Dormeyer Silver Chef 4300 Mixer Question

I've been refurbishing a chrome Dormeyer Silver Chef 4300 mixer. So far I have replaced the hardened grease in the gearbox, replaced the frayed power cord, oiled the motor bushings, and cleaned up the chrome surfaces which had very little surface rust. The removable brushes were in great shape and long enough to make me think the mixer saw little use during its lifetime.

After putting it all back together, I noticed that the motor ran even when the speed selector was in the off position. It also didn't seem to run very fast when selecting high speeds. So I tweaked the thrust adjustment screw on the governor and that seemed to correct both issues.

The only problem I now have is that there is a slight amount of visible smoke being emitted if I leave the motor running at low speeds for a length of time (more than 60 seconds.) It's possible that it is also smoking at higher speeds, but I suspect that the fan on the front of the motor may be dissipating the smoke so that it is not visible.

The smoke appears to be coming from the back side of the motor near the rear bushing. At first I thought that the smoke may have been coming from some oil that leaked out of the bushings that I replenished. But it's still being emitted after running the motor on and off for at least 30 minutes or more of total run time.

There is a resistor that is also very hot to the touch on top of the motor. It is marked with the number 135 and when I ran an ohmmeter on it, it read at 138-139 Ohms. It's possible that the smoke may be coming from it or somewhere underneath it.

All of this testing has been done with no load on the mixer yet. It runs smoothly otherwise and I have a full range of speeds now. There is perhaps a little rattle at the lowest speeds, so maybe some more speed adjustment is needed.

So does anyone have any ideas on the source of the smoke? Is it just burning a little oil? Is the resistor the culprit? Is it the rattle at low speeds that is stressing the motor?

Here are some pics of the mixer and the resistor.

Thanks - Jeff

Photos... < > Photo 1 of 7 View Full Size


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Post# 1030712 4/24/2019 at 11:04 (1,827 days old) by maranoman (Des Moines, Iowa)
Checkrate/Likes I've been refurbishing a chrome Dormeyer Silver Chef 4300 mixer. So far I have replaced the hardened grease in the gearbox, replaced the frayed power cord, oiled the motor bushings, and cleaned up the chrome surfaces which had very little surface rust. The removable brushes were in great shape and long enough to make me think the mixer saw little use during its lifetime. After putting it all back together, I noticed that the motor ran even when the speed selector was in the off position. It also didn't seem to run very fast when selecting high speeds. So I tweaked the thrust adjustment screw on the governor and that seemed to correct both issues. The only problem I now have is that there is a slight amount of visible smoke being emitted if I leave the motor running at low speeds for a length of time (more than 60 seconds.) It's possible that it is also smoking at higher speeds, but I suspect that the fan on the front of the motor may be dissipating the smoke so that it is not visible. The smoke appears to be coming from the back side of the motor near the rear bushing. At first I thought that the smoke may have been coming from some oil that leaked out of the bushings that I replenished. But it's still being emitted after running the motor on and off for at least 30 minutes or more of total run time. There is a resistor that is also very hot to the touch on top of the motor. It is marked with the number 135 and when I ran an ohmmeter on it, it read at 138-139 Ohms. It's possible that the smoke may be coming from it or somewhere underneath it. All of this testing has been done with no load on the mixer yet. It runs smoothly otherwise and I have a full range of speeds now. There is perhaps a little rattle at the lowest speeds, so maybe some more speed adjustment is needed. So does anyone have any ideas on the source of the smoke? Is it just burning a little oil? Is the resistor the culprit? Is it the rattle at low speeds that is stressing the motor? Here are some pics of the mixer and the resistor. Thanks - Jeff Photos... < > Photo 1 of 7 View Full Size