Cleaning the air filters and servicing the crankcase are the only maintenance services needed on an air
compressor. Some compressors may require additional lubrication in the oil cups, grease cups, or
for driving compressors because electric motors require very little maintenance.
b. Where electric power is not available, a gasoline engine-driven unit must be used. The
preventive maintenance services for a gasoline engine are similar to those for any gasoline engine. The
lubricating oil in the crankcase must be kept at the proper level. If it is low, add enough oil to bring the
level up to the full mark. In addition, the oil in the crankcase must be changed; and if the engine has an
oil filter, the filter cartridge is changed when the oil is renewed. You should also clean the air filter as
recommended by the manufacturer. Be sure to check the manufacturer's handbook or the applicable TO
for operating instructions and maintenance of the particular type of equipment that you have.
Figure 3-42. High-pressure air compressor (gasoline engine)