Harbor Freight Central Pneumatic Air Compressor Parts Repair

Central Pneumatic Air Compressor Parts

I have compressor here today we’re going to see if we can identify what’s wrong

with it it never never gets higher than 80 psi and it probably takes 10 minutes

to get there this is Harbor Freight central connect pneumatic and I just

figured to take it apart see if there’s anything I can do to make it work better

I don’t think 10 minutes is a correct time to fill up and I’m sure it should

go higher than 80 now the 80 psi could be the regulator but still it should be

charging up 100 psi and it should be doing it and you know less than 10 minutes

so anyway I’m already taking the screws out and got the cover here and there’s

some wires that are connecting I’ll give you a look here on the inside just kind

of looking at it you know pretty sure this is a compressor problem I don’t

think it’s a tank link because it will hold 60 psi all the time you know maybe

it could be a blow by issue but I don’t think so you’d notice that especially

when was shutting off so I think this is the culprit here the compressor piston

now this is an oilless compressor I don’t really you know I imagine it was

just a piston piston and a check valve and then there’s got to be a bleeder


valve somewhere that would bleed off the pressure on the head for starting up

unless this thing has just got enough torque that it can take off with head

pressure but I would be willing to bet there’s a check valve in here and then

there’s a leak or something but anything anyway what I’m going to do is going to

take the head off loosen this connector here take the head off and just look down

take a look at the valve and the head you know maybe it’s just dirty or

something or bent sometimes you can just straighten it out and then we’ll see if

the check valve here is working because when I pull this I’ll find out where the

check valve is and I’ll point that to you and then I’ll just show you what I

can about it a couple other thing there’s a circuit board in here I don’t

know if you can see that probably can’t case you never see one of these there’s

the pressure bus the regulator the regulator so you plug your hose into

this is a ball off and then there’s this you know the motor there’s a circuit

board here I don’t want to present sure what the circuit board would be for

there’s a right here is a pressure sensor and then that tells it when it

shut off when the hey I suppose when the tank pressure gets hot hit 200 psi it’s

supposed to tell the motor to shut off so we read on there Oh 80 psi 85 psi

okay you can see it right on the relay and then well I will dig into it and I

will give you some more details about the guts but main thing is I want to

take that piston head off okay I just pulled these wires off and so there’s in

here and I want to flip it upside down because that it screws on it but this is

a breaker a fuse and then a switch so they’re tied together and this is in

parallel so the two wires that come off just tie into those two connectors right

there okay so I get the top I’ll get some more tools and I’ll be right back

all right so got the half-inch wrench here that off okay I think just a

standard compression fitting and then since I’m not oh flyer fitting that

compression pick this one off so it’s holding a 25 psi referee right now so

serves a cage at 30 psi so I’d have to say that there’s a check valve down in

here it’s holding the air pressure okay take off the cylinder piston head and

see what we can find okay these are long screws that go all

the way down just want to see if I get them loose a little rust around this

like maybe the previous owner had left it out in the rain or something I’m

going to get the screw gun I’ll be right back

so mainly I just use this compressor to blow chips off I mean I have a little

bit bigger one this one’s just sorry about the shameful oh my gosh earthquake okay

I use this a blow chips out of a mill and laser cleaning out the garage tray

and I just noticed this I’m in this thing going on and so okay okay so what

we see here is a an o-ring and a but yeah there’s a check valve in there I

don’t see where that separates though I do see an imprint in there there’s a

yeah but there is a one-way check valve in there and then that was it silicon

our ring to hold on the top of the hold down this on top of that and there is it

a check valve here to I was just blowing on it to see if yeah and then here’s the

piston just solid piece of metal here let’s take a look at that

it doesn’t feel like metal or if it is metal it’s plastic it’s really

lightweight that’s pretty interesting okay and then here’s the piston and just

got a really delicate oh ring and then a check valve in the top so I don’t really

think there’s much I can do to this I can check the check valves

blow out the dust look at the cylinder wall I mean I can’t

see it I mean I I’m almost sure this is plastic I just a plastic piston okay

then here check file look good I don’t know you know maybe this thing is

supposed to take eight minutes to charge up I’m going to go ahead and dry put it

back together and see if I just got to test the pressure coming out of here and

see what I can see okay so for a test I just want to put my finger over this

thing and I was looking for things wire do these just get these connect together

and I found this uh some of you guys might recognize this old-timers it’s a

glazing pin for if you got a wood frame window the this is what holds the glass

in and you put them all the way around the glass but that pier is like that

will hold this together for just my test see here like this way there we go

alright, okay so plug this end is going to be real loud but I just want to see what

got what I feel out about here it does appear to be a high-volume pump

but I could hold that back with my thumb and you can hear the motor spin up there

go go ahead and put this back on to see if maybe if I knock any dirt or debris

out of the piston this is hoping and hoping right just it’ll make a difference

alright it went up to 90 psi took a couple minutes but I think what I’m

going to do here is actually go ahead and time this thing I went to the

website here Arbor freight and was taking a look at it they are delivered

here you can see the highlighted one cubic feet per minute at 40 psi 60 cubic

feet or 0.6 cubic feet per minute at 90 psi so if we just assume that the air

delivery rate is 0.6 cubic feet a minute at 90 psi and we’ll just forget about

this number for right now so we’ll just say let’s just say that the pump only

delivers point six cubic feet per minute

okay well that’s fine so I went here to Google and I just said this is a three

gallon ministers a three gallon three gown three gallon tank and so a one

cubic foot is seven point four so just doing some really really rough math here

it should take let’s see here seven point four cubic gallons back to the

math stuff all right let me figure this math out and then I’ll come by but it

would seem like it should take less than a minute to charge this up so I’m going

to go ahead and get my head wrapped around the math and I’ll get back okay

this is some really bad math here I’m not going to do all the details but the

compressor should put out six cubic feet a minute okay one cubic foot equals 0.75

gallons just to do some rough math a divided in half 3.75 gallon okay so that

number is higher but let’s just say it was 3 gallons so if this thing should do

six cubic feet a minute which would be 3 it down three point seven five gallons

almost four gallons and it’s got a three gallon tank it would take less than less

than one minute to fill this tank all right even if let’s just say even if I stop at

95 but this thing won’t even go to 100 so it stops at 85 or 90 so I’m going to

go ahead and time it and we’ll see how long it actually takes I went ahead and

bleep let the tank down to nothing sit here or close to nothing all right and

we’ll go ahead and give it a shot they get my timer out here okay and here we go

all right so here’s the results at one minute it was a 50 psi at one and a half

minutes it was 65 psi at 2 minutes it was 75 psi and shortly after that it

just stopped operating at about 85 psi.


Source : Harbor Freight Central Pneumatic compressor repair

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