Features
Hydraulic hot-shift (PowerShift) operation for 10-bolt automatic transmission apertures, including Allison
Ductile iron bearing cap rated 117% stronger than gray iron
80% thicker steel discs in the clutch pack to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios, including both low and high speed ranges
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart option reduces shock load at start-up
Wet spline lubrication option provides 7 to 10 times greater shaft life
Rotatable cast-iron flanges reduce pump clearance interference; positive stop for driveline outputs eliminates oil seal damage
Tech Specs
- Mounting Type: 10-Bolt aperture (Allison and Caterpillar automatic transmissions)
- Shift Type: PowerShift (Hydraulic hot-shift)
- Continuous Torque: 390 lb-ft (529 Nm)
- Speed Ratios: Nine, including low and high speeds
- Output Types: SAE B pump flange, SAE C pump flange, ISO 7652 pump flange, driveline
- Output Shaft Options: 3/4" 11-tooth pump spline, SAE B 7/8" 13-tooth pump spline, SAE C 1-1/4" 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, SmartStart round shaft (1-1/4" with 5/16" key)
- Lubrication: Pressure lube or wet spline option
- Continuous Operation: Yes
- Cross Reference: 280GSFJP-B8XD or 280GSFJPB8XD
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series platform, developed for fire and rescue, truck cranes, pumper cleaner, and refuse applications that demand reliable continuous-duty PTO operation. The 281GSFJP-B8XD is also referenced as 280GSFJP-B8XD, 280GSFJP B8XD, and 280GSFJPB8XD. Parker Chelsea publishes a dedicated parts list (HY25-2281-M1/US) and an owner's manual covering the 267, 281, 288, 871, and 878 Series for detailed service reference.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
