Final answer:
In trucks with air compressors that have their own oil supply, the oil level should be checked regularly to ensure proper functioning. The first check should be done before initial use.
Step-by-step explanation:
In trucks with air compressors that have their own oil supply, the oil level should be checked regularly to ensure proper lubrication and functioning of the compressor. The first time you should check the oil level is before the initial use of the air compressor. This is important because it allows you to verify that the compressor is properly filled with oil and ready for operation.
To check the oil level, locate the oil dipstick or sight glass on the air compressor. Remove the dipstick or check the oil level in the sight glass and compare it to the recommended level indicated by the manufacturer. Add oil if necessary to bring the level up to the recommended mark.
Regularly checking the oil level in the air compressor ensures its longevity and performance. Depending on the manufacturer's recommendation, it is advisable to check the oil level daily or at specified intervals to ensure that the air compressor remains properly lubricated.