Features
Hydraulic PowerShift (hot-shift) operation for engagement under load on automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap to improve clamp load and reduce vibrational effects
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
Positive Stop for driveline outputs eliminates oil seal damage from coupling
SmartStart reduces shock load at start-up for select applications
Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt aperture (Allison and Caterpillar automatic transmissions)
- Shift Type: Hydraulic PowerShift (hot-shift)
- Continuous Torque: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Continuous Operation: Yes
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: SmartStart Round Shaft (1-1/4" - 5/16" Key), 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
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Lubricant Options: Pressure Lube (P) or Wet Spline (W)
- Series: Chelsea 281 Series (evolution of the 280 Series)
Additional Information
The Chelsea 281 Series is suited for demanding vocational markets including fire and rescue, truck cranes, pumper cleaner, and refuse applications. Relevant Parker Chelsea documentation includes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. The series also covers related technical notices PTO-PNI-292 for the 281, 288, 871, and 878 Series.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
