Features
Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmissions including Allison and Caterpillar
Ductile iron bearing cap is 117% stronger than gray iron for increased durability under high-vibration engine loads
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibrational effects
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios including low and high speeds; single continuous-duty torque rating
Wet Spline Lubrication option provides 7 to 10 times greater shaft life; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Shift Type: Hydraulic PowerShift (hot-shift)
- Mounting: 10-bolt aperture
- Compatible Transmissions: Allison and Caterpillar automatic transmissions
- Continuous Torque Rating: 390 lb-ft (529 Nm) - verify actual rating on application pages
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine, including low and high
- Lubrication: Pressure Lube (P) or Wet Spline (W) option
- Cross-References: 280GDFJP-B8XD or 280GDFJPB8XD; also referenced as 5P1491, 5P1479
Additional Information
The Chelsea 281 Series targets demanding markets including Fire and Rescue, Refuse, Truck Cranes, and Pumper Cleaner applications. SmartStart technology reduces shock load at start-up for select applications. The Positive Stop feature on driveline outputs eliminates oil seal damage from coupling. Rotatable cast-iron flanges reduce interference issues with pump clearance. Parker Chelsea documentation for this series includes 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.
