Features
Hydraulic PowerShift (hot-shift) operation for Allison 10-bolt aperture transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap improves clamp load and reduces vibrational effects
80% thicker steel discs in clutch pack 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 reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Rotatable cast-iron flanges reduce interference issues; Positive Stop for driveline outputs eliminates oil seal damage
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot Shift)
- Compatible Transmission: Allison (10-Bolt Aperture)
- Continuous Operation: Yes
- Speed Ratios: Nine (including low and high speeds)
- Lubrication Options: Pressure Lube (P) or Wet Spline (W)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual application torque on Chelsea application pages
- Series 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)
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for applicable configurations
Additional Information
The 281 Series is supported by the following Parker Chelsea documentation: 281/288 Series Parts List (HY25-2281-M1/US), 267/281/288/871/878 Series Owner's Manual, 281 Series Sales Literature, and Chelsea PTO Stud Kits (HY25-2002-M1_US). Applicable market segments include fire and rescue, refuse, truck cranes, and pumper-cleaner trucks.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
