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Username Post: Air compressor start problems        (Topic#356776)
awsum55 
Senior Member
Posts: 8862
awsum55
Age: 67
Loc: O.P. Kansas
Reg: 09-27-01
06-11-19 09:43 AM - Post#2768225    

My compressor stopped working the other day when I wasn’t using it, it has a slow leak, so it probably started up to replace air and blew a fuse. When I went to start it , it made a very loud buzzing noise and wouldn’t start, so I used youtube to find a solution.

The start capacitor was dead when I went to check it with my multimeter as instructed by the video. I purchased a new start capacitor, installed it and tested the motor while off the compressor for a split second and it started.

I read that start capacitors have no polarity but I had to remove a resistor from the old one and solder it to the new one. I was concerned that the resistor might have polarity that would make it important to install it in the right direction, but I couldn’t find anything that would tell me how to do it.

I put everything back together and hit the switch, this time it started and blew the circuit almost instantly.

I’m concerned that I might have hooked the wires up wrong, when I put the run capacitor back on after testing it. The start capacitor has 3 terminals and the wires attaching to it were all black. I can’t find any markings on the case that would tell me what each one was.

When I tested the run capacitor it was supposed to be 30mf plus or minus 6%. It was 28mf which is just slightly low. 6% of 30 is 28.2 so I knew it was a little low, but close enough I thought. Is .2mf enough to make the compressor not run and blow a fuse?

I’m kind of stuck on what to do next, do any of you have any advise on how to solve this?

Five things that you cannot recover in life:

* The Stone after it's thrown
* The Word after it's said
* An Occasion after it's missed
* The Time after it's gone
* A person after they die


 




bobb 
Super Senior Member
Posts: 5447
bobb
Loc: paradise
Reg: 09-05-03
07-04-19 10:20 AM - Post#2769926    
    In response to awsum55

i do not think resistors have polarity like diodes. did you use a heat sink when soldering? did you check the motor brushes?

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
hilandr451 
Moderator & "11th Year" Gold Supporting Member
Posts: 3845
hilandr451
Loc: Houston, Texas
Reg: 01-02-02
07-09-19 10:27 AM - Post#2770285    
    In response to awsum55

  • awsum55 Said:

I’m concerned that I might have hooked the wires up wrong, when I put the run capacitor back on after testing it. The start capacitor has 3 terminals and the wires attaching to it were all black. I can’t find any markings on the case that would tell me what each one was.



Here's your problem Vern!

what we need to do is find a wiring diagram for your compressor motor (should be under the inspection cover where the power wiring is), make/model of your compressor and post some photos so we can see what we're dealing with. I'm confidant that we can get you back on line in no time!

(IMO: brushes wouldn't be a factor in this scenario since it started just fine when he "tested" the cap)


-The Hilander.
Silver 2017 Silverado 1500 double cab 2WD 5.3L,
1966 C20 Custom Camper "Rattle can primer red" 5.7L, 700 R4 trans 410 diff. front disc, p/s
Project Pics


 
65_Impala 
Very Senior Member
Posts: 4232

Reg: 12-29-02
07-15-19 04:26 PM - Post#2770776    
    In response to awsum55

Did you check that the unloader is working?



 




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