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TS motor - not firing up (Houston - we have a problem)

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Forum topic by John Smith posted 05-06-2018 07:05 PM 3182 views 0 times favorited 32 replies Add to Favorites Watch
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John Smith

2012 posts in 668 days


05-06-2018 07:05 PM

I bought a 1.5hp 110v electric motor off of E-Bay about a year ago. (new – not reconditioned).
not more than 10 hours on it total. it has worked flawlessly until today.
it is on a dedicated 20 amp breaker.
on start up, it hums like it is binding. the blade arbor turns freely,
the motor pulley turns freely, the belt is snug but not overly tight.
if it hums for more than 5 seconds, it trips the 20amp breaker.
pushed the red reset button on the motor many times, even with the belt off – it will not kick on.
at first, I thought it was the paddle on/off switch as it gave me problems a couple of months ago.
removed the switch from the frame, still no go. also removed the zero clearance insert = no go.
how does one go about checking a capacitor without a mulitmeter ?? (I have one, but can’t find it).

.

.

-- I am a painter. That's what I do. I paint things --


32 replies so far

View Fred Hargis's profile

Fred Hargis

5738 posts in 2998 days


#1 posted 05-06-2018 07:16 PM

Usually the capacitor will have a strong smell and leak some oil when they blow (usually). But replacing one is like a $10 excerise, so if you suspect one (or both, if there are 2) are bad it isn’t a big deal.

-- Our village hasn't lost it's idiot, he was elected to congress.

View John Smith's profile

John Smith

2012 posts in 668 days


#2 posted 05-06-2018 07:22 PM

I used the saw a few times this morning with no issues – then – no go.
am only cutting a few pieces of 1/2” birch plywood – nothing heavy.
the motor was not hot, the capacitor was not hot, no strong burnt smell,
no fluids leaking out. only one capacitor.

-- I am a painter. That's what I do. I paint things --

View patcollins's profile

patcollins

1687 posts in 3370 days


#3 posted 05-06-2018 07:25 PM

Sounds like it may have a bad winding, is there any lack of power?

View John Smith's profile

John Smith

2012 posts in 668 days


#4 posted 05-06-2018 07:28 PM

it has power to the motor – thus the humming sound – but does not spin.
tapping the blade with a stick while humming, it appears to be frozen.
then when switch is turned off, it turns freely by hand.

-- I am a painter. That's what I do. I paint things --

View Loren's profile

Loren

10477 posts in 4153 days


#5 posted 05-06-2018 07:28 PM

It’s probably not the issue with such a new motor,
but occasionally I’ve got a humming motor to
go again by taking the belt off, turning it on and
spinning the shaft by hand. The motor will sometimes
pick up and go and then I let it run for 20 minutes,
shut it off and turn it on again. I’ve had a few
“fix” themselves this way.

View Ripper70's profile

Ripper70

1325 posts in 1414 days


#6 posted 05-06-2018 07:28 PM

Are you sure it’s wired for 110V? If it is, the capacitor is an easy remedy and won’t cost much. If the trouble is beyond the capacitor it may not be worth the cost of repair, depending on how much you paid for it of course. I’m assuming it was an eBay bargain.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

View MrUnix's profile

MrUnix

7478 posts in 2704 days


#7 posted 05-06-2018 07:33 PM

Classic symptom of a failed start system – either the capacitor or centrifugal switch. Try to get the motor spinning by hand and then apply power. If it works like that, then you have verified it is something with the start circuit. Capacitor is easiest to test first. Plenty of on-line info on how to check with a multimeter set in it’s highest resistance setting if you don’t have one that has an actual capacitor setting. If it tests good, then you need to look at the switch.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View John Smith's profile

John Smith

2012 posts in 668 days


#8 posted 05-06-2018 07:53 PM

yes – I am sure it is wired for 110. it is a dedicated circuit for the table saw, miter saw,
router and sanders. I used a router and two sanders so I know the circuit itself is okay.
with the belt off, I turned the motor by hand while it was humming.
it turned by itself for maybe 3 or 4 turns before the breaker tripped.
now the motor is warm to the touch….... I can’t find my multimeters so I can’t check it that way.
I do have a similar motor with a (what seems to be) similar capacitor.
I will try the change tomorrow – I just don’t feel like messing with it anymore today.
this is the motor I bought off of ebay. 5 stars (oh lucky me).

thanks to one and all for the input – will buy ANOTHER multimeter tomorrow.

what happened to the old 1/4hp washing machine motors that seemed to last 75 years with ZERO issues ???

,

,

-- I am a painter. That's what I do. I paint things --

View Ripper70's profile

Ripper70

1325 posts in 1414 days


#9 posted 05-06-2018 08:31 PM



what happened to the old 1/4hp washing machine motors that seemed to last 75 years with ZERO issues ???

- John Smith


Those companies all went out of business…because they made motors that lasted 75 years with ZERO issues.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

View coxhaus's profile

coxhaus

145 posts in 1400 days


#10 posted 05-06-2018 08:35 PM

I had the same problem with buying a motor of eBay for my drill press. It ran fine at first but after 6 months or so it stopped. It now just hums. I took it to a motor shop. They told me the windings were bad so I gave it away. It cured me from buying motors off eBay. It was a 1120rpm 1/2 hp motor.

View John Smith's profile

John Smith

2012 posts in 668 days


#11 posted 05-06-2018 09:05 PM

I just went back to my Pay-Pal account and I bought this motor on 12/20/17.
so it is less than 6 months old. the seller’s listing says it has an 18 month warranty.
sent the seller a note of circumstances – so will wait on his response before I go
buy another one or pay $35 to have this one “evaluated” by the electric shop.

stay tuned ~ the saga continues [and we’ll see how this “18 month warranty” holds up].

.

.

-- I am a painter. That's what I do. I paint things --

View 000's profile

000

2859 posts in 1404 days


#12 posted 05-06-2018 09:20 PM

Did you, by chance, let out the magic smoke?

View John Smith's profile

John Smith

2012 posts in 668 days


#13 posted 05-06-2018 09:25 PM

har har har – I probably did, that’s why it is toes up now.

-- I am a painter. That's what I do. I paint things --

View GR8HUNTER's profile

GR8HUNTER

6439 posts in 1218 days


#14 posted 05-06-2018 09:34 PM

please check this switch really good i had one fail this year just like the one you showing unplug and hook wires direct avoid the switch then plug in saw HOPE THIS WORKS FOR YOU :<))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN

View John Smith's profile

John Smith

2012 posts in 668 days


#15 posted 05-06-2018 09:47 PM

Gr8 – how can the switch give enough power to make the motor hum then trip the breaker ?
(but I will try it tomorrow) [and that part has crossed my mind]

Edit: Curiosity got the best of me so I went and bypassed the switch to direct wiring.
well – it’s not the switch – it still exhibits the same symptoms.

-- I am a painter. That's what I do. I paint things --

showing 1 through 15 of 32 replies

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