Question about Craftsman Air Tools & Compressors
Actually this valves opens when the compressor shuts off.The pressure switch (which is activated by the larger air line attached to the tank)has a lever that opens this small valve to bleed the air from the compressor so that when it restarts it doesn't start against the tank pressure. The switch is probably working as intended, as it is venting as it should. Most likely the check valve at the tank is not sealing, allowing the air to escape from the tank through the valve attached to the pressure switch.
Posted on Oct 09, 2010
Remove the small tube and clean both the ends and shoot some cleaner (WD-40 or similar) down the tube. Reassemble. Make sure it it tight but don't strip or break it. There is a special tubing wrench available to properly tighten these brass connections. If you are careful, you can get by without using that special wrench.
What is happening: This tube you are working with supplies real time pressure to the control switch. When the pressure is down, the spring relaxes and allows the contacts to close energizing the motor. When the pressure reaches a predetermined setting, the spring compresses and opens the contacts turning off the motor. Any leak in your system will of course allow the bleeding off of pressure and will thus turn on the motor.
I hope this helps you with your leak. Thanks for using FixYa.com
Posted on Oct 08, 2010
There is a rubber seal at the base of that valve that is likely worn.
Disperse pressure before working on it.
What is the model #?
Should be something like xxx . xxxxx
Posted on Oct 08, 2010
Hi Michael. Thanks for choosing fixya! That needle valve may just need a little lubrication. Get a can of WD-40 and squiirt a little on the valve. Move the needle up and down as you squirt it. Repeat as needed. IF this does not do it, you will have to replace the valve. It is available at searspartsdirect.com
Please give my answer 4 thumbs up. Thanks. Joe
Posted on Oct 06, 2010
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Posted on Jan 02, 2017
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