878XEFJP-M5AC Chelsea PTO Assembly

The Chelsea 878 Series Power Take-Off, part number 878XEFJP-M5AC or 878XEFJPM5AC, is a constant mesh PTO built to fit Allison and CAT 10-bolt transmissions. It carries a 670 lb-ft torque rating for both continuous and intermittent duty, making it one of the highest-rated units in its mounting class. The cast iron housing and ductile iron bearing cap, which is 117% stronger than gray iron, address the vibrational stresses produced by modern engine designs. An o-ring sealing configuration between the housing and bearing cap improves clamp load and reduces vibrational effects. Rotatable cast iron flanges reduce clearance and interference concerns, while the driveline output's positive stop feature eliminates oil seal damage from coupling. Nine speed ratios cover both low and high speed applications. Call us to confirm proper fit for your specific transmission and application.

Features

Constant mesh design with cast iron housing fits Allison and CAT 10-bolt transmissions
Ductile iron bearing cap rated 117% stronger than gray iron for added durability under vibration
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including both low and high speed ranges
Rotatable cast iron flanges reduce clearance and interference issues
Wet Spline Lubrication option extends shaft life 7 to 10 times compared to standard lubrication
Positive stop on driveline outputs eliminates oil seal damage from coupling
Hydraulic hose included, no separate order required

Tech Specs

• Mounting Type: 10-bolt (Allison and CAT transmissions)
• Shift Type: Constant mesh
• Continuous Torque Rating: 670 lb-ft (908 Nm) - check application pages for actual torque ratings
• Speed Ratios: Nine ratios including low and high speeds
• Output Shaft Options (series): SAE B (7/8 in. - 13T) pump spline, SAE BB (1 in. - 15T) pump spline, SAE C (1-1/4 in. - 14T) pump spline
• Output Flange Options (series): SAE B pump flange, SAE C pump flange, 1410 series companion flange
• Lubrication: Pressure lube (P) or wet spline (W) options available
• Continuous Operation: Yes

Additional Information

Parts Manual: Chelsea 878 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.