Features
Hydraulic (PowerShift) hot-shift operation for automatic transmissions with 10-bolt aperture
Ductile iron bearing cap, 117% stronger than gray iron for increased durability
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Nine speed ratios including dedicated low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Rotatable cast iron flanges reduce interference and improve pump clearance
SmartStart feature reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) Hot Shift
- Compatible Transmission Type: Automatic (Allison, Caterpillar 10-bolt aperture)
- Continuous Operation: Yes
- Series Continuous Torque Rating: 390 lb-ft (529 Nm) - see application pages for actual ratings
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Speed Ratios: Nine (including low and high)
- Lubrication Options: Pressure Lube, Wet Spline
- Series: Chelsea 281
Additional Information
Applicable Parker Chelsea documents: 281/288 Series Parts List (HY25-2281-M1/US); 267/281/288/871/878 Series Owner's Manual; Chelsea PTO Stud Kits (HY25-2002-M1_US). Markets served include fire and rescue, refuse collection, truck cranes, and pumper/cleaner vehicles. Part number also referenced as SP281GSFJP-B3RY in some catalog listings. NMFC class 125820 (Hydraulic PTOs, Pumps, Motors).
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
