm)
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Output Shaft Options: SmartStart round shaft (1-1/4 in. with 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
- Speed Ratios: Nine ratios (low and high speeds included)
- Lubricant System: Pressure lube or Wet Spline option
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM (28 kW at 500 RPM, 55 kW at 1000 RPM)
- 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.
