The Chelsea 281 Series Power Take-Off, part number 281GMFJP-S8RK or 281GMFJPS8RK, is a hydraulically shifted hot shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison transmissions. The 281 Series builds on the proven 280 Series platform with a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap for improved clamp load, and an enhanced clutch pack featuring 80% thicker steel discs to resist premature tooth wear. The series carries a continuous torque rating of 390 lb-ft (529 Nm) and offers nine speed ratios spanning low and high ranges. Rotatable cast-iron flanges reduce interference fitment issues, and a Wet Spline Lubrication option extends shaft life by 7 to 10 times. Electronic Overspeed Control (EOC) protects driven equipment, while the SmartStart feature reduces shock load at start-up on compatible applications. Call us to confirm proper fit for your transmission and application.
The Chelsea 281 Series is suited for demanding vocational markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Part number 281GMFJP-S8RK carries the ratio designation 35/40 within the 281 Series lineup. A hose is included with this assembly, eliminating the need for a separate order. The Positive Stop feature on driveline outputs prevents oil seal damage from coupling contact. Refer to Parker Chelsea documents 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for full application and installation detail.
Features
Hydraulic PowerShift (hot shift) operation for Allison 10-bolt aperture transmissions
Ductile iron bearing cap, 117% stronger than gray iron
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap for improved clamp load
Nine speed ratios including low and high speeds
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) and SmartStart shock-load reduction included
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Compatible Transmissions: Allison automatic transmissions
- 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
- Lubrication Options: Pressure Lube (P), Wet Spline (W)
- Electronic Overspeed Control (EOC): Included
- SmartStart: Available for applicable configurations
- Continuous Operation: Yes
Additional Information
The Chelsea 281 Series is suited for demanding vocational markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. Part number 281GMFJP-S8RK carries the ratio designation 35/40 within the 281 Series lineup. A hose is included with this assembly, eliminating the need for a separate order. The Positive Stop feature on driveline outputs prevents oil seal damage from coupling contact. Refer to Parker Chelsea documents 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual for full application and installation detail.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
