THERE IS A LOUD GRINDING NOISE COMING FROM THE ROOF

It's honestly been a good 5-10 years since I have changed bearings on one of these fans, they usually just replace them, surprisingly the process all came back to me.
HVACR VIDEOS MERCH WEBSITE - www.hvacrvideo...
Please consider supporting my channel by
Becoming a Patreon member - Patreon / hvacrvideos
Becoming a KZbin channel member / @hvacrvideos
By purchasing tools via my affiliate links below at TRUTECHTOOLS.COM and use the offer code BIGPICTURE to save 8% on your total purchase (exclusions apply)
Visiting my website and purchasing merch www.hvacrvideo...
HVAC OVERTIME CHANNEL LINK - / hvacovertime
Social Media
Facebook / hvacr-videos
Instagram / hvacrvideos
For any inquiries please contact me at [e-mail]
Mailing Address
HVACR VIDEOS
12523 LIMONITE AVE.
440 - 184
MIRA LOMA, CA. 91752

[@MrSmeagolsGhost]

“Have you got a screwdriver” proceeds to use it as a prybar/chisel. Love the honesty about what everyone does in the real world.

[@sherwinalvarez7365]

When people act like the bill is too high send them a video like this.

[@natepeterson7145]

Just imagine working for someone that lets you take pride in your work and not have to rush to get as many jobs done. I'd rather take my time and find all problems with time to address them than to just put out fires. Bet Chris is a great boss. Robert is one lucky dude.

[@DecarloRW]

Yup, the best way to achieve a big picture diagnosis

[@DJSubAir]

​@@DecarloRW absolutely within reason of course but your absolutely right

[@cameronblades2394]

You’d rather take your time beating the mess out of that shaft and install some bearings that should be ok?

[@lilgampla]

It's not just that it's shows the tech up and the company if you have to call them up 15 times for the same issue

[@sk31370n]

@@hvac_installer_guy9423 pretty sure he owns the company ;)

[@FirstWizardZorander]

That grease must have smelled lovely when you hit it with the torch 😂

[@BlazeFox89]

"You don't wanna scar the shaft" advice for life guys 😎👍

[@dashcamandy2242]

Never thought I'd see a ball joint separator (aka "pickle fork") used in the HVAC field, but the results speak for themselves!

[@HVACRVIDEOS]

I will discuss this on my Livestream this evening 3/27/23 @ 5:PM (pacific) on KZbin come over and check it out kzbin.info1yqPFoBgFdA

[@EyeMWing]

Watching you struggle with that bottom bearing, it's pretty clear what the problem was: You were not nearly angry enough at it.

[@TheJcjss]

Always use your helpers screw driver if your gonna use it as a pry bar. Classic tip

[@uzlonewolf]

"You need to be careful not to damage it in case you end up not replacing it" *proceeds to light it on fire* lol

[@trevorkolmatycki4042]

The benefit of aluminum is that it does not produce sparks when high speed aluminum hits aluminum. So fan manufacturers use aluminum in grease rated fans as a safety feature whereby if there ever is contact between the rotating fan and the stationary body it will not spark and ignite the grease on fire.

[@tiago222ofnewyork8]

The thing that I appreciated most about this video is seeing how you you interacted with your coworkers. The addition of your co-star, if you will, I feel really reinforced the principle of teamwork lead to great outcomes and that it's really not all just a one-man show. Thank you guys for what you do, it is greatly appreciated. 👍

[@swaimsj]

“Percussive Persuasion” Love it. Love the videos.

[@yz250a]

The term is: polar moment of inertia. 8:11 I'm glad to see you have good help!

[@petersmart1999]

Over the years I have found that Bahco pliers wrenches are better than chanelocs

[@fellpower]

Im working at big cnc machines - and if i have to change a bearing, i always cut them. Saves time, trying to break them loose. U learn over a few years, whats working and whats not. And a hint: For shafts im always using Scotch Brite Abrasive fleece. Thats a wonder thing. Makes everything nice and shiny.

[@Farm_fab]

Speaking of fan wheels, we were in need of new motors for our industrial pressure washers that we were upgrading from gas, and found two NOS Century motors, and had to have the aluminum fans removed. They'll never be the same. These were 7.5 HP, 440 vac. Since these motors sat outside in the weather, they needed new bearings, but they were a lot less than off the shelf, and the boss was happy with the outcome.

[@oldmetalguy4577]

I love watching it, but boy I dont miss those greasy days.

[@HVACRVIDEOS]

I will discuss this on my Livestream this evening 3/27/23 @ 5:PM (pacific) on KZbin come over and check it out kzbin.info1yqPFoBgFdA

[@dragonrider4253]

I kind of like seeing how you work through small problems like the stuck bearing. Not everyone has the time to watch a near hour long video, but when I get the time, I enjoy longer videos.

[@dhendy89]

I thought I was the only one who carried a pickle fork 😂

[@MattThaDJ]

Great edit, loved seeing your fault finding and thought process as you work.

[@ElectraFlarefire]

As an occasional thing this 'behind the scenes' version does work. I'm not sure it'll be popular if you do it every video due to the amount of 'dead time' rather than your normally much more condensed format, but it was really good seeing the interactions between you and your staff.

[@eskieguy9355]

While I'm not your target audience, I liked how you told us what the ideal situation was, and then we got to see what actually happened. If nothing else, somebody coming into the business could be doing this job & remember that it doesn't always go to plan.

[@Coffreek]

Watching somebody else struggle with a rust-welded bearing made my day. Thank you, and I'm sorry.

[@DelticEngine]

Hi Chris, many thanks for posting this video. I'm glad you tried a different style, I really like the more in-depth videos. Well done!

[@antoniobanza]

Hi Chris! Really enjoy seeing the extended version of the video, keep doing it. Regards from 🇵🇹

[@javierdelafuente9240]

I personally liked seeing a 3rd person view of you working it’s interesting and cool to see you working through the problems

[@MariosACandRefrigeration]

use a small sledge hammer and a long chisel loosen one re install then do the other.drill hole into shaft and sink allen screw so the shaft does not spin.thanks for sharing.

[@dalemarr70]

Funny how those bearings last like that. They're not meant to be in that "thrust" position. They should by all rights, just come apart as gravity pulls them. Dead blow hammers usually have lead shot in them not sand. I feel for ya Chris with these guys that have little knowledge about what needs to happen on things like this. I'd be ahead of you, on a simple job like this. Another nice vid though.

[@johnriff85]

LMAO leave it to the journeyman to have to borrow the apprentices tools to complete the job! Apprentices with any experience everywhere come stocked to avoid the ol' "go to my truck and get" statement lol!

[@petersmart1999]

Sorry for posting multiples,just throwing some things out there.Another tool that works pretty good is an SDR drill on hammer,use point or flat chisel bits to drive bearin to free it up,auto mechanice use aor chisels we rarely have aor so its the next best thing!

[@petersmart1999]

Chris,buy a Slugger slide hammer,invauable for removing bearings! I have reworked a couple of the tool heads,but it makes it easy!

[@HVACRVIDEOS]

I will discuss this on my Livestream this evening 3/27/23 @ 5:PM (pacific) on KZbin come over and check it out kzbin.info1yqPFoBgFdA

[@DkittrellGaming]

I personally like you showing the work, would love for you keep doing this

[@elcrazy8017]

The previous company I worked for, I did a lot of repairs on a lot of kitchen ventilation equipment. It was fun stuff I miss it. I wish I was there helping you Chris. Thanks for your videos

[@burningdust]

Not that I don’t find myself glued to your other videos; I really enjoyed the high detail format, it flows well. Spending 15 years in the field (electrical) I eventually “progressed” to desk jockey I can’t tell you how much I miss working in the field. They say working in the office is safer and easier on the body but having done it now for 5+ years I don’t agree. I think it’s worse for the mind, body, and soul.

[@FrNMGuy]

"HEAT PRODUCING DEVICE"*

[@tyhuffman5447]

Chris - SKF TKBA 40 Red Laser V-Belt Pulley and Belt Alignment Tool I liked this style of video, liked it a lot!

[@MariosACandRefrigeration]

yard stick.

[@HVACRVIDEOS]

I will discuss this on my Livestream this evening 3/27/23 @ 5:PM (pacific) on KZbin come over and check it out kzbin.info1yqPFoBgFdA

[@Granth_Man]

I watch you everyday since I was 10 years old and you made me learn a lot like 3 phase power and the compressors

[@anyheck]

You can also notch the bearing race with the grinder and then strike the cut with a cold chisel to break it open as they are so hard and will be prone to crack if forces are right. Pretty hazardous from the sharp flying pieces of steel aspect, but it can open the bearing race without cutting all the way into the shaft.

[@mesonoxianvisitor]

Really enjoyed seeing the whole process :)

[@I_am_Allan]

Chris really knows how to rub that shaft clean.😉🤣

[@restaurantandcommercialkit6113]

I enjoyed seeing your tech. And you working with him.

[@tobyoverton_hvacr]

Thanks for the great video. Replacing exhaust fan bearings has always been a bit intimidating for me, especially on those supreme grease blaster exhausts. Those things weigh a TON.

[@cliveramsbotty6077]

dude you're breaking my heart smashing that nice screwdriver about with a mallet

[@jamesonconde6624]

Good stuff. I enjoy these videos. I have no idea what you’re doing but I like how you explain everything you do. Gives me a better understanding of your job. I like how detailed you are and I can tell this is how you do it outside of the camera.

[@xiar5546]

On that heating part. As long as the 2 materials are different you can heat them both. One will expand slower than the other. Ideally. The bearing in this case. You probably could’ve hit the whole area as hard as you wanted with the torch cause you arent gonna heat that shaft up enough to expand as much as the bearing.

[@Mr89netrom]

Slight correction. It is not the sentrifugal force you are using to get it of. It is the mass of the wheel and thusly momentum you are using. I have used the same teqnuicke to snug up wheels on cars (yes I always go over them after the car is on the ground) but to get it sort of tight, it works. And to loosen too if it is not too tight.

[@Mr89netrom]

This is also why impact guns are so effective on wheels, even if it is off the ground. You hit it to loosen, it is so fast that the inertia of the wheel keeps it still enough to loosen. Or tighten.

[@cliveramsbotty6077]

english?

[@snoopyjc]

* centrifugal

[@russellhltn1396]

I think the term you're looking for is "angular momentum". Something heavy wants to keep running at the same speed (full stop is also a "speed"). That applies to straight line motion as well as turning motion.

[@BamaRailfan]

@@russellhltn1396 the correct term should actually be kinetic energy. Angular momentum is the resistance of a spinning object to changes in its plane (moment) of rotation.

[@DedmenMiller]

8:14 that's inertia, not centrifugal force. Centrifugal force is going from center outwards, basically pulling the fan blades apart, away from center. Inertia is a mass object wanting to keep it's current velocity, which is what you're using there

[@MrAdamd83]

Good job chris I use to have too change pillow block motor bearings all the time when I work as an industrial maintenance man for 10 years. We had to freeze bearings sometimes to remove them

[@MegaTimothy88]

The American measurements always make me lol could just say 77mm or whatever the conversion was from football fields to logic.

[@stevenhorne5089]

Knowing the environment you usually work in, I'm certain you were plenty happy you needed to wear a sweatshirt on the roof. Trust me, I know, I live in Daytona Beach. I'm trying to get everything done outside before the heat of summer shuts everything down.

[@peterwhite9546]

There is a fan on something at one of the buildings next to where my grandmother lives now which you can literally hear not only 3 blocks away but half way across town.

[@whatevernamegoeshere3644]

I really appreciate the honesty of banging and anger lol. It's a day like that sometimes and no techie is alone with that. Extra relatable after Thursday's late night job

[@justme5384]

Like this style of videos (as well as the others you do)

[@larrysmith8281]

I love your videos

[@joshuabest100]

Question why didn't you undo all the bearingparts and hit the shaft down to break it off the bearing insides

[@NatureIsMyFriend]

Love the videos. But earplugs guys! Save those ears, tinnitus sucks

[@danpresson]

Awesome video bottom bearing was a pain I like how you explain everything

[@chrisconklin873]

That was impressive. I haven't had to do that in years and always hated it.

[@Kueh44]

There's an easier way to remove that bottom bearing or other bearings. Remove the bearing shield. Break the bearing race by punching, drilling, or prying. You can remove the bearings which will allow you to remove the bearing flange and outer race. You can then remove the inner race in whichever convenient method that your prefer. I have used this method many times. Hmmm, you might want to invest in a set of pulley/sheave pullers. Perhaps some laser pulley alignment too. Though old school methods are always good to learn. Just rewatched the video. On the taperlock, there will be two other holes, threaded. These are used to disengage the taperlock from the pulley. Just re-rewatched that section. Looks like there are no holes. My mistake.

[@89dhvac]

Chris, you have A LOT more experience than I, so this is an honest question. Shouldn’t the adjustable pulley be as close to the motor body as possible to cause less wear on the motor bearings? I have been taught that having it out so far acts like a lever against the bearings….great video as always!

[@jasonjohnsonHVAC]

You are correct, but proper belt tension and alignment of the pulley will negate most of the potential damage. Technically speaking an adjustable pulley should only be used to get the proper airflow setting, then a fixed pulley would be installed.....this is mostly not the way it goes. Dont get caught up in all the technicalities. Do your best and let the chips fall where they may. By the book is great theory....but seldom reality.

[@HVACRVIDEOS]

@89DHVAC ideally yes the motor pulley should be closer but as i said in the video I had to move the pulley up in order for the set screw to hit the bottom of the key, the notch for the key did not go low enough on this particular motor

[@zachstammen9337]

Question did you quote a direct replacement or did you also look at a different option fan with a curb adapter?

[@ryanmalin]

he answers all that at the end of the video

[@HVACRVIDEOS]

@Zach Stammen I quoted a direct replacement, an aftermarket fan would have required extensive cutting of the Supreme fan base

[@vicgewondjan647]

Great stuff Chris! I really like the way you made this video.

[@riffraffselbow]

I really appreciate seeing the entire overhaul on something like this, start to finish. You could trim some of the process of unsticking the old bearings, but I can also just scrub forward in the video if I don't want to watch it.

[@douro20]

I could understand $6k...but $20k? They must not be in regular production anymore.

[@YuShudNoe]

Appreciate you showing us how you got through all that! I’ve never had to replace those bearings….. yet! 😂

[@tracysellman1562]

Chris good job, wow! we used to get those fans back in the old days of the late 1990s for $ 1,500.00 - $2,500.00, I almost spit my tea out my nose laughing so hard when you said they cost $20K I was like WTF. lol Maybe you in the wrong business and need to start thinking about building commercial rooftop fans? lol there can't be more than $2k in parts and sheet metal that is a heck of a big profit margin. :)

[@LeewardStudios]

Throw a bead of weld around the bearing. It will expand and let you pull it with ease.

[@stevenhughes6548]

I have always used a Proto wheel puller to remove blower bearings, quick and simple. The arms bolt together and the reach is about 18” to 20”. No cutting, no heat. I’ve had mine for 45 yrs.

[@arska6383]

I am not sure if there was any bearing noise when starting the fan or if it was just the vibrations those squirrel cage motors make before reaching the speed with load having some inertia and direct start. It has something to do with the rotating magnetic field interacting with the rotor bars as it accelerates.

[@ahmedalyami1014]

Nice work Mr Chris 💪💪

[@PuddinJr1993]

Have a great week guys

[@EnderMalcolm]

Coming back to this after a "Simple sink repair" turned into replacing the whole sink XD. The strainer baskets have nuts holding them on, and all the teeth sheared off, so there was no way to remove them. Entire reason for the repair in the first place is that the original installed didn't line up the pipes correctly, and there was weird strain on the couplers. One sheared in half and the drain didn't hold water any more. Rather than try to line the pipes up, which literally just took loosening the couplers and wiggling them a bit, *They wrapped coat hangers around the PVC to try and compress it*

[@erniemathews5085]

Pardon. I thought I had subscribed- this is interesting and well presented. Now I'm a registered fan (har har).

[@throttlebottle5906]

fun! fun! almost as bad as cleaning the whole hoods and vents or grease covered vehicle, where you have your arms wrapped around everything to the arm pits. I've literally had grease in my arm pits and down my sides before. 😳🤢

[@dfwhvac]

Really helpful video for someone that has never done a bearing replacement before

[@craigforster9861]

You need to get a OTC bearing separator and a long reach gear puller.

[@petersmart1999]

Get youself some ZEP Orange degreaser

[@jasonjohnsonHVAC]

That stuff works great

[@petersmart1999]

@@jasonjohnsonHVAC And pretty cheap! Whats up bud?

[@jasonjohnsonHVAC]

​@Peter Smart just busy working. We are getting ready for the summertime temps to hit us. Already have no cools coming in. Working on a Daikin air cooled thats giving me hell. Site wasn't piped in properly so its trying to make something work with something thats wrong.

[@petersmart1999]

@@jasonjohnsonHVAC Sounds fun,Daiken just sent a factory guy out to do sensor upgrades on my aor cooled.It was a recall or some shit! I had surgery on Thursday so Im off this week! Had a triple hernia repair done. Im doing great,about 75% already hardly much pain,they did it with Robot .

[@jasonjohnsonHVAC]

@@petersmart1999 glad to hear you are doing well....take of yourself my friend

[@redtails]

Thank you for sharing. Seems that you're fighting with these bearings and with all the dirt & grime nonstop

[@deanchapman6425]

Nice to see you had to wear a light jacket, live in Vegas so know the heat thing. Nice job with explanations for those who needed it. Good video.

[@je9893]

Why not using a wire brush and drill instead of sand paper? Just curious as that would make your life easier, of course you would still have to use sand paper where the wire brush cant fit

[@giavannivigliotti6174]

50/50 mix of automatic transmission fluid and acetone is the best penetrating oil. pop it into a spray bottle.

[@optroncordian7863]

It is not the weight of the wheel, but the mass. And the inertia it introduces to the system. It acts as a low-pass filter for the vibrations.

[@crazyedo9979]

With a small oxy torch you can cut the outer bearing race easily. After this heat the inner race a little red hot and apply one smash with a chisel on the dot. Job done in minutes.😁

[@zekenzy6486]

Great Video. How to change rotation of fan motor ? Thank you for sharing

[@ryanisaacson118]

I liked it this style but i also like the other way im not sure which one i like better. I dont need to see this style on a another identical video to this but not bad

[@raiden-shogun200]

Good video

[@jasonjohnsonHVAC]

Bearing jobs can be frustrating at times and fight you every step of the repair. Changed out many on various types of equipment. Thanks for sharing Chris

[@ehsnils]

Since the whole bearing assembly is removed I would have considered using a chisel to crack the bearing house and bearing races. After all those items are relatively brittle.

[@jasonjohnsonHVAC]

@@ehsnils I've done it that way as well. I've punched all the ball bearings out of the race and was left with just pulling the bearing housing off. Many ways to get stubborn bearings off a shaft. Some days one way will work, when others it wont. Hell ive even used our pipe freeze kit to shrink them to get the new one on too.

[@wades623]

​@@ehsnilsit's because the races are hardened so much

[@BlueNEXUSGaming]

The reason you level off those belts is to reduce maintenance costs because you are otherwise losing exerted energy into fighting against physics; Gravity specifically will cause long-term strain upon your system, causing things to wear-out faster; then again, you've done these jobs over enough time to know these things using your innate senses, because you can track maintenance requests. Your balancing done at around 30:50 shows the way to “get it working”, though you likely want to head out there at some point to actually balance that belt.

[@BlueNEXUSGaming]

I do enjoy your videos, this content helps me learn a lot about AC units; I might ask my local AC technician if they split the coils on double coil units, because that internal section gets filthy; then let them know "because, I'm aware there's smaller tonnage units built with double coils", before asking if they've encountered any residential units with double coils. Learned it from watching this channel, might send 'em this way too.

[@Chris_In_Texas]

Like the format. Keep up the good work sir! 👍🤠

[@reyigo69]

More and more repair not replace. Need an overhaul company.

[@The98deville]

I liked the longer format, kind of a behind the scenes if you will.

[@johnhaller5851]

If I ever have to replace a bearing, this video will help

[@isb170swap8]

As for setting level on the belt and pulleys you can use an app on your phone to match the angle.

[@gelo1238]

Why you didnt use bearing puller?

[@mrtodd3620]

Do you ever use Uber delivery to courier over a part from a vendor instead of going to get something yourself?

[@HVACRVIDEOS]

No I haven't tried that yet, I will discuss this on my Livestream this evening 3/27/23 @ 5:PM (pacific) on KZbin come over and check it out kzbin.info1yqPFoBgFdA

[@snoopyjc]

I was thinking - that fan must be pretty pricey to justify all of that work - but $20K for a fan - OMG!!

[@davidathey7903]

So nice to see other professionals using the side of the mallet.

[@750kv8]

26:49 - Classic jumpscare industrial edition: motors with high starting torque & low inertial load & no soft-starter. Likely connected in delta. Very relatable.

[@nicholasnewell4719]

I like this type of video u should do more like it

[@samuel-myshells8959]

I can feel and sense your pain and frustration trying to take that damn bottom bearing off…. 😭😤😖😂 I would have gone the cut the hell out of it way sooner than you did… hahaha It’s crazy how dirty that equipment gets!… “ preventative maintenance “ really has gone by the wayside lately… probably due to economic and financial stress on your customers… that’s really unfortunate.. Another great video!