We were using our Emglo and shut it down for a lunch break. When we came
back and tried to start it again all we got was a load electrical hum and
sometimes it would pop our 15 amp breaker.

I pulled the compressor/electric motor unit loose from the rest of the
compressor so I could get to its guts. When I turned the fan blade by hand
(it turned very easily) I could hear the compressor piston working. I even
connected the AC power back up but still heard the hum. When I gave the fan
a twist the motor started running the compressor. However, the motor won't
start the compressor on its own.

I tried a quick test of the start-up capacitor with my multimeter and it
appears to be OK. It slowly climbs in ohms until infinity. Reversed the
probes and it does the same thing. Sounds like the capacitor is OK to me.

I wanted to pull the electric motor loose from the case so I could see the
brushes and rotor. I removed all the mounting screws from everything I
could see, but I can't seem to pull the unit apart to get to the motor.
Everything is loose and I can twist the case a few degrees, but I can't pull
it apart.

Anybody know how I can get the motor out so I can look at its guts. Any
help is appreciated. Pretend I'm a dunce and be pretty specific.

Thanks,
Mike

Mike S. wrote:

We were using our Emglo and shut it down for a lunch break. When we came
back and tried to start it again all we got was a load electrical hum and
sometimes it would pop our 15 amp breaker.

I pulled the compressor/electric motor unit loose from the rest of the
compressor so I could get to its guts. When I turned the fan blade by hand
(it turned very easily) I could hear the compressor piston working. I even
connected the AC power back up but still heard the hum. When I gave the fan
a twist the motor started running the compressor. However, the motor won't
start the compressor on its own.

I tried a quick test of the start-up capacitor with my multimeter and it
appears to be OK. It slowly climbs in ohms until infinity. Reversed the
probes and it does the same thing. Sounds like the capacitor is OK to me.

I wanted to pull the electric motor loose from the case so I could see the
brushes and rotor. I removed all the mounting screws from everything I
could see, but I can't seem to pull the unit apart to get to the motor.
Everything is loose and I can twist the case a few degrees, but I can't pull
it apart.

Anybody know how I can get the motor out so I can look at its guts. Any
help is appreciated. Pretend I'm a dunce and be pretty specific.

Thanks,
Mike



It's probably still the start cap. Given the relatively low expense of
electrolytic capacitors, I'd just replace the start cap and see if that fixes
it. My guess is it will.

Take off the "bubble" on the side of the motor and look at the start cap. It may
obviously be defective, or maybe you can just get the numbers off it and take
them to Grainger or wherever you go to buy a new one. Easy to splice it back in,
simple fix. Even if that isn't the problem it won't hurt and it will probably
only cost you like $7.

GWE

Hi Grant,

It's probably still the start cap. Given the relatively low expense of
electrolytic capacitors, I'd just replace the start cap and see if that
fixes
it. My guess is it will.

Take off the "bubble" on the side of the motor and look at the start cap.
It may
obviously be defective, or maybe you can just get the numbers off it and
take
them to Grainger or wherever you go to buy a new one. Easy to splice it
back in,
simple fix. Even if that isn't the problem it won't hurt and it will
probably
only cost you like $7.

Well, not quite. I've been told by two repair houses that this cap costs
$50. I want to make sure it's dead before I replace it.

Thanks,
Mike

Just because a cap doesn't leak at the low voltage provided by a VOM
does not mean it isn't leaking at working voltage. Try substituting
another cap and see if it helps. My outside air conditioning unit was
doing exactly the same thing. Diagnosis: bad starting cap. If your
motor uses two caps (one for start, one for run) check the centrufugal
switch
that controls the caps to see if it is broken.
Good luck. 73 Gary

Gary,

Thanks for the input. I'll try to find somebody local that can do a
heavy-duty test on this cap.

Mike

oh come on, mike - a cap costs $5 to $20, just change the stupid thing
- it's almost for sure the problem, and it's cheaper than spending all
week trying to test it.

On Mon, 16 Jan 2006 07:35:19 -0800, "Mike S." wrote:

Gary,

Thanks for the input. I'll try to find somebody local that can do a
heavy-duty test on this cap.

Mike

Bill

www.wbnoble.com

to contact me, do not reply to this message,
instead correct this address and use it

will iam_ b_ No ble at msn daught com

On Sun, 15 Jan 2006 15:53:43 -0800, "Mike S." wrote:

We were using our Emglo and shut it down for a lunch break. When we came
back and tried to start it again all we got was a load electrical hum and
sometimes it would pop our 15 amp breaker.

I pulled the compressor/electric motor unit loose from the rest of the
compressor so I could get to its guts. When I turned the fan blade by hand
(it turned very easily) I could hear the compressor piston working. I even
connected the AC power back up but still heard the hum. When I gave the fan
a twist the motor started running the compressor. However, the motor won't
start the compressor on its own.

I tried a quick test of the start-up capacitor with my multimeter and it
appears to be OK. It slowly climbs in ohms until infinity. Reversed the
probes and it does the same thing. Sounds like the capacitor is OK to me.

I wanted to pull the electric motor loose from the case so I could see the
brushes and rotor. I removed all the mounting screws from everything I
could see, but I can't seem to pull the unit apart to get to the motor.
Everything is loose and I can twist the case a few degrees, but I can't pull
it apart.

Anybody know how I can get the motor out so I can look at its guts. Any
help is appreciated. Pretend I'm a dunce and be pretty specific.

Thanks,
Mike

There aren't any brushes in an AC induction motor.

Disconnect the start cap and check both leads for continuity to the
plug or mains connection (with it unplugged, of course!) You should
see continuity from both cap connections to both line connections,
though the (low) resistances will be different. If one of them
check open, there's your problem.

The most likely cause is a failed centrifugal start switch.

Hope someone can tell you how to get the motor loose.

Most capacitor start motors have t

We were using our Emglo and shut it down for a lunch break. When we came
back and tried to start it again all we got was a load electrical hum and
sometimes it would pop our 15 amp breaker.

I pulled the compressor/electric motor unit loose from the rest of the
compressor so I could get to its guts. When I turned the fan blade by hand
(it turned very easily) I could hear the compressor piston working. I even
connected the AC power back up but still heard the hum. When I gave the fan
a twist the motor started running the compressor. However, the motor won't
start the compressor on its own.

I tried a quick test of the start-up capacitor with my multimeter and it
appears to be OK. It slowly climbs in ohms until infinity. Reversed the
probes and it does the same thing. Sounds like the capacitor is OK to me.

I wanted to pull the electric motor loose from the case so I could see the
brushes and rotor. I removed all the mounting screws from everything I
could see, but I can't seem to pull the unit apart to get to the motor.
Everything is loose and I can twist the case a few degrees, but I can't pull
it apart.

Anybody know how I can get the motor out so I can look at its guts. Any
help is appreciated. Pretend I'm a dunce and be pretty specific.

Thanks,
Mike


Probably starting switch inside the motor that connects the cap to the
windings. Try tapping on the end bell of the motor when you try to
start it.... The "points" eventually get a bit pitted and blackened,
and typically cleaning them up is all it will need....
HTH
Ken.

Ken Sterling (Ken Sterling) wrote in message
...
Probably starting switch inside the motor that connects the cap to the
windings. Try tapping on the end bell of the motor when you try to
start it.... The "points" eventually get a bit pitted and blackened,
and typically cleaning them up is all it will need....
HTH
Ken.

So if that's the case, how do I get to them?

Mike

Ken Sterling (Ken Sterling) wrote in message
...
Probably starting switch inside the motor that connects the cap to the
windings. Try tapping on the end bell of the motor when you try to
start it.... The "points" eventually get a bit pitted and blackened,
and typically cleaning them up is all it will need....
HTH
Ken.

So if that's the case, how do I get to them?

Mike


Mike,
Having trouble finding any kind of info on that particular model -
AM78-HV4V...... From your original post, it sounds like this is just
a motor, with a pulley, driving a larger pulley via a belt, as you
mentioned giving the "fan" a spin. Anyway, ya gotta locate the motor,
and take the end bell off to gain access to a centrifugal switch
internal to the motor. The switch has a set of contact points on it
which close with the motor at rest, putting the cap into the circuit.
When the motor starts up, centrifugal force causes the switch to open
up and takes the cap out of the circuit until it's needed for the next
start. Arcing, pitting, dust, dirt, etc., can keep the contacts from
making contact with each other when the motor is at rest. I suggested
tapping on the end bell of the motor when trying to start it as
sometimes that will let the contacts actually touch each other and get
the cap in the circuit to start the motor. That will tell you if the
cap is good or not as well as letting you know that the contacts are
dirty. I can't see the motor so it's hard to tell you how to take it
apart. Sorry.
Ken.

replying to Mike S., josh wrote:
no wrote:

We were using our Emglo and shut it down for a lunch break. When we came
back and tried to start it again all we got was a load electrical hum and
sometimes it would pop our 15 amp breaker.
I pulled the compressor/electric motor unit loose from the rest of the
compressor so I could get to its guts. When I turned the fan blade by hand
(it turned very easily) I could hear the compressor piston working. I even
connected the AC power back up but still heard the hum. When I gave the
fan
a twist the motor started running the compressor. However, the motor won't
start the compressor on its own.
I tried a quick test of the start-up capacitor with my multimeter and it
appears to be OK. It slowly climbs in ohms until infinity. Reversed the
probes and it does the same thing. Sounds like the capacitor is OK to me.
I wanted to pull the electric motor loose from the case so I could see the
brushes and rotor. I removed all the mounting screws from everything I
could see, but I can't seem to pull the unit apart to get to the motor.
Everything is loose and I can twist the case a few degrees, but I can't
pull
it apart.
Anybody know how I can get the motor out so I can look at its guts. Any
help is appreciated. Pretend I'm a dunce and be pretty specific.
Thanks,
Mike


Mike, I know this is OLD, but did you ever find out how to get inside to
the centrifugal switch? I have one w/the same symptoms and I don't wanna
ruin a $50 cap if the switch is stuck closed.

--
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josh fired this
volley in oups.com:

When I gave the
fan
a twist the motor started running the compressor. However, the motor
won't start the compressor on its own.


You never said anything about checking the unloader valve.
The Emglo compressors ALL have unloader valves (most compressors do), and
the compressors don't have a hope of starting up with any residual
pressure in the tank unless it's working.

LLoyd

On 2014-03-29, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
josh fired this
volley in oups.com:

When I gave the
fan
a twist the motor started running the compressor. However, the motor
won't start the compressor on its own.


You never said anything about checking the unloader valve.
The Emglo compressors ALL have unloader valves (most compressors do), and
the compressors don't have a hope of starting up with any residual
pressure in the tank unless it's working.

Or -- assuming a single-phase induction motor -- the start cap
could be blown, so it does not get that initial motion necessary for
the induction to generate pole pieces in the right place to pull the
motor round. (I didn't see the original posting -- could he be in my
killfile somehow?)

Enjoy,
DoN.

--
Remove oil spill source from e-mail
Email: | (KV4PH) Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
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"DoN. Nichols" fired this volley in
:

Or -- assuming a single-phase induction motor -- the start cap
could be blown, so it does not get that initial motion necessary for
the induction to generate pole pieces in the right place to pull the
motor round. (I didn't see the original posting -- could he be in my
killfile somehow?)


He checked all that, Don. Then, just turning the motor over by HAND, it
would start... that tells me it was dead-heading against pressure.

Lloyd

replying to Lloyd E. Sponenburgh , josh wrote:
lol. the original question was also how to separate the motor from the
pump to inspect the centrifugal switch. pump won't start up correctly
with 0 psi.

please look:

http://www.ereplacementparts.com/emg...189_15192.html

the main shaft can't be pulled out either way that I can see. the fan has
no apparent connection. it looks like it was put on and the end of the
shaft was tooled somehow to keep it in place. if it was popped off, would
it be conceivable to be put back on?

--
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http://www.polytechforum.com/metalwo...or-467755-.htm
using PolytechForum's Web, RSS and Social Media Interface to
rec.crafts.metalworking and other engineering groups