[Shop-talk] Compressor woos

[Mike Sinclair]

If the motor is "humming" without starting, it is likely unable to 
overcome the existing pressure.  Bleeding down as Jimmie wrote will ease 
the load.  Do you have a long extension cord to the compressor?  This 
will increase the load considerably, and trip the breaker.

Mike

On 8/10/2021 7:32 AM, Jimmie Mayfield wrote:
> On 8/10/21 09:23, John T. Blair wrote:
>>
>> compressor went to cut on, but it didn't start.  I could hear a 
>> humming.  I
>> run over the the compressor, but before I can turn it off, it trips 
>> the new
>> breaker. 
>
>
> Try the following:
>
> 1. Turn the compressor off
> 2. Bleed off the pressure in the tank down to, say, 30-40psi
> 3. Turn the compressor on.
>
> What happens?  Does it start?
>
> Sounds like your unloader valve might be going bad though since you 
> have a bonafide 5hp motor, I'm a little surprised it can't power 
> through it.  What size circuit do you have it on?  30A?
>
>
>
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