281GKFJP-B3RK Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off Assembly, part number 281GKFJP-B3RK or 281GKFJPB3RK, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison transmissions. It mounts with a 10-bolt configuration and is rated for continuous-duty operation. The 281 Series builds on the 280 Series platform with a ductile iron bearing cap that is 117% stronger than gray iron, an O-ring sealing configuration between the housing and bearing cap to improve clamp load, and an 80% thicker steel disc clutch pack to resist premature tooth wear. Nine speed ratios cover both low and high-speed applications. Rotatable cast-iron flanges reduce interference and improve pump clearance. Electronic Overspeed Control (EOC) protects downstream driven equipment. Call us to confirm proper fit for your transmission and application.

Features

10-bolt mounting aperture, designed for Allison automatic transmissions
Hydraulic PowerShift (hot-shift) operation for engagement under load
Ductile iron bearing cap, 117% stronger than gray iron
80% thicker steel discs in clutch pack to resist premature tooth wear
O-ring sealing between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high-speed options
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment
SmartStart reduces shock load at start-up for applicable configurations
Positive stop for driveline outputs eliminates oil seal damage from coupling
Hose included, no need to order separately

Tech Specs

• Mounting: 10-Bolt aperture
• Shift Type: Hydraulic PowerShift (hot-shift)
• Continuous Operation: Yes
• Compatible Transmission Manufacturer: Allison
• Continuous Torque (Series): 390 lb-ft / 529 Nm (verify actual rating for your application)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubricant Options: Pressure Lube (P), Wet Spline (W)
• Speed Ratios: Nine ratios, including low and high speeds
• Output Shaft Options: SmartStart Round Shaft (1-1/4 in. - 5/16 in. Key), 3/4 in. - 11T Pump Spline, SAE B (7/8 in. - 13T) Pump Spline, SAE C (1-1/4 in. - 14T) Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange
• Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM (series rating)
• Typical Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse

Additional Information

The 281 Series is an evolution of the Chelsea 280 Series PTO, incorporating a redesigned bearing cap, upgraded clutch pack, and improved sealing to address vibrational effects from modern engine designs. Relevant service documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual, available from Parker Chelsea.

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