Features
Ductile iron bearing cap, 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Enhanced clutch pack with steel discs 80% thicker than the predecessor 280 Series design
Nine speed ratios including low and high speeds
Rotatable cast iron flanges reduce interference clearance issues at the pump
Positive Stop for driveline outputs eliminates oil seal damage from coupling
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up for certain applications
Electronic Overspeed Control (EOC) protects driven equipment
Hose included, no separate order required
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) Hot Shift
- Compatible Transmission Type: Automatic (Allison)
- Continuous Torque: 390 lb-ft (529 Nm) -- verify actual rating on application pages
- Intermittent Torque Range: 301-400 lb-ft (501+ Nm)
- 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)
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: 1-1/4" round shaft with 5/16" key (SmartStart), 3/4"-11T pump spline, SAE B 7/8"-13T pump spline, SAE C 1-1/4"-14T pump spline, DIN 5462 pump spline, 1410 companion flange, DIN 120 flange, DIN 100 flange
- Lubrication: Pressure Lube (P) or Wet Spline (W) option
- Continuous Operation: Yes
- Speed Ratios: Nine, including low and high speeds
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
Reference Documents: 281/288 Series Parts List (HY25-2281-M1/US); 267/281/288/871/878 Series Owner's Manual; 281 Series Sales Literature; Chelsea PTO Stud Kits (HY25-2002-M1_US).
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
