Which sub-assemblies of the bus are lubricated with gear oil?
Show the correct answer
Correct answer
B. The gear box.
Explanation
In the photo, you can see the open engine compartment at the rear of a bus. Gear oil is used to lubricate the gearbox - answer B.
The Road Traffic Act requires a vehicle to be maintained so that using it does not endanger safety. Gear oil is thicker and resists the very high pressures that occur between the teeth of gear wheels, which is why it is used in the gearbox and in the drive axle. The engine (answer A) is lubricated with engine oil, which must work at high temperature and clean carbon deposits from the engine. Pins and joints (answer C) are lubricated with grease pressed in through grease nipples. Mixing up the oils, for example pouring gear oil into the engine, can lead to a serious breakdown, which is why you always check the manufacturer's recommendations.
Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)