878XAFJP-M5AC Chelsea PTO Assembly

The Chelsea 878 Series Power Take-Off Assembly, part number 878XAFJP-M5AC or 878XAFJPM5AC, is a constant mesh PTO engineered for Allison and CAT 10-bolt transmission mounting. The 878 Series delivers up to 670 lb-ft of torque in a compact package, with a single continuous duty torque rating that simplifies application planning. A ductile iron bearing cap provides 117% greater strength compared to gray iron, and an O-ring sealing configuration between the housing and bearing cap improves clamp load and reduces vibration-related wear. Nine speed ratios cover both low and high speed needs. Rotatable cast-iron flanges reduce clearance interference, and a Positive Stop design on driveline outputs eliminates oil seal damage from coupling contact. A hose is included with the assembly. Call us to confirm proper fit for your specific transmission configuration.

Features

Constant mesh design with cast iron housing fits Allison and CAT 10-bolt transmissions
Ductile iron bearing cap is 117% stronger than gray iron for reduced vibrational damage
O-ring sealing configuration between housing and bearing cap improves clamp load
Nine speed ratios available, spanning both low and high speed ranges
Rotatable cast-iron flanges reduce clearance interference at installation
Positive Stop driveline output prevents oil seal damage; hose included with assembly

Tech Specs

• Transmission Mounting: Allison and CAT 10-Bolt
• Shift Type: Constant Mesh
• Continuous Torque Rating: 670 lb-ft (908 Nm) - check application pages for actual rating
• Output Shaft Options: SAE B (7/8 in. - 13T) Pump Spline, SAE BB (1 in. - 15T) Pump Spline, SAE C (1-1/4 in. - 14T) Pump Spline, DIN 5462 Pump Spline, 1410 Series Companion Flange, DIN 120 Flange, DIN 100 Flange
• Output Flange Options: SAE B Pump Flange, SAE C Pump Flange
• Lubrication: Pressure Lube or Wet Spline options available
• Wet Spline Lubrication: Extends shaft life 7 to 10 times compared to standard
• Continuous Operation: Yes
• Series: Chelsea 878

Additional Information

Parts manual and diagrams: Chelsea 878 Series PTO parts list with prices