air compressor problem

[Captn. J]

i have a 5.5 hp 30 gal craftsman oilless  electric  ,  anyhow my problem is it keep popping fuse or  having problem cranking then pop the fuse but it run just fine if i open the bottom drain open it will run just fine but not when i close it and it will fill the tank once then when its  time to refill  , it will try turn over but stalls or something  i imagine and pops the fuse    what must be my problem?

[Eroq]

do you have it wired for 110 or 220?

[scooterbob]

if it will run to pressure up then shuts off..but will not start back up unless pressure is released ...that tells me that your check valve on ur air tube into the tank from comp head is bad...its letting air the wrong way (out of the tank instead of only in)and its dead heading ur pump with air pressur that motor cant work against to restart then blows breaker....

[Eroq]

if it will run to pressure up then shuts off..put will not start back up unless pressure is realised ...that tells me that your chck valve on ur air tube into the tank from comp head is bad...its letting ait the wrong way and dead heading ur pump so the the cant work to restart

or pressure switch is bad or adjusted wrong  usually on at 90 off at 120  ~ 125

[cody08]

do u have it running off a extension cord

[Captn. J]

it does it either way on ext cord or without , so  shd i get a new switch? for the air comp?

[paul]

do u have it running off a extension cord

[paul]

idk i know they dont like extion cords for some reason. if its doing both then not sure less i was there.

do you have it wired for 110 or 220?

[xjs3667]

im curious to know the problem too  I have a little pancake compressor thats doing the same thing. It fills up once and it will try to to pump but cant untill I release pressure to below 5 psi.

[paul]

i want to know what it is to ive never heard of having to release pressure to gain it new one on me

[Captn. J]

i read  its either the pressure switch or the check valve   i m gonna check it tomorrow  and pinpoint it

[scooterbob]

take the cover off and take belt off...    if it still kicks out its an elec issue.... if it dont its the check valve... man i work on these all day long

my moneys on check valve

[xjs3667]

im guessing check valve on mine since it turns on when it needs to but just cant pump, so i have to turn it off before it blows the breaker.

has anyone changed a check valve in a compressor? I dont know much about them but im sure i can figure it out lol

good luck  Capt.    let us knw what you find

[scooterbob]

i want to know what it is to ive never heard of having to release pressure to gain it new one on me

when the tank is full there is more pressure in there then the pump makes at one time... so if chack valve fails all that pressure come back up the tube to the comp head.. and dead heads it...

so if u release pressur out of the tank it no longer has all that pressue on the comp head allowing it to start

[scooterbob]

im guessing check valve on mine since it turns on when it needs to but just cant pump, so i have to turn it off before it blows the breaker.

has anyone changed a check valve in a compressor? I dont know much about them but im sure i can figure it out lol

good luck  Capt.    let us knw what you find

pm ur number ill talk u through it its simple i do it all day... prob got one in stock for u if ur close that is

[Captn. J]

take the cover off and take belt off...    if it still kicks out its an elec issue.... if it dont its the check valve... man i work on these all day long

my moneys on check valve

there s a belt?

[xjs3667]

I dont think you have a belt on yours  I got another one just like yours and theres no belt

[Captn. J]

ok scooter bob  i sent u a pm     

[paul]

ohhhhhh ok gotcha thanks for the info

i want to know what it is to ive never heard of having to release pressure to gain it new one on me

when the tank is full there is more pressure in there then the pump makes at one time... so if chack valve fails all that pressure come back up the tube to the comp head.. and dead heads it...

so if u release pressur out of the tank it no longer has all that pressue on the comp head allowing it to start

[scooterbob]

should be... only a few of the bigger sears is direct drive.....if u have the one with the duel piston set up then no there is no belt.

u can also undo the air line from pump so it free pumps just to check... dont run it more then  couple min. like that