740 EJ Model (3T7 Series) Maintenance Guide: Key Intervals & Parts List

As a reliable workhorse in heavy-duty operations, the long-term performance of the 740 EJ model (3T7 Series) relies on regular and standardized maintenance. Below is a simplified breakdown of core maintenance intervals and corresponding parts to help you accurately manage service nodes and extend equipment lifespan:

At 4,000 operating hours, replace 212 liters of  HYDO TO10 oil to provide continuous lubrication protection for the hydraulic system.

At 5,000 hours, focus on replacing the 378-3178 Diesel Exhaust Fluid (DEF) filter element to ensure efficient operation of the exhaust treatment system.

The 6,000-hour maintenance requires completing multiple key tasks simultaneously: replace 90 liters of ELC coolant and 73 ounces (2.15 liters) of coolant extender, paired with 2 units of 248-5513 thermostats (including 341-1429 gaskets) to maintain stable performance of the cooling system.

at 10,000 hours,Replace the 5,06-5818 Diesel Exhaust Fluid (DEF) manifold filter element.

Every 3 years, regularly replace the 566-5659 cab safety belt to ensure operational safety. At 

12,000 hours, replace 90 liters of ELC coolant and the corresponding extender again to sustain cooling system efficiency.

Adhere to the above maintenance standards to keep your 740 EJ model in optimal working condition, reduce failure risks, and enhance construction efficiency!