Hitachi EC12 Compressor- weird hum
5 year old compressor, light duty use, less than 200 hours.
Now unit builds pressure, gauge of right side building fast, the one on the left slowly. When it reaches a certain pressure say 120, the unit suddenly blows off a burst of air.
After the burst of air, a weird electrical humm is heard for about 10 seconds, which stops.
Any suggestions?
Now unit builds pressure, gauge of right side building fast, the one on the left slowly. When it reaches a certain pressure say 120, the unit suddenly blows off a burst of air.
After the burst of air, a weird electrical humm is heard for about 10 seconds, which stops.
Any suggestions?
Air Tools & Compressors - Hitachi - EC12 Portable Electric 2hp Air Compressor, Oil Lubricated
Answers & Comments
The burst of air you hear as the compressor shuts off is the cylinder unloading so it will not have to restart against a high pressure load. If the unloader is electrical it would explain the hum that you hear. This could be a normal function.