Features
Hydraulic hot-shift (PowerShift) operation for use with 10-bolt aperture automatic transmissions including Allison
Ductile iron bearing cap rated 117% stronger than gray iron
O-ring sealing between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart feature reduces shock load at start-up for select applications
Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast iron flanges reduce pump clearance interference
Positive stop for driveline outputs eliminates oil seal damage from coupling
Tech Specs
- Mounting Type: 10-Bolt aperture (Allison automatic transmission)
- Shift Type: Hydraulic hot-shift (PowerShift)
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Speed Ratios: Nine, including low and high
- Lubrication Option: Wet Spline (W) - 7 to 10 times greater shaft life
- Series Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM (28 kW at 500 RPM, 55 kW at 1000 RPM)
- Part Number: 281GSFJW-D5RY or 281GSFJWD5RY
Additional Information
The 281 Series is suited for demanding mobile equipment applications including fire and rescue, truck cranes, pumper-cleaner, and refuse vehicles. Parker Chelsea publishes supporting documentation for this series including the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Contact Pro Gear and Transmission to confirm the correct 281 Series configuration for your transmission and driven equipment.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
