In this paper, the present situation of maintenance for heavy duty caterpillar engines was introduced. Based on the maintenance shortcoming of heavy duty caterpillar engines, the remanufacturing technology of armored equipment engines was put forward and discussed preliminary. And the difference between remanufacturing and maintenance for equipment diesel engines are summarized. Then new and novel remanufacturing technology was studied and applied on the engine key parts to prolong its service life. After the application of remanufacturing technology, many worn and waste parts can be reused which can save a lot of resource for our nation. It meet the needs of development tactic requirement for saving resource and decrease contamination emissions.