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Emglo AM78-HC4V motor stutter when nearing cut off
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10 years 4 months ago #590
by popparottz
Emglo AM78-HC4V motor stutter when nearing cut off was created by popparottz
the motor in my Emglo AM78-HC4V starts fine, pumps well, but stutters a bit as it nears cut off pressure. Are there brushes in these motors? I replaced the pressure switch thinking the contacts were worn out but it still stutters. Any advice would be appreciated.
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10 years 4 months ago #591
by MTR-Admin
Replied by MTR-Admin on topic Emglo AM78-HC4V motor stutter when nearing cut off
This could happen for a variety of reasons.
Make sure you're not running it on an extension cord.
The motor Reset Switch may need to be replaced.
The Pump/Motor Assy isn't aligned on the base properly (most likely this is it).
This is the case with these direct-drive units, if the unit isn't aligned on the frame properly it'll cause this.
Try doing this:
Remove the motor from the unit by removing the two 7/16" nuts under the motor. Remove the supply line. Remove the cover from the motor. Loosen the two 10mm nuts that hold the motor together. Put the motor on a flat kitchen style countertop. Twist both halves of the motor. Now, make sure that all 4 points of the motor frame touch the countertop and that there is NO rocking. Retighten the 2 10mm nuts being careful to not overtighten and breaking the aluminum frame. Reassemble the plastic housing, place back on the metal saddle and install supply line and 7/16" nuts.
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Make sure you're not running it on an extension cord.
The motor Reset Switch may need to be replaced.
The Pump/Motor Assy isn't aligned on the base properly (most likely this is it).
This is the case with these direct-drive units, if the unit isn't aligned on the frame properly it'll cause this.
Try doing this:
Remove the motor from the unit by removing the two 7/16" nuts under the motor. Remove the supply line. Remove the cover from the motor. Loosen the two 10mm nuts that hold the motor together. Put the motor on a flat kitchen style countertop. Twist both halves of the motor. Now, make sure that all 4 points of the motor frame touch the countertop and that there is NO rocking. Retighten the 2 10mm nuts being careful to not overtighten and breaking the aluminum frame. Reassemble the plastic housing, place back on the metal saddle and install supply line and 7/16" nuts.
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10 years 4 months ago #595
by MTR-Admin
Replied by MTR-Admin on topic Emglo AM78-HC4V motor stutter when nearing cut off
How old is the unit? And yes, there are Brushes in this particular Motor.
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10 years 4 months ago #596
by popparottz
Replied by popparottz on topic Emglo AM78-HC4V motor stutter when nearing cut off
it's probably 25yrs old.
I tried your suggestions. I aligned the motor and pump, ran it with the reset switch out of the circuit, plugged it into an outlet 2 ft from the panel and it still stuttered although it seemed a little better. In taking the unit apart I found the insulation on the wiring was badly deteriorated so I fixed that...got a little better...found what appeared to be an arch spot on a paddle connector and wrapped it with electrical tape and it got a little better still. I've had it apart five times and I'm tired of working on it. When I get inspired again I'll replace the internal wiring and look at the brushes. How hard is it to get to the brushes?
I tried your suggestions. I aligned the motor and pump, ran it with the reset switch out of the circuit, plugged it into an outlet 2 ft from the panel and it still stuttered although it seemed a little better. In taking the unit apart I found the insulation on the wiring was badly deteriorated so I fixed that...got a little better...found what appeared to be an arch spot on a paddle connector and wrapped it with electrical tape and it got a little better still. I've had it apart five times and I'm tired of working on it. When I get inspired again I'll replace the internal wiring and look at the brushes. How hard is it to get to the brushes?
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10 years 4 months ago #598
by MTR-Admin
Replied by MTR-Admin on topic Emglo AM78-HC4V motor stutter when nearing cut off
Well with the age of the hand-carry we may want to look into the windings and armature. It is possible that this may be the cause of the symptoms.
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