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I work on a pentax .8hp motor withe smart HD. Psi reaching 50 dropping to 20psi and pump would not cut back in. I check the system for leaks and found none. All checks valves are good.

My details and checks are already stated.

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SOURCE: Craftsman 5 hp 30 Gal Won't build to more than 50/60 PSi

Most oilless compressors suffer from a short lifespan of the cylinder and piston ring. Unplug the unit and remove the cover to expose the cylinder and rod. Move piston to topmost position and examine the condition of the cylinder. If you see scratches or worn areas close to the top of the cyl. then most likely will need rebuild kit. (Not expensive) If cylinder looks good, remove the head and check the reed valves for debris or broken reed. Reed valve plate is also available as part with gaskets. To extend the life of an oilless compressor try not to use it in dusty or sandy areas as the bottom of the unit is open and tends to **** dirt into cylinder. Good Luck.

Posted on Dec 31, 2008

emissionwiz
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SOURCE: low fuel pressure 95 volvo 940 turbo

fuel pump check valve doesn't cause pressure loss, just hard starting cold, the check valve is part of the fuel pump, so to replace the valve u must replace the pump. do not use anything but the orig style pump, here is the part number from THE OE PUMP MAKER AT www.rockauto.com
DELPHI Part # FE0071 PRICE $124.99

Posted on May 05, 2009

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SOURCE: Cabin pump, primed fine only goes to28psi and keeps running

Sounds like the injector nozzle is plugged. This nozzle is directly inside the influent line on single line jets and down in the well on two-line jets. I'm assuming you have it primed correctly. If this happened suddenly the it'd definitely the injector nozzle. It it was a gradual process over time then I would say it's either a badly worn nozzle or worn impeller.

Posted on Sep 08, 2009

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SOURCE: Hitachi EC 12 Air Compressor does not keep pressure

to repair this problem (a) the pressure switch is not working,(b) check valve or non return valve sticking(stripe down repair and refit)

Posted on Sep 29, 2009

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