The Chelsea 281GMFJP-B3SD or 281GMFJPB3SD is a 281 Series hydraulically shifted (PowerShift) Power Take-Off built for automatic transmissions with a 10-bolt aperture, commonly used on Allison transmissions. The series carries a continuous torque rating of 390 lb-ft (529 Nm) and offers nine speed ratios spanning low and high ranges. A ductile iron bearing cap delivers 117% greater strength than gray iron, and an O-ring sealing configuration between the housing and bearing cap improves clamp load and resists the vibrational effects of modern engine designs. The clutch pack uses steel disks that are 80% thicker than the predecessor 280 Series design to resist premature tooth wear. Wet Spline Lubrication extends shaft life 7 to 10 times over standard configurations. Electronic Overspeed Control (EOC) and the SmartStart feature help protect driven equipment at engagement. Compatible hose is included. Call us to confirm proper fit for your transmission and application.
The Chelsea 281 Series supersedes the 280 Series and addresses the vibrational demands of modern and future engine designs through structural and sealing upgrades. Markets served include fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Parker Chelsea documentation for this series includes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, available through Parker Chelsea.
Features
10-bolt mounting aperture fits Allison automatic transmissions
Hydraulic PowerShift (hot shift) operation supports continuous-duty use
390 lb-ft (529 Nm) continuous torque rating across nine speed ratios including low and high
Ductile iron bearing cap, 117% stronger than gray iron, with O-ring sealed housing interface
Clutch pack steel disks are 80% thicker than the 280 Series predecessor to resist premature tooth wear
Wet Spline Lubrication option provides 7 to 10 times greater shaft life; hose included
SmartStart reduces engagement shock load; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Continuous Torque: 390 lb-ft (529 Nm)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Speed Ratios: Nine, including low and high speeds
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube (P) or Wet Spline (W) option
- Series: Chelsea 281 Series (evolution of the 280 Series)
Additional Information
The Chelsea 281 Series supersedes the 280 Series and addresses the vibrational demands of modern and future engine designs through structural and sealing upgrades. Markets served include fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Parker Chelsea documentation for this series includes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, available through Parker Chelsea.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
