Question about Craftsman Air Tools & Compressors
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Posted on Jan 02, 2017
Usually you cannot adjust the cut out pressure of the tank/motor itself, this is why they have regulators, which regulates the pressure flowing down the air lines (regulators like these dont regulate actual tank pressure cutout). To regulate air flow using the regulator knob, you actually have to have air flowing through the hose while you make the regulator/pressure adjustments as regulators regulate pressure DOWNSTREAM from the actual regulator itself.. so air flowing through is a must. Attach an air blower or something similar and let air start flowing through the hose. Now turn your regulator knob in the "-" direction to decrease regulated pressure. It is best to bring pressure all the way down to "0" first, then open the regulator up (by turning to the "+" side) and pressure will rise until you get to the desired pressure needed for the air tool in use. The tank pressure will still be between 80-125 PSI as the motor regulates and keeps the pressure in the tank between these values automatically, but your line/hose air flow pressure will remain at the regulated pressure (say 40 PSI or whatever you set using the regulator knob).
Hope that helps and makes sense.
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Posted on Jun 20, 2009
SOURCE: Hitachi twin stack problem.
You stated that the compressor started up fine. I'll assume it reached it's max psi then cut out. Then upon reaching it's cut-in psi the motor ran slowly for a few seconds, then kicked off. I also assume you mean check valve when you refer to the non return valve.
If this sounds about right then. The first thing I would do is bleed out all the air from both the tank and the pump supply line leading from the pump head to the tank's check valve. You can do this by simply loosening the fitting that attaches the line at the head or the check valve. Once done try running the compressor again.
The purpose of this is to check the unloader valve. This valve bleeds off the pressure that remains in the compression cylinder and the supply line up to the check valve. When functioning normaly it will bleed off this pressure once the motor shuts off. If it is not working correctly then when your compressor starts back up (once it is already been filled) the piston will be working against a psi close to the max psi.
If the problem reoccurs only after the compressor has reached it's max psi, then the unloader valve is most likely the problem. If however it will not start up at all even after a complete bleed then it has to be something internal to the pump and\or motor.
Please try this and let me know (or repost) your findings.
If it's the unloader valve I should be able to explain how to repair this valve.
Posted on Aug 12, 2009
Testimonial: "Good info"
the velves are called "reed velves" look from under the head at the velve block as if you were the piston, as the piston gos down it pulls (open)the inlet velve (but the out let velve is held closed by spring presher) and on the way up it (pushes closed on the inlet velve) and pushes the out let velve open so air can be pushed into the air tank,,,has this helped you? they are held in place by light spring presher and maybe fasend by a bolt?
Posted on Oct 25, 2009
You didn't give any details about the model compressor you have. As far as a manual goes I'm not sure if that would help. Unless this has changed recently Mastercaft has only one generic manual for all their compressors.Yea I know, lame.
However if you follow the link I provided you should be able to get the spec's for it. It's Canadian Tire and there is three pages of compressors. Find yours, click on it and on that page you will find a specifications tab for it.
If you need more info I think you will have to contact Canadian Tire support and request it from them.
Hope this helps.
Posted on Dec 04, 2009
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