Features
Hydraulic (PowerShift) hot-shift operation for Allison 10-bolt aperture automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration 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
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at start-up
Wet spline lubrication option provides 7 to 10 times greater shaft life
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
- Shift Type: PowerShift (Hydraulic hot-shift)
- Continuous Operation: Yes
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) -- verify actual rating on Chelsea application pages for this configuration
- Output Power (series): 56+ HP (51+ kW)
- Speed Ratios: Nine (includes low and high speeds)
- Compatible Transmission Manufacturers: Allison (and Caterpillar 10-bolt aperture)
- Lubricant Options: Pressure Lube or Wet Spline
- Output Types available in series: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
Additional Information
Typical markets for the Chelsea 281 Series include fire and rescue apparatus, refuse trucks, pumper-cleaner units, and truck cranes. The 281 Series succeeds the 280 Series PTO with structural and sealing upgrades focused on durability under the vibrational demands of modern engine designs. Parker Chelsea reference documents for this series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
