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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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<p><font face="Tahoma">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.</font></p>
<p><font face="Tahoma">Mike</font><br>
</p>
<div class="moz-cite-prefix">On 8/10/2021 7:32 AM, Jimmie Mayfield
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:0fd32c48-1002-34ba-2b3e-938e4c7ff013@sackheads.org">On
8/10/21 09:23, John T. Blair wrote:
<br>
<blockquote type="cite">
<br>
compressor went to cut on, but it didn't start. I could hear a
humming. I
<br>
run over the the compressor, but before I can turn it off, it
trips the new
<br>
breaker. </blockquote>
<br>
<br>
Try the following:
<br>
<br>
1. Turn the compressor off
<br>
2. Bleed off the pressure in the tank down to, say, 30-40psi
<br>
3. Turn the compressor on.
<br>
<br>
What happens? Does it start?
<br>
<br>
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?
<br>
<br>
<br>
<br>
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