I like the way your patient with your helper I see he's not as experienced but you treat him with respect and are nice and patient. Why can't there be more guys like this.
You remind me a lot of my buddy, a PM mech and motor winder of 40 yrs. Things I recall him telling me. Keep a history of PMs. End bell, rear bearings blow out=badly balanced commutator. Don't rebuild. Leave replaced parts in the unit. Tells the next mech the history of repairs. Thanks for the videos. Oh. Dumber than doorknobs. Warehouse had their in house janitor fix it people install a 16 ton HV unit. Ran but didn't do the job. Had a company install another 16 ton unit at the other end of the building. Worked fine but the other end, the offices, were freezing or cooking. Finally called my friends company and they sent him out. One minute later they had all the air they wanted. (3 phase motor running backwards.)
Ha Nice! Youd be surprised how many times that happens. Had an electrician kill 2 compressors (scrolls) on a brand new unit that way. Instead of reversing the phases at the disconnect he did the blower only. Blower was going the right way but the compressors were running backwards.
FACEPALM! Okay, you need the big dumb one. My buddy got called out to a portable rock crush. It had just been moved. The temporary breaker arrays, sheets of plywood on poles, off to one side. Leaning against about 15 breakers were shovels used as props to keep the contactors from tripping. Yup. They moved the entire crush without writing down which contactor for which motor. They color coded the legs, but not which went where.
Nice video. Most of the time with wobbly bearing failure almost always your stator will be damaged from the rotor. The gap between stator and rotor is very small. Any play in the rotor will cause it to make contact with the stator. Usually the only time bearing replacement on motors is if the bearings are siezed/locked up.
The smoke hasn't come out of it yet, nothing wrong with that motor. I replace a lot of 3 phase motors at work. They live in a radiation chamber and it destroys the bearings. 1-2 years and they're done. When they come out, the insulation is shot too so I can't even rebuild the things. I have those same motors outside the radiation field and some are original from the mid 80s. Amazing what a bad environment will do to things. We did find out that the motor shafts on the Baldor motors we use are 1035 and they press out fairly easily. Nice handy lathe stock if you need any shorter pieces.
Problem is I have to stand behind it if I were to give it to the customer. I can't guarentee it then it doesn't go back. As for personal use I'd be using them off of a VFD. If for any reason the insulation was compromised or weakened, the high voltage spikes the VFD produces could destroy it and arc possibly damaging my VFD
I´d give the first one a try. I mean, it ran, so the windings aren´t damaged. It may have lost a few percents efficiency or power, for light workshop use it might be ok. Or if it is only for quick replacement until a new motor is ordered (weekend emergency job).
looks like the mounting plate bottom has a U cut instead of a drilled hole. .. so you don't have to pull the lower long bolt.. just loosen it and yank upwards.. will make installing it even easier..
Hey Greg, I thoroughly enjoy the HVAC videos, especially since Jim Pettinato hasn't uploaded lately. Have you ever seen the cooling fins on the coils corroded to the point they become dust on an outdoor central AC unit. Apparently my dog has been pissing on my ac unit and when I recently cleaned it, I found the lower third of the fins have turned into dust. is there a remedy for damaged cooling fins? Or should I just run the thing till it shits the bed?
silveradoman298 Yes I have seen that before. Since I'm mostly working on commercial roof tops it's usually from someone not cleaning the coils correctly. Unfortunately there is no real fix for this, but as long as it's not a huge area effected it should run ok. You may notice on really hot days the A/C may not be working as well because of the coil damage and inability to transfer heat. One quick fix we use is to put a sprinkler on really low and let some of the water run over the coil. It's not ideal, and there are a lot of variables in that putting too much water and cooling the unit off too much will also cause an issue, but it may get you out of a jam.
I'm sure there's a reason but, seems this rebuild reduces the opportunity to sell them another motor down the road. Perhaps this is an all inclusive maintenance contract.
460V * 4.8A = 2208VA (Watts)... 2208VA/745.7 = 2.96HP No Yellow sticker required! :-) You were being short changed on the 5HP motor, works out at 4.6 When are we going to see some more Southbend referb?
I like the way your patient with your helper I see he's not as experienced but you treat him with respect and are nice and patient. Why can't there be more guys like this.
Ryan Scherbluk because most of the best tecs are a type personally
Always good to see these "real work" videos. Appreciate your effort in making and showing them.
You remind me a lot of my buddy, a PM mech and motor winder of 40 yrs.
Things I recall him telling me. Keep a history of PMs. End bell, rear bearings blow out=badly balanced commutator. Don't rebuild.
Leave replaced parts in the unit. Tells the next mech the history of repairs.
Thanks for the videos.
Oh. Dumber than doorknobs. Warehouse had their in house janitor fix it people install a 16 ton HV unit. Ran but didn't do the job. Had a company install another 16 ton unit at the other end of the building. Worked fine but the other end, the offices, were freezing or cooking. Finally called my friends company and they sent him out. One minute later they had all the air they wanted.
(3 phase motor running backwards.)
Ha Nice! Youd be surprised how many times that happens. Had an electrician kill 2 compressors (scrolls) on a brand new unit that way. Instead of reversing the phases at the disconnect he did the blower only. Blower was going the right way but the compressors were running backwards.
FACEPALM!
Okay, you need the big dumb one.
My buddy got called out to a portable rock crush. It had just been moved. The temporary breaker arrays, sheets of plywood on poles, off to one side. Leaning against about 15 breakers were shovels used as props to keep the contactors from tripping.
Yup. They moved the entire crush without writing down which contactor for which motor. They color coded the legs, but not which went where.
What a great video, not only the main job but the follow up was great to see... cheers
Really Good Video. good view of the inside of that motor messed up.
keep the hvac videos coming!
Nice video. Most of the time with wobbly bearing failure almost always your stator will be damaged from the rotor. The gap between stator and rotor is very small. Any play in the rotor will cause it to make contact with the stator. Usually the only time bearing replacement on motors is if the bearings are siezed/locked up.
Yeah. Sometimes I've saved them. The older motors just seem to rub and make a shiny spot. The newer ones seem to self destruct.
The smoke hasn't come out of it yet, nothing wrong with that motor.
I replace a lot of 3 phase motors at work. They live in a radiation chamber and it destroys the bearings. 1-2 years and they're done. When they come out, the insulation is shot too so I can't even rebuild the things. I have those same motors outside the radiation field and some are original from the mid 80s. Amazing what a bad environment will do to things.
We did find out that the motor shafts on the Baldor motors we use are 1035 and they press out fairly easily. Nice handy lathe stock if you need any shorter pieces.
Problem is I have to stand behind it if I were to give it to the customer. I can't guarentee it then it doesn't go back. As for personal use I'd be using them off of a VFD. If for any reason the insulation was compromised or weakened, the high voltage spikes the VFD produces could destroy it and arc possibly damaging my VFD
Its a joke. I'd install that one in my scrap bin too, maybe after salvaging the shaft as usable stock for making smallish stuff.
I´d give the first one a try.
I mean, it ran, so the windings aren´t damaged.
It may have lost a few percents efficiency or power, for light workshop use it might be ok.
Or if it is only for quick replacement until a new motor is ordered (weekend emergency job).
Nice vid. Looks like you have a good apprentice.
Yup. coming along nicely
looks like the mounting plate bottom has a U cut instead of a drilled hole. .. so you don't have to pull the lower long bolt.. just loosen it and yank upwards.. will make installing it even easier..
We notices once we had it out. Couldn't see it under the plate.
yup here in calif they require you to know trigonemetry to get state liceanse
Hey Greg, I thoroughly enjoy the HVAC videos, especially since Jim Pettinato hasn't uploaded lately. Have you ever seen the cooling fins on the coils corroded to the point they become dust on an outdoor central AC unit. Apparently my dog has been pissing on my ac unit and when I recently cleaned it, I found the lower third of the fins have turned into dust. is there a remedy for damaged cooling fins? Or should I just run the thing till it shits the bed?
silveradoman298
Yes I have seen that before. Since I'm mostly working on commercial roof tops it's usually from someone not cleaning the coils correctly. Unfortunately there is no real fix for this, but as long as it's not a huge area effected it should run ok. You may notice on really hot days the A/C may not be working as well because of the coil damage and inability to transfer heat. One quick fix we use is to put a sprinkler on really low and let some of the water run over the coil. It's not ideal, and there are a lot of variables in that putting too much water and cooling the unit off too much will also cause an issue, but it may get you out of a jam.
I'm sure there's a reason but, seems this rebuild reduces the opportunity to sell them another motor down the road. Perhaps this is an all inclusive maintenance contract.
Always funny to hear a New Englander cuss - "you bastud" - funny stuff!
460V * 4.8A = 2208VA (Watts)... 2208VA/745.7 = 2.96HP No Yellow sticker required! :-)
You were being short changed on the 5HP motor, works out at 4.6
When are we going to see some more Southbend referb?
cool video.
Great video! That's a old unit.
Well now, hush that mouth, I do declare that I heard you use a swear word.....good man, it always makes the day go smoother.
Oh it gets bad sometimes. Especially when something goes wrong. You usually hear some new words then
the barings is toast
More of these!
I been working with gloves when possible
Hi why struggle to take wires off motor in situ I always remove motor then remove connections. If cables are long enough nice videoLes
Wires are too short to remove the motor and they're zip tied everywhere. Easier to take them off first
ok Halligan got best way again. thanks
Wobblybob
I think you missed a few operations in your math......
Your version of "Baaasterd" sounds more authoritative. Mine doesn't have any flavor just run of the mill plain.
:-)
Why all that work just change the motor...
Because it's a Carrier