![]() Other issues with this 21 gallon compressorĪt around $150 in early 2020, the Harbor Freight 21 gallon air compressor with the 2.5 HP electric motor is a reasonable do-it-yourself type of air compressor with ideal use being tools that require bursts of air rather than sustained air supply.Įnsure that the air tools being used have an air demand below the approximately 4 CFM at 90 PSI this compressor promises. Not so good if moving up and down stairs, however. While it weighs in pretty close to 100 lbs, it’s fairly easy to move this compressor around on level surfaces as it comes equipped with two wheels for wheeling around, and a handle to make this process easier. Portability of the Harbor Freight 21 gallon compressor Automotive oil, though it may have a similar viscosity, contains detergents that are not suitable for the compressor. Excessive oil use may indicate a failed piston seal.Īlso ensure that the only oil used to lubricate this compressor pump is compressor lube oil. Oil often ends up in the tank or in the air lines depending on how much bypasses the piston seals. Fill the oil to the center of the dot in the sight glass, and monitor it regularly as oil will be consumed as the compressor is run. There is an oil fill port on the top of the end of the pump housing along with an oil-fill sight gauge at the bottom of the pump housing. It will not normally be shipped from the factory with oil in it, so make sure that compressor lube oil is added before it is used. This compressor needs oil as it is splashed lubed. ![]() Under load or when it’s cool, it may be hard to get this compressor to start when powered by a 15 amp circuit, particularly if there are any other electrical appliances in use on the same power supply. That seems a bit low, as, according to, a 115 volts motor – single-phase requires 14 amps per HP. When the 21 gallon compressor is running it needs 14 amps of power supply according to Harbor Freight. ![]() Doing so will reduce your operating costs both in terms of energy consumed to do the work, and help your compressor last longer due to it not cycling on as often as if pressure was being used at maximum output all the time. Consider using the regulator that comes with this compressor to reduce the output pressure from that 125 PSI down to the minimum pressure your air tools need to operate properly. This compressor has a maximum output pressure of 125 PSI. Other issues with this 21 gallon compressor.Portability of the Harbor Freight 21 gallon compressor. ![]()
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