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  #16 (permalink)  
Old 05-14-2016, 03:00 PM
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i am going to ask you to also... verify that your tank is NOT full of water... i have seen that happen in shops... over 50 gallons of water in an 80 gallon tank.. the guys who were assigned to drain the tank opened the valve at night to drain it.. nothing came out so they closed it.. figured it was a magic compressor..

that the check valve from the pump output tube into the tank is NOT leaking back..

air compressors also have a rather short life span on their compressor oil...

i seem to recall it was only 25 hours of run time between changes..

if a compressor is really run hard... it might run 25 hours a week..

it is also usually NOT conventional motor oil .. its usually non detergent.. or special oil from the local air compressor supplier..

and quincy pumps are indestructable.. when the gas station i worked at closed.. the 10 horse 3 cylinder quincy had been supplying air to a shop that was open from 7 am till 10 pm and 4 lanes of full service with 4 gas pump jockeys 18 hours a day and 2 for the last 6 hours midnight to 6 am.. it cycled on every 5 to 10 minutes from 1941 to 1993... without anything but compressor oil changes.. air filter changes.. belt changes every 5 years..

edit.. you might also want to redesign your compressor to tank pipe.. do you have flaring tools for that size... can you go left 90 degrees.. down 90s... right 90... so there is some expansion and contraction in that tube.. or put in a flex coupling.. and i really don't see the tank check valve either..

double edit..

can you get a better picture of the info on the top of the compressor pump or info off the sides.. i can see made in USA... but nothing else..


Last edited by 69612; 05-14-2016 at 03:13 PM.
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Old 05-14-2016, 03:10 PM
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When's the last time you heard the double bell when you ran over the signal hose? Probably just before the attendant ran out to get your windshield.


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Old 05-14-2016, 03:16 PM
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Originally Posted by boothboy View Post
When's the last time you heard the double bell when you ran over the signal hose? Probably just before the attendant ran out to get your windshield.


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no.. i worked in the shop.. i did cover the guys for lunches when the normal lunch guy did not show up..

each guy had his own lane.. and there was almost always at least 2 cars in line for each lane.. under the hood check. tire check.. clean the windows.. pump the fuel..
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Old 07-05-2016, 06:40 AM
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Originally Posted by MARTINSR View Post
I have an old stand up 80 gal 5hp compressor. It has lost it's umph and has gotten so that it can't keep up with event he smallest tool. It will pump up to 100 lbs or so and then when you use that air in the tank it starts pumping and simply can't keep up with a die grinder. It takes a long time to pump up to the 100 of course too.

I am thinking it simply needs a pump, everything else works fine.

It has a twin cyl side by side pump. Over at HF they have two pumps, one that looks just like the one it has that they call a "3hp" pump, no we aren't talking about the motor, we are talking about the pump.

And then the "5hp" pump which is a V twin.

And for some reason they have a few of each with different part numbers that I can't for the life of me figure out the differences.

Air Compressor Pumps at Harbor Freight Tools

Why does mine look like "three horse power" pump? I like the more output of the V twin, not sure if it will fit on mine, I didn't check that. Neither bolt on as the bolt pattern is different.

What do you think?

Before scrapping it remove the flap valves and put your thumb over the hole to see if its making compression.
Most of the time its a stuck flap valve in the head.
there is also a one way valve that lets air in the tank but not out and back to the head. and last remove the head and place something flat over it like a piece of plexi glass to see if the rings are bad if they are it wont make compression. I wouldn't throw that out rings arn't expensive and usually something like dirt will plug up a valve holding it open and all you need to do is clean them. It could even be as simple as a clogged air filter

Last edited by deadbodyman; 07-05-2016 at 06:53 AM.
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  #20 (permalink)  
Old 07-05-2016, 08:48 AM
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Thanks, I haven't done a single thing since I posted this thread! That is what I will do first.

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