281GDFJP-D8RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off Assembly, part number 281GDFJP-D8RK or 281GDFJPD8RK, is a hydraulically shifted (PowerShift) hot-shift PTO designed 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 steel clutch pack discs increased 80% in thickness to resist premature wear. The series supports continuous operation, offers nine speed ratios, and is suited for demanding vocations including fire and rescue, refuse, pumper/cleaner, and truck crane applications. Call us to confirm proper fit for your transmission and application.

Features

Hydraulic PowerShift (hot-shift) operation for automatic transmissions
10-bolt mounting aperture, compatible with Allison transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap improves clamp load and reduces vibrational effects
Steel clutch pack discs 80% thicker than prior design to resist premature tooth wear
Nine available speed ratios including low and high-speed options

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: Hydraulic PowerShift (hot-shift)
• Transmission Compatibility: Allison automatic transmissions
• Continuous Operation: Yes
• Bearing Cap Material: Ductile Iron
• Series: Chelsea 281 Series (evolution of 280 Series)

Additional Information

The Chelsea 281 Series PTO is an evolution of the earlier 280 Series and is engineered specifically to address vibrational stresses from modern engine designs. Upgrades versus the 280 Series include a ductile iron bearing cap (117% stronger), an improved o-ring sealing configuration for better clamp load, and an 80% increase in steel disc thickness within the clutch pack. The series also supports an optional wet spline lubrication configuration for extended shaft life, a SmartStart feature to reduce shock load at start-up, and Electronic Overspeed Control (EOC) to protect driven equipment. Rotatable cast iron flanges provide improved pump clearance. Common vocational markets include fire and rescue, refuse, truck cranes, and pumper/cleaner trucks. Part number 281GDFJP-D8RK is also referenced as SP281GDFJP-D8RK in some catalogs. Relevant Parker Chelsea documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.