It is very important to check your gearbox oil on your power barrow, both when the machine is new and regularly through its life. Note the picture the left shows the gearbox oil level bung. Oil should just dribble out slowly if correct.
If you need to add oil remove one of the filler caps on the top of the gearbox you can see them bellow the gear stick (two the large black bolt) Add the oil slowly until it runs out of the level bung.
Always have your tracked dumper on level ground when your check your oil level.
The MD350/GX mini dumpers use 1.5L of EP80/90