Air compressor motor and capacitors.

[@santiagoribeiro4187]

Functionally operates just as it should kzbin.infoUgkxiiMg_x4gIWeXMWfBnDdRnME4qJUAva4w holds pressure perfectly when not in use. Glad one of the other reviews pointed out that the bottom pressure release valve was open; thought it was defective at first.

[@boosted420a]

My compressor would trip the breaker immediately when I turned it on. At first I thought I had a bad starting cap, but I tested mine and it checked out ok. I watched your video and saw the part about sanding the points on the on/off switch and decided to take a look at mine, and they were in really bad shape. A light touch of some 220 grit sandpaper and some contact cleaner fixed the issue. Thanks.

[@cecil6711]

I am happy the video helped you. Thanks for watching. :-)

[@marklewis9635]

You rock, thank you for number 1 warning me of shock danger and number 2 explaining in layman's terms. Keep up the good work.

[@ELUSsSIVE]

good work? felt dizzy after trying to read capacitor specs out of focus. No one has informed him about minimum criteria for posting videos. at least know how to focus your camera or use a camera that can focus.

[@ThadeousMonkey]

Thank you! This has got to be the most useful video I've senn yet! 3 days I've been on this dang Internet looking for straight forward answers and your video cleared up all my questions! Thanks again!

[@ncautoman57]

Glad you're a part of the garage gang! Thanks for the video.

[@kevinfreeman8853]

First off, thanks a lot Cecil !, My Devilbiss compressor went down about 6 years ago,(Fuse ) and thanks to being able to see the the Numbers on your capacitors(which got lost) I ordered 2 wired it up and wam bam.... It has awaken from a long slumber. Again I thank you and your upload , Kevin

[@turbocobra]

Awesome, thanks Cecil, I will be headed down to Grainger later today to get the capacitors. Appreciate you making the video and calling me last night.

[@stevegunderson2392]

There is no DC voltage applied so the chances of residual charge is pretty low, but safety comes first. Also the voltage and value of the capacitors can change over time. The dielectric material inside the cap can drift with heat and time. Good video I hope it saves a lot of motors out there!

[@danelectro68]

I've learned something today, I didn't know a motor had a start and run capacitor, so thank you cecil :)

[@ziggassedup]

That's a very helpful vid Cecil...Electricity plays for keeps...I got bit once...240v @ 10 amps...It sure let me know who the boss was..!..Threw me off a ladder and across the room...Ouch..!

[@snocrushr]

Great video with good information for all, Thanks for taking the time to make it.

[@bobwoodkat]

Great vid!! Everyone who has a compressor should know all this stuff. Most of us guys have no idea how much danger is sitting in that corner of the shop making all that racket!!

[@cecil6711]

Usually if there is only one capacitor, it is a start capacitor to get the motor running but does not need a run capacitor to keep it running. Thanks for the great question.

[@DavesKustoms]

Good vid!! I've seen the aftermath of a cap blowing because it weren't discharged, its not a pretty sight, the guy barely survived. Later.....

[@daveparker1334]

You da man! You answered every question I had in this one video. Thanks.

[@cecil6711]

I am glad you liked it Rich. Thanks for watching.

[@cecil6711]

On single start capacitors like yours there is no polarity. It will work either way. I hope this helps. :-)

[@cecil6711]

Thank you for watching(with all your thumbs)lol Have a great day. :-)

[@danelectro68]

Thank you cecil for the offer, I may well take you up on that. Yeah I'm alive and well, didn't do too much on the car today, but might do a video in a while :)

[@valveman12]

Your run cap should not need discharge since it is in series with the coil. I'm surprised your start cap does not have a bleeder resistor. Great video BTW.

[@cecil6711]

Thanks for watching.

[@alfrejaime]

tks for the video you help me a lot.(i got a air compressor and star running very weak and after 15 seconds makes like up and down en then dies.) you know any store they can have a capacitor or needs to be ordered by online.?

[@cecil6711]

I believe Gary said it ended up that the motor was just full of sanding dust on the centrifugal switch points and the guy at the shop blew it out and it ran fine so he returned the capacitors. Funny story about the camera zap(unless you were the engineer).lol Capacitors have eaten my lunch a few times and it is NOT FUN. Thanks for watching Dave.

[@cecil6711]

Thank you for watching. :-)

[@jimclark6256]

stop using your phone camera until you learn how to use it. However your info is correct and useful.

[@cecil6711]

Thank for watching John.

[@cecil6711]

Me too. Thanks for watching and commenting.

[@cecil6711]

Thanks Darrin. :-) It is just info that I picked up working on stuff over the years.

[@cecil6711]

I am glad you enjoyed the video.

[@cecil6711]

Some only have a start capacitor and three phase motors don't need capacitors at all. Each case could be different. Thank you for watching Dan.

[@cecil6711]

Great idea. Thanks for watching.

[@pnakogee55]

I was looking for brushes did not find any but find capacitors one black n one white. I did not know one is for start n one is runner. I found the air compressor motor at the scrap yard n I take home to fix it. it looks good. so am looking around for video how to check ot if it is good. ur video is formative. 10-Q

[@IMAMEMEATMEDOTCOM]

WHEN SHORTING THE CAPACITOR USE AN INSULATED SCREWDRIVER OR CALL THE PARAMEDICS AS YOU MAY END UP IN A WOODEN BOX THIS IS NOT SOMETHING TO TAKE LIGHTLY

[@cecil6711]

steph wood Very true. Thank you for the comment and watching the video.

[@cecil6711]

You are welcome,thanks for watching the video.

[@stewartbruce2409]

Just today my 5hp quincy stopped working, with only a loud humming sound and no movement when switched on. Hopefully with your guidance I will solve the problem. Do you think most likely its the start capacitor, as opposed to the centrifugal switch. Thank you Cecil for a well executed tutorial, you certainly make the world a better place!

[@cecil6711]

It does sound like the start capacitor as the centrifugal switch usually sticks in the low speed position (at least in my experience) which would let it start turning but would prevent it from going up to full speed. You might also want to check to make sure you are getting full voltage to the motor through the pressure switch before purchasing a new start cap. I hope this helps and thanks for watching the video. :-)

[@stewartbruce2409]

@@cecil6711 Solved the problem today. It was the female connector on capacitor separated from the stud where its riveted. In the past I got a temporary fix by attempting to solder it back on. This time could not solder it back so I drilled into the stud and tried securing connector with a screw. Don't no how long it will last, but working as of five hours ago. Do you have any suggestions how to secure the connector back to the stud where once held by a rivet? I ordered a replacement capacitor, but I enjoy the challenge to to repair it. Anyway thanks for the prompt response and I send my blessings to you and family from New Rochelle N.Y. All the best, Bruce

[@cecil6711]

@@stewartbruce2409 I am glad you figured out the issue Bruce. Could you possibly use a small machine screw with a nylok nut instead of the screw? It sounds like you are running out of options on the tab of the capacitor. I enjoy the challenge of repairing instead of replacing stuff as well but sometimes you only get so many chances before you have to bite the bullet and replace a component. Good luck and all the best. Cecil

[@stewartbruce2409]

@@cecil6711 Thank you Cecil, Wishing much health and happiness for you and family this upcoming holiday season.

[@cecil6711]

@@stewartbruce2409 Thanks Bruce. Happy Holidays. :-)

[@cecil6711]

No I haven't been zapped by one of those but it is about the only thing that hasn't lit me up.lol I have gotten shocked too many times to count(may explain whats wrong with me). :-P Thanks for watching.

[@douglewis6286]

Hey cecil , have a husky 33 gallon with start and run cap, how can i tell which is which?

[@Rasd4Metta]

Great video buddy!! Awesome info about air compressors! Hey but quick question for ya. I got a double pull 30 amp breaker running mine, and every so often it kicks the breaker when it goes to start. I reset the the breaker and it will run fine,most time it starts and runs with no problem, but it seams like every 5 start cycles it trips the breaker. Not sure if I have a bad breaker or maybe I'm using to low of a breaker. Any thoughts?

[@robbiegwinn]

awsome vid...very helpful

[@fernadocolunga6531]

i hope that you can help me i have a compressor that it when I use the air and it needs to refill it sounds like it turns off and on and it takes a while to get it to fill and everything else works after its filled

[@enriquecarmona6498]

Process of elimination, remove v belt, turn it on. Continue misbehaving? electric side is the culprit. If not, then place the v belt back on run to where it would start having issues, stop the compressor, bleed the air and restart if issue reappears at a given psi, say 60 or 80 then, most likely check valve is guilty.

[@cecil6711]

Thanks for the comment.:-)

[@jwhrivnak]

Very informative, thank you.

[@mycompasstv]

great post, thanks

[@wheresWaldoCmill]

Great video! Quick question, i just bought a run and start capacitor for my old coleman powermate black max series. Everytime i turn it on it trips my breaker. Any tips on what to do to stop this?

[@vwdarrin]

good stuff bud you are a smart man

[@outtatime4512]

How can you tell the difference between the run and start capacitor other than their microfared rating? Are their protective covers labeled?

[@cnewell1971]

motor turns fine, replaced the start capacitor and still just hums...where is the centrifugal switch located?

[@265chevy]

great info thanks man

[@RC-Heli835]

How much horsepower does this motor have? I have a 5HP motor on an 80 gallon tank in which the original Run capacitor has been lost. I have a 25MFD 370V working now but the cover will not go over it and bolt back in place on the motor as its too wide at 2 inches. Mine has 2 start capacitors and one run capacitor. I checked the size of the one you have here and its 1-3/4 wide which would fit my cover.

[@cecil6711]

Thank you.

[@313theman2011]

I have a t30 Ingersoll Rand compressor. It was missing a capacitor. So not knowing I took the model number off the one that was still connected and bought another one of the same. The motor has four wires coming from it. The capacitor has four connections. So with the other one I bought there are now eight connections on the two capacitors. But only four wires coming from the motor. How do I connect these wires to the two capacitors. The model number on my motor is 6k757bb. One more thing is both of the capacitors are mounted in the same box. Rite next to each other. I'm only saying this because I seen compressors that have two capacitors but their separate. Located on either side of the motor. Mine are connected within the same housing. So that led me to believe that they were connected to each other. Can u help me? I've exhausted my online searches and can't find anything to help.

[@satajet883]

That was exelent!

[@scottmorton345]

How many horses does that motor have? I’m trying to find out which start capacitor I need

[@josepheckels6228]

Hello! Thank you for the video! I have a different problem. I have what looks like the exact same motor but I have no data plate. I am wanting to convert from 120 VAC to 240 VAC. Is there a diagram on the motor or do you have the make and model numbers? Thanks again Joe

[@vvcold]

I have an air compressor with just one capacitors so how do i no if its a run or start capacitors?

[@houstontxhouston]

I have a 33 gallon craftsman that capacitors look like this.. i removed the capacitors with out taking pics.. how can i figure out what wires go where? i have two black wires to one capacitor and one white and one blue to the other capacitor.

[@vvcold]

Sorry got one more 4 you have the capacitor out but there is no polarity on the top and i never removed it so how do i no what the connections are?

[@michaelbishop2870]

Hey. Bro. I've got a Sears 3.5 horse power air comp. It hims when I turn the switch on. Can you help me. Thanks

[@frankgarza5159]

The label on my emglo wheelbarrow compressor is damaged do you know what capacitors start and run should I put on it

[@mustie1]

thanks,well done

[@cecil6711]

You can call me about anything you need help with buddy. I am having a great day. I hope you are as well.

[@chriskate7]

Big help thank you

[@NutsandBoltsAuto]

I just got a really old Sears air compressor from my dad. When plugged in, it just hums. I removed the capacitor.. It only has 2 terminals like the one on the right (in your video). I found a similar one for sale on amazon. Im gonna order it, but how do I know which wire goes where? I mean, theres only two possibilities... What would happen if they go on backward?

[@cecil6711]

If the wires and terminals are not marked, it does not matter which wire goes on which terminal. I hope this helps and thanks for watching the video.

[@roger76543221]

How do I make it rotate the right way my runs backwards?

[@johnpetts1880]

Hey great video I need to no on my compressor motor has a red and black each side but left side has a narrow white wire where might it go

[@johnnygonzalez7874]

What would cause the start up capacitor to smoke and pop ? I had two mess up already and don't know where to trouble shoot. Air compressor and motor sound fine, but after a few seconds turning it on the capacitor starts to smoke and then trips my breaker.

[@cecil6711]

It could be a couple of things. First, does the motor have a centrifugal switch on the wired end? If it does and it is stuck it could be keeping the motor engaged in the start windings and overload them to smoke the capacitor. Second, remove the belt and try just starting the motor without the compressor to check motor operation without any load on it and see if it comes up to full rpm. If it starts and runs,then shut it off and replace the drive belt and use an amp meter on the motor power wires to check amp draw with the belt tightened to specifications. It is also possible the motor bearings could be sticking causing drag on the motor. I hope this helps. Thanks for watching the video.

[@blakem2011]

Have this same issue i bought it used it had a cut wire fixed the wire and fired it up blew capacitor instantly noticed the capacitor that was in it was to small got the correct capacitor and it also blew! 😭

[@castledomeknives9395]

great info..... What if motor starts to smoke after 2 -5 minutes...what would cause this?? T I A

[@cecil6711]

I would check the amperage draw on the motor as well as the rpm's to make sure the motor was getting up to full revolutions and the amp draw was within the motor ratings. It is also possible the run capacitor is defective. Good luck.

[@darrellmorgan4041]

I have a baldor 120/240 single phase 3hp that just hums. need help installing new compasitor's i think that's my problem.

[@CaptnNate]

Hey man. Great video, very informative. I have a very similar compressor but having an issue you may have seen. First time starting it ran up to speed fine and got to 25psi before the motor slowly came to a stop. Second time starting the motor never came to speed, only very slow turning and not building any psi. Could this also be because of the caps?

[@cecil6711]

Most definitely. They help out when the motor is under load. I see it all the time in HVAC condensing units where the outdoor fan turns slowly then not at all. Thanks for watching the video. :-)

[@bobbylaws9936]

What would make a compressor not start or get any power it’s a brute 15 gallon pull or push for on and off it’s a red button

[@MrDpotts2]

Have a Devilbiss C5E60VAD-1 with 5 peak hp motor. Motor has a start and a run capacitor. So far I have replaced the in tank check valve and the start capacitor. Still having trouble as follows: If the tank is empty, everything starts and runs normally until the pressure switch turn the motor off. I can stop and start anywhere from zero pressure to cut off pressure and all seems normal. I can come back an hour later and try to start and then the motor bogs down and turns the pump much slower. The unloader valve seems to be working fine. I have removed the unloader tube and checked to make sure it in not obstructed. I can disconnect the 1/2 inch tube that runs from pump discharge to tank check valve and the compressor starts and runs normally. I can then push the tube into the pump discharge and the motor will bog down again. The run capacitor checks good and within the - 6% tolerance. I was wondering if you had run in to any thing like this. Could the motor be getting weak? Run capacitor bad? Something else? I am stumped. Please help.

[@JamesLaVaccaTX]

David Potts I am having the same problem. Did you ever find a solution?

[@kevin21852lynn]

have you drained the condensate out of the tank it could be full of water and causing the compressor to kick off to soon, just a thought

[@daveharms5153]

FOCUS!!!

[@CaptnNate]

Thanks for the quick reply! One more question. OEM capacitors for my motor are running between 75-85 dollars each! Cheaper caps like from grainger are fine as long as the farads match?

[@cecil6711]

That is correct,the voltage and the microfarads should match. I usually get mine from Grainger or my local A/C supplier if I am in a rush but they are usually cheaper from Grainger.. Good luck.

[@vvcold]

Thks :)

[@ariesraven1]

Great info. Thanks for sharing.

[@jamesanderson2023]

Show Wireing diagram for A.O.Smith 220 Single Phase 15 ample Two pole air COMPESSOR MOTOR

[@cecil6711]

You are welcome.

[@GregsGarage]

Awesome vid!! Added to the utubegaragegang channel.

[@peterheinermann4208]

just out of curiosity, is this motor a 5HP? magnetek or century? 208-230V ??

[@frankmartin6126]

Probably rated at 5hp spl, which means it's not exactly a true 5, but rated that way for compressor use. It's a Century design ,years ago Century and Magnetek joined forces, today it's Century and A.O. Smith that's together.

[@robeftyearian8760]

Man I finally found out whsts wrong with mine tgank you

[@cecil6711]

That's great!!! I am glad you got it figured out. Thanks for watching. :-)

[@samuelmendezhidalgo3117]

Can you help me with something.. I need to change the rotation from a simillar motor, do you know how to do that? Thanks

[@samuelmendezhidalgo3117]

Thanks Steven, I'll try it.

[@MuhammadAmin-co4ie]

i have an air copmressor of atlas copco company. i was working good but yesterday i changed fuel filter & engine oil filter and engine oil also after that when i try to star it is not working...it is giving a fualt(starter speed too low)..and RPM goes to 145 and go down slowly to 116 and triped...any solution please???

[@cecil6711]

I am sorry to say that I do not know much about engine driven compressors but I hope you find a solution. Thank you for watching the video.

[@ronbrown1901]

Does anyone happen to have an Emerson t63xwbss1486 motor and would be willing to share pics of the capacitors with me so that I can put this gifted compressor back to work.

[@tylerj2655]

Can u wire air compressor motor to a car battery and have it run

[@cecil6711]

Only if the motor is 12 volt DC. It will not run if the motor is 120 or 240 volts AC. Thanks for watching.

[@cecil6711]

I hope you get it repaired. Call me if you need any more help or just want to chat. Later buddy. :-)

[@tylerj2655]

120 pancake air compressor trying to put in truck so when outback in mt have compressor for tires

[@cecil6711]

You could use an inverter rated to carry your compressor wattage. It converts 12 volts DC to 120 volts AC but you need to make sure it is rated large enough to carry the compressor load.

[@cnewell1971]

my compressor just hummed when I turned the switch..turned it on and off a couple of times and now nothing.

[@cecil6711]

Does the motor turn at all? With the switch turned off,try turning the pulley. If it turns freely it may be the centrifigal switch or the start capacitor. Probably the capacitor. Thanks for watching.

[@cnewell1971]

Not sure.. .gonna take the belt off today snd see if it will turn ..i just used it a week ago and it worked fine..it is about 8 to 10 years old...its a colemon powermate 6o gallon..thanks for the advice..very helpful

[@racer4x930]

had that problem with mine and started tapping the reset buttom while it was humming and it started so i just bypassed it and works fine now

[@asksteevies4941]

👍

[@cecil6711]

Thanks for the thumbs up. :-)

[@PaulSmith-tf9bn]

I have a Craftsman air compressor 150 lbs, at about a 100 too 125 lbs of pressure the motor starts jogging, as if it want to stop and run at the same time. Can you help. thank you

[@loveablehades]

I know this is late. But run cap could have leaked or started dying. but still runs.

[@carlocasiple8336]

Connection mottoe w capacytor

[@cecil6711]

Thanks for watching the video.

[@durgashankarchobisa4507]

Humko do paise 5 hai ki Mota Chala nahi

[@stephenlewis4251]

Need some help

[@ernestobautista1810]

220------110 jel

[@cecil6711]

It is a 220 volt compressor. Thanks for watching. :-)

[@stephenlewis4251]

Not showing any thing I need to know

[@samruzz7334]

your camera is going wild ...makes me dizzy.. slow it down a bit ..thanks

[@cecil6711]

I am sorry for the late reply. I will slow it down for sure. Thanks for watching.

[@vtec230]

hi guys...just on on pressure switch issue, contacts being welded together...i had same prob but just wired the switch to a relay which in turn fed the motor...relay ampage is rated a lot higher and will never have any problems...its like a slave for your pressure switch..its doing all the work and saves the lil guy :-)

[@davemiii]

Catching up on vids. Did it turn out to be the cap? Sometimes that little centrifugal switch can stick. Funny story - drinking with buds on a ski weekend about 10 years ago. Drunk electrical engineer taking apart one of those old disposable cameras. He says "Ya gotta be careful with these things cause even though it's not that big, the cap for the flash can carry a large ZZZAAAAAAAPPP" and he falls backward off his chair going "OW OW OW OW OW!"

[@jvmiller1995]

I think you got the general idea down pretty good. I would not recommend any one to buy parts from Grainger unless you just can't find anywhere else. Grainger has it all and most likely in stock but are you ready to pay that premium price. Just get the numbers off the old cap and google it. I had a start cap get burned up a quick search on line I purchased a two start caps and two run for my compressor. So that's 4 caps free 2 day shipping and it was $23 bucks. Now if you have to have that day then get the $30 one from Grainger. I would like to add a cause for a start cap to smoke. The copper line that goes from tank to compressor head. There is a little brass fitting screwed in the tank and the copper line hooked into it. That fitting in the tank is a check valve. It let's air in from compressor head but when the compressor stops it keeps the air in the tank. There is also a small copper line sometimes it comes from the head of compressor sometimes from the little check valve in the tank. Ok now the other end of little line goes to the pressure control box. So this is important to know how this all works because if this system is not working right you will destroy a motor or start cap fast. So here is how it goes. The compressor runs until it reaches it set top pressure in the little box he is talking about cleaning the contacts. When it reaches pressure its contacts open. The little copper line going to it has a small valve similar to a valve stem. When the they open the compressor stops and the contacts then press the little valve and this let's the air trapped between the compressor and check valve. This has to be working. If the check valve is bad or or it fails to empty the pressure from the head of compressor than the compressor tries to start under load. Most of the time it just sets and hums. But will start sometimes but real slow. Most the time it hums and the the start cap will get smoked. And smoked as in that's what it will do is blow up or the start cap will smoke. I typing all this so you can better understand how your compressor works and know why its burned up. Because if you don't fix the problem you will be replacing more than one cap. Nice video a bit shaky on camera works. I hope you don't mind the long comment. Just trying to make sure people understand what other parts they might need.

[@cecil6711]

Thank you Jeremy for taking the time to watch the video and all of the fantastic information in your comment. I really appreciate the great information. :-)

[@jvmiller1995]

+cecil6711 sure thing. i glad you took the time to make one in the first place. there is a lot of stuff I hate about modern technology. but that said if a person takes the time to watch some videos and read some postings you can kinda tell when it's something to put stock into. or if it helpful or someone speaking from their ass. but that said aside from learning brain surgery there really isn't much you can not learn off KZbin and the net in general. but it really is because of people like your self making the videos. I keep saying now I retired I just going make KZbin videos. I got a couple on some homemade tools but just keep putting off doing more. so thank you. I book marked this I want to go check out a few more of your videos

[@cecil6711]

Usually the wires on each capacitor go on each terminal opposite each other and color doesn't matter as long as you get one wire on each terminal . It is important however to put the capacitors back on the same wire pairs they came from(left cap back where it came off and right cap back where it came from). If you need further help,pm me and I will be glad to help. :-)

[@iceman22st]

Whoa, I just had a flashback to my High School electronics class! I actually understood most of what you were talking about. Thanks.