281GKFJP-B3BV Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off Assembly, part number 281GKFJP-B3BV or 281GKFJPB3BV, is a hydraulically shifted hot shift PTO designed for automatic transmissions with a 10-bolt aperture, commonly found on Allison transmissions. It mounts with a 10-bolt configuration and delivers continuous duty operation with a single continuous torque rating. The 281 Series is an evolution of the Chelsea 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration to improve clamp load, and an enhanced clutch pack with steel discs 80% thicker than the previous design. Nine speed ratios cover both low and high ranges. Electronic Overspeed Control (EOC) and the SmartStart feature are included to protect driven equipment and reduce shock at start-up. A genuine Chelsea part available from Pro Gear and Transmission. Call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot shift) operation for Allison 10-bolt automatic transmissions
Ductile iron bearing cap - 117% stronger than gray iron versus the predecessor 280 Series design
Enhanced clutch pack with steel discs 80% thicker 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 low and high speeds
Rotatable cast iron flanges reduce pump clearance interference
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Positive Stop for driveline outputs eliminates oil seal damage from coupling

Tech Specs

• Mounting Type: 10-Bolt
• Shift Type: PowerShift (Hydraulic) - Hot Shift
• Continuous Operation: Yes
• Transmission Compatibility: Allison automatic transmissions (10-bolt aperture)
• Speed Ratios: Nine (includes low and high speeds)
• Bearing Cap Material: Ductile Iron
• Lubrication Options: Pressure Lube (P) or Wet Spline (W)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline

Additional Information

The Chelsea 281 Series is suited for demanding markets including fire and rescue, refuse, pumper/cleaner, and truck crane applications. The series builds on the 280 Series platform with three structural upgrades: a ductile iron bearing cap, an o-ring sealed housing-to-bearing-cap interface, and an 80% thicker steel clutch pack. These changes directly address vibrational stress introduced by modern and future engine designs. Hose is included with the assembly - no separate order required. For parts list reference, see Parker document HY25-2281-M1/US (281/288 Series Parts List).

Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.