919.19512 - what will help my compressor

by tom bridges
(Asheville ,NC )

bill I have a craftsman model 919.19512 that is a pice of crap i will never buy from sears again.


i am rebuilding it now new motor, pressure switch, .what can i do to help take the load of the motor ? will a magnetic stater help or a load GENIE.ARE there better parts from GRANGER/northern tool. thanks for any advice .

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Bill says...

Hi Tom. I would agree that the quality of low-end air compressors available today is inferior to years ago, but then, years ago, there were far fewer "cheapie" air compressors. Essentially, today, we get what we pay for... in fact, that's a truism for all things I suspect.

If the compressor is working properly, the compressor has been designed to handle the expect loading that the motor will see as the pump puts air into the tank and the back pressure increases.

So, when you say "what can i do to help take the load of the motor ?" I'm not quite sure what you mean?

Does this mean you want the motor able to handle a bigger load? Then a larger HP motor will do that.

Does this mean that you want the load to be less when the compressor starts up? Making sure your unloader valve is working properly will do this.

Any more details would be welcome as a comment here.

Cheers,

Bill



Comments for 919.19512 - what will help my compressor

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Jan 19, 2012
how big can you run
by: Anonymous

ON my how shop i have a 200 amp service .what is the best way to run a 2 stage compressors that has a 3 phase motors.what types are more efficient/screw/rotary/piston? can it be done with a phase converter?I don't have a big compressors but i find them sometimes at plant auctions.thanks bill

Jan 17, 2012
thanks bill
by: Anonymous

I do thank you for taking the time to help all the folks with compressor problems ,if i had my choice and some money I would buy a atlas copco ,or a Quincy.if you ever need parts for A-C tell me what to look for and i will tyr to find it.

Jan 16, 2012
adding a magnetic starter
by: Anonymous

Bill I am replacing the CHEEP GE/regal beloit 1.8 HP motor that came on it with a baldor motor that has the same spes .and a new PRESSURE SWITCH .I don't wont to change what the compressor is made to do just decrees the start up load on the motor .will a magnetic starter help do that?or will a load genie help. thanks for all your knowledge.

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As a general rule, I advise against changing the factory settings for cut in and cut out on compressors, as they are built to handle those pressure levels. If you really want to change the cut in pressure, that is done with the pressure switch settings. See the pages on Pressure Switches for more info.

The load Genie simply adds another unloader valve which is probably redundant, as your compressor already has one.

The start capacitor that comes with the motor should be all the help the motor needs to start. Yet, if you want to play with improving things... press on. It were my compressor, I wouldn't.


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3 h.p. 20 gal. sears compressor pump will not run with air in tank

by brian
(louisiana)

I have a 3 h.p. 20 gal. sears compressor that will run fine when tank is empty. After it pressures up and use the air, it kicks back on but pump will not turn over. I can bleed the tank and works fine again. Could the proplem be a check valve or pressure valve?
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Probably neither, Brian.

What I suspect is your unloader valve isn't doing its job. Please see the Unloader Valve page for details. Check that out, and let me know if that solves the problem, will you?

Cheers,

Bill

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