878XEFJW-M5RS Chelsea PTO Assembly

The Chelsea 878XEFJW-M5RS or 878XEFJWM5RS is a constant mesh Power Take-Off assembly from the 878 Series, engineered to fit Allison and CAT 10-bolt transmissions. The 878 Series delivers up to 670 lb-ft of torque in a compact package, with a single continuous duty torque rating that eliminates the guesswork of intermittent vs. continuous applications. The ductile iron bearing cap is 117% stronger than gray iron, and an O-ring sealing configuration between the housing and bearing cap reduces vibrational effects and improves clamp load. Nine available speed ratios cover low and high speed requirements. Rotatable cast-iron flanges reduce interference clearance issues, and the optional Wet Spline Lubrication configuration extends output shaft life by 7 to 10 times. A hose is included. Call us to confirm proper fit for your specific transmission and application.

Features

Constant mesh design with cast iron housing for Allison and CAT 10-bolt transmission mounting
Ductile iron bearing cap rated 117% stronger than gray iron predecessors
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Single continuous duty torque rating up to 670 lb-ft, eliminating separate intermittent vs. continuous ratings
Nine speed ratios available, including low and high speeds
Rotatable cast-iron flanges reduce interference clearance issues at driveline outputs
Wet Spline Lubrication option extends output shaft life 7 to 10 times; hose included

Tech Specs

• Transmission Mounting: Allison and CAT 10-Bolt
• Shift Type: Constant Mesh
• Continuous Torque Rating: up to 670 lb-ft (908 Nm) - check application pages for actual torque ratings
• 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
• Continuous Operation: Yes
• Speed Ratios: Nine, including low and high speeds
• Hose: Included

Additional Information

The 878 Series is Chelsea's advancement of the proven 877 Series PTO platform. Improvements include an 80% increase in steel disc thickness within the clutch pack, a ductile iron bearing cap replacing the earlier gray iron design, and an upgraded O-ring seal configuration at the housing-to-bearing-cap interface. These changes directly address vibrational loads from modern and future engine designs. The 878 Series suits demanding vocational applications including snow and ice control, vacuum trucks, aerial work platforms, and refuse vehicles. Parker documents available for this series include the 267/281/288/871/878 Series Owner's Manual and the 878 Series Parts List (HY25-2871-M1/US).

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