Hyundai 110D-9 Manual page 211

30) CLEANING TRANSMISSION AIR BREATHER
(1) Remove dust or debris around the air breather.
(2) Remove the air breather and wash it with a
cleaning oil.
31) CHECK AND SUPPLYING AXLE OIL
(1) Move the truck to flat ground.
(2) Open the axle air breather to relieve internal air
pressure.
(3) Remove the plug and check the oil amount.
If the oil level is at the hole of the plug, it is
normal.
Differential gear
level plug
7-42
Air breather
Air breather
Fill & oil
110D9MI45
110D9MI46
110D9MI47