Question about Air Tools & Compressors
After pressure builds up & it shuts off, I can hear air hissing from the intake which makes it come back right back on about three minutes after it shut off. What kind of valve keeps it in the tank after the motor puts it there?
Sounds like bad reed valves in head, some older units had a in line check valve, I know they can also be added
Posted on Jan 10, 2015
You will probably have reed valves inside the head. One may be bent or broken or you may have simply blow a head gasket which is easy to fix. just google reed valves in a air compressor and you will see the setup.
You will need to take the head off which will be 6 or 8 bolts and have a look.Not hard If it is a gasket it will only cost you $30 or $40 for a kit.
Posted on May 26, 2014
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Posted on Jan 02, 2017
It could very well be the valve plate however before you order parts take a look at the cylinders. Unplug the unit, remove the cover from crank side and turn the compressor by hand till the/a piston is at top of stroke. Examine upper cylinder for scratches /wear or failed vinyl piston ring. On oil-free compressors, dirt and grit is sucked-in from the bottom of the cylinder and causes leaks between cylinder wall and piston. If scratched, air pressure is leaking down thru cylinder wall. Failed reed valves cause a pulsation at the intake port (air seems to be pumped out the intake). If you see a model number anywhere on the pump that begins with " WL", your pump is made by Campbell Hausfeld. Parts can be ordered from www.chpower.com. other-wise order parts from sears parts. Cylinder kits are around $40. Good Luck on the repair and email if you have questions.
Posted on Apr 02, 2009
Maurader1 an apprentice has this problem solved and is spot on. All these gurus and wiz need to stick to the basic and common sense. The first place your pump will give out after use or abuse is the gasket. All this garbage about defective reeds and defective pressure switch is a lot of nonesense if you first don't rule out the most common problem the head gasket. I'm cheap and this thing has paid for itself 10 time over. You can get a gasket kit for $7, but I fabricated a gasket out of the back of my notebook and sprayed some gasket spray and been working like a charm ever since.
Posted on Jan 04, 2010
It sounds as though your unloader valve is stuck or broken. I would try and repair it but otherwise you will have to bite the bullet and get a new switch assembly I think. As you have just been working on the tank it might just be a bit of debris dislodged and stuck in the unloader valve. The unloader should only hiss just after switch off weather by automatic shut off or by manual shut down.
Posted on Jun 06, 2010
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