GMC, reduction gear oil change in Zevulun

GMC, reduction gear oil change in Zevulun.
It is recommended to change the reduction gear oil every 100 thousand operational kilometers. However, it must be changed more often in difficult operating conditions. To change the oil, it is necessary to remove the crankcase guard and to clean the reduction gear of dirt and corrosion. Then a container is installed under the drain hole, the drain plug is unscrewed and the old oil is drained. After that, it is required to rinse the reduction gear by filling in a special agent. Finally, the drain is closed and fresh oil is refilled.