The centrifugal start switch was stuck in the run position instead of releasing to "start."
@davida1hiwaaynet3 жыл бұрын
I hope the eBay seller compensated you for your time repairing THEIR new motor.
@killer26002 ай бұрын
Sounds like you fixed it instead of them refunding you.
@vincentrobinette15073 жыл бұрын
Last time I had this happen, it was the check valve in the receiver tank where the big line from the compressor head goes in. If that check valve doesn't seal off perfectly, the unloader valve may be too small, to keep the head pressure off the compressor, which makes it difficult for the motor to start. The compressor shouldn't even "know" how much pressure there is in the tank. I can tell, by the compressor rolling over abruptly when a piston reached top dead center, which tells me, that the motor is producing pretty good torque. Check the pill in the check valve,(remove the big line from the compressor to the tank, then, remove the check valve assembly) Then, make sure the starting capacitor is indeed being switched in when the motor is stopped.
@super-z89432 жыл бұрын
In that case there would be continuous hissing from the unloader valve. Or if you manual release it, you can do it over and over again. Pretty easy to check.
@davidrule1335 Жыл бұрын
@@super-z8943 No you wont! Not after the air closes the reed valves in the head.
@alexyochum5648 Жыл бұрын
@@davidrule1335on my compressor the reed valves are before the unloader valve, and the tank’s valve is after both. So you would hear the hissing, the reed valves would do absolutely nothing
@anoldmkoba3673 ай бұрын
My motor fail to push the belt i dont know why is the couses of that!!
@reyesmeza388 Жыл бұрын
I had same problem with my air compressor, it had a 5” pulley on motor and after it cycled off and and like 3 times it would get really hot and humm. Had to attach an electric fan next to the pump just to help cool it down to finish my project. Later I swapped the 5” pulley to a 1 1/2” pulley and now it’s a lot more quiet but runs super slow. It won’t overheat no more but when I’m using power tools and it cycles back on it takes a good minute to shut off. I put a 4” pulley a new eBay 5hp motor and it works great the first 3-4 cycles and it also overheated, in the middle of using a da palm sander. Finally I swapped the 4” pulley to a 3” pulley and now it works perfect. Keep in mind also had to change v-belts too. Replaced the pressure switch when I first bought it so I know that was not the problem.
@reyesmeza388 Жыл бұрын
So basically my new 5hp eBay motor did the exact same thing as my old 3hp factory motor, I have a 60 gal compressor and most use a 4” motor drive pulley, so a 3” is pretty close enough, can handle the 5hp twin cylinder pump from harbor freight and it has 56” v-belt.
@TerenceLeaf110 ай бұрын
I agree I think you got a defective motor you showed relieving the unloader valve so I assume when you had 40 psi in the tank your check valve isn’t allowing any pressure to flow back in other words you did check to make sure your check valve is not leaking back and causing motor to not be able to start up due to it lt maybe leaking pressure It seems like it’s leaking and no motor will be able to start back up if that check valve leaks anyway did you get it replaced and did it fix the problem ? If not seriously take out the check valve test it by blowing only one way
@airframedent10 ай бұрын
Took the motor apart and the centrifugal switch was stuck in the run position. Took it out and cleaned up the moving bits and it's run just fine ever since. Btw, I did test the check valve. Thought that was included in the video.
@steelthunder763 жыл бұрын
That was absolutely no help
@davidmitchell18952 жыл бұрын
I have a Ingersoll Rand 1 phase 220 the black is on one side and the white wires on the other side I have a red wire to solve two sides I know supposed to hook up where in the world do I hook the white wire if I take it loose
@markamcampbell57956 ай бұрын
i have an old sears horizonal air compressor with a 250 lb shutoff switch. i got it for free took it home plugged it in and nothing. tried flipping the lever on the side of the pressure switch still nothing. it is still sitting in my garage gathering dust. it sounds like a winter project if I can get parts.
@derrickhillier11733 жыл бұрын
Thanks for the vid Jim.I purchased a new 3hp 60 gallon sanborn air compressor that after the first startup for the break in period when the compressor built up air & kicked out like its suppose to.When i hooked up the impact gun & started using air,the motor just hmmms & wont start up.Keep in mind its a new compressor.I replaced the start & run capacitor.I had a licensed electrician verify the wiring is correct.The compressor motor spins freely.Leading me to believe the electric motor is a dud.Your thoughts would be appreciated.
@omarrama922 жыл бұрын
The run capacitor? No need to throw money for it, the problem is only on the starter cap. All though it is better to buy a new one.
@davidallen238710 күн бұрын
My compressor is doing exactly what your is doing any ideas
@Shazzamm1971 Жыл бұрын
A pressure switch isn’t technically the unloader. Start capacitor is pooched and your in tank CV or the unloader isn’t really working. Unloading should happen automatically on powering off the motor. I guess that’s why industrial electricians are different than we electro-mechanics rotating equipment specialists (Millwrights). Too high of an oil level causing oil carryover upon unloading caused the two valves (unloader and in tank check valve) to get sticky and a few starts under those conditions failed the start capacitor. Compressor troubleshooting is a Millwright’s job.
@Eddie650013 ай бұрын
I had the exact same problem with same motor. Not powerful enough to turn the compressor
@Garth20115 ай бұрын
Lots of variables these days because of the cheap Chinesium products being shipped to the USA. I would bet the capacitors are weak...most of them are imported junk and only last maybe 1 to 2 years on equipment. You can put a meter on those caps and determine if they are weak. Replace them with USA made caps. Good electric motors are Leeson, Baldor and another brand I can't think of however, they are a good $400 to $600 for an application like this compressor.
@omarrama922 жыл бұрын
Pretty sure the motor lacks starting torque. It might be that the starter capacitor lost it's capacity, or it's a bad factory design that they didn't use a higher capacitance value cap. Still, you can improve the motor starting torque by changing it's original starting cap with a much much higher capacitance. Still the capacitor will not give it a really big starting torque and the motor may not start.
@davidrule1335 Жыл бұрын
That switch you are flipping is the on/off switch. The unloading happen on it's own.
@backyardbuilttrucks12 жыл бұрын
I have a brand new DeWalt 60 gallon that does that now 3 months old used it maybe 10 times . $639.00 china POS.
@troyb96094 ай бұрын
Ck the run capacitor and start capacitor for the correct microfarads
@davidclark36033 жыл бұрын
Centrifugal switch, or, start capacitor?
@mortezadehgan42273 жыл бұрын
I think it maybe from low capacitor You must change it with big capacitor.
@raulmarin87042 жыл бұрын
You need to put a small pulley in the motor
@piremakumar8702 жыл бұрын
Why did fuse blowing once switch on...and I found my capacitor gone wrong... any possiblity for the reasons fuse get blown of this capacitor!!!
@airframedent2 жыл бұрын
No idea really. Sorry.
@super-z89432 жыл бұрын
Start capacitor should disengage within a couple of seconds of starting. For some reason your start caps are still on, hence over current, motor heating, capacitor damage. Check unloader valve. If unloader valve is faulty, motor will never reach cut off rpm for centrifugal switch to kick off. Decrease in rpm is easy to detect. If unloader valve is working, it might be faulty centrifugal switch or starting capacitor. If only centrifugal switch is not working, rpm would seem normal. It is easy to test capacitors or you can swap a new one.
@ChrisLandrum-dt4yd2 ай бұрын
What is the brand name of the motor?
@johnjkizer6399 Жыл бұрын
Does the motor have a bad start capacitor, I know it has a run capacitor as well but I’m thinking that’s good.
@justintothetruth3 жыл бұрын
Hey what was it
@jgonz71584 ай бұрын
eBay sells junk.i had the same problem with my electric motor
@johnvandenburgh87712 жыл бұрын
I have a Kobalt 30 gallon and the motor slows down to almost a stop then speeds back up again. I know this was years ago but maybe someone has a suggestion. Thanks
@mrmidnight323 жыл бұрын
Where did you get your replacement?
@airframedent3 жыл бұрын
No replacement. Just cleaned all the burrs off the original parts.
@mikecrawford5331 Жыл бұрын
I suggest buying a quality American made motor.
@airframedent Жыл бұрын
I suggest you mind your own wallet and leave me to mind mine.... thank you very much. I fixed that motor a day or so after this video. It now has thousands of hrs on it and is running just fine.
@somenotherdude3335 ай бұрын
@@airframedentSo it was the pressure switch "stuck"?
@Z-Ack3 жыл бұрын
Bad capacitor.. that guys got a start and a run.. likey both are out of spec.. hell i bought a brand new hermetic fridge compressor straight from the factory not too long ago and damn thing had a bad cap fresh off the floor. Made not even a few weeks prior with all the inspection and test marks on it... was rated +\- 10% and thing was out of spec 70%.. and friggn embraco tried to give me the run around and video myself testing the damn thing before they shipped me a new one.. million dollar company worried about a 60$ part.. jeez,.
@chrisblackmer8670 Жыл бұрын
It’s not the motor it’s because you don’t have a compression release
@diggLincoln Жыл бұрын
Check Valve
@louismaxcy5661 Жыл бұрын
Check valve
@jamesenewold88642 жыл бұрын
Bad check valve between pump and tank
@airframedent2 жыл бұрын
Nope. Fixing the centrifugal switch had it going again. I did comment on that.
@aloisiki50012 жыл бұрын
What types of oil does a compressor need
@davidrule1335 Жыл бұрын
Non detergent motor oil.
@scottseal4183 жыл бұрын
Start capacitor
@dansprouse239311 ай бұрын
Bad start capacitor
@faisalfaixal23763 жыл бұрын
my compressor motor builds 40 pounds and motor slows down spining plz tell me what can be the problem i have bought if fresh outiside my state what cpuld be the problem
@davidrule1335 Жыл бұрын
Work on your grammar and punctuation please.
@faisalfaixal2376 Жыл бұрын
Is this a test for my grammer skills?
@mroak65044 жыл бұрын
Was it possibly a bad start capacitor?
@airframedent4 жыл бұрын
The centrifugal switch was stuck in the run position.
@davidrule1335 Жыл бұрын
@@airframedent Why didn't you mention that in the video? We heard a click, was it the breaker or the start switch? We also heard the check valve leaking air back into the head.
@jamesanderson2023 Жыл бұрын
See Utube
@robertbyers72754 ай бұрын
I had the same thing with my sandbon it was the Moter it is a Chinese piece of shit