Features
10-Bolt mounting aperture, compatible with Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) operation for engagement under load
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with steel discs 80% thicker to resist premature tooth wear
O-ring seal between housing and bearing cap reduces vibration effects and improves clamp load
Nine speed ratios including low and high speeds; Wet Spline Lubrication option for 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
- Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1,000 RPM
- Speed Ratios: Nine, including low and high speeds
- Lubrication Options: Pressure Lube (P) or Wet Spline (W)
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Continuous Operation: Yes
Additional Information
The Chelsea 281 Series is covered by the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Typical markets include fire and rescue, refuse haulers, truck cranes, and pumper-cleaner vehicles. Rotatable cast-iron flanges reduce interference issues with pump clearance, and the Positive Stop feature for driveline outputs eliminates oil seal damage from coupling contact. Electronic Overspeed Control (EOC) is available to protect driven equipment from overspeed damage.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
