Post a reply to the thread: Blower bearings Trane yhc120a rtu. Easy???
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Originally Posted by jeffdurbin77 Check out this video for a new tool called the bearing buster. It makes removing old bearings easy. Just follow this link. https://www.youtube.com/watch?v=8BBjzTZqWko Looks more like a knuckle buster to me. :grin:
Attachment 348711 Here is a fun one I'm on today. Pool dehumidifier 10ft off floor with compressor right by bearing that needs to come out. OP have any luck?
Originally Posted by billymons WOW That did a number on that shaft! Yes that looks like it. The center of the blower wheel looks like two cone discs welded together, hollow in the middle. Ya the support bracket welds broke and that shaft was riding that bracket and just about cut in all the way thru. Made a ton of noise!! Wink! I have seen that style blower come loose in the middle where that two halfs meet and make a ton of noise. I assume there is no debris on the fan wheel throwing it out of balance. I bet u had either a weight come off, over tension of belt, or bend shaft, and probably last that the blower wheel split in the middle where u can not see it. Sent from my BlackBerry using Tapatalk please excuse typographical errors
Originally Posted by billymons WOW That did a number on that shaft! Yes that looks like it. The center of the blower wheel looks like two cone discs welded together, hollow in the middle. Don't drive those wheels off the shaft if you think your reusing it
Originally Posted by luv2cruiserccl does your unit look like this? WOW That did a number on that shaft! Yes that looks like it. The center of the blower wheel looks like two cone discs welded together, hollow in the middle.
Originally Posted by luv2cruiserccl Could use a dial indicator and check to see if that shaft is bent as others stated. This the type that the two half's of the blower wheel are welded together? if it is that style then I have seen them break apart. Sent from my BlackBerry using Tapatalk please excuse typographical errors does your unit look like this?
Also see if the hub hasn't spun in the wheel. It may be out of center. I had one do that on a 15 ton Voyager and it would shake the whole roof.
Originally Posted by billymons Ok the belt tension is ok per spec. What I did do is switch out the motor with a nice quiet similar unit that was on the same roof. This motor also vibrated. When I remove the belt on either motor and turn on power,the motor is nice and quiet and not shaky. It's got to be the squirrel cage it must be off balance? I didn't see any missing weights. Although I could only see one side of the cage. It looked good when I had it out, no loose fins no damage. Guess Ill be taken it apart again. Could use a dial indicator and check to see if that shaft is bent as others stated. This the type that the two half's of the blower wheel are welded together? if it is that style then I have seen them break apart. Sent from my BlackBerry using Tapatalk please excuse typographical errors
Ok the belt tension is ok per spec. What I did do is switch out the motor with a nice quiet similar unit that was on the same roof. This motor also vibrated. When I remove the belt on either motor and turn on power,the motor is nice and quiet and not shaky. It's got to be the squirrel cage it must be off balance? I didn't see any missing weights. Although I could only see one side of the cage. It looked good when I had it out, no loose fins no damage. Guess Ill be taken it apart again.
Also forgot to ask how is your belt tension Sent from my BlackBerry using Tapatalk please excuse typographical errors
Originally Posted by billymons I'm going back to it now. I have a feeling the motor is cocked on its mount a little. We will see. Everything is clean. Sorry I forgot about new sheave If u have acess to a sheave laser alignment tool I would use it that will cause vibration. Also u said u had new motor the motor could have a soft foot issue if u loosen one bolt at a time and run and it gets better then soft foot, if the case a shim or washer the correct height will fix. Also on the blower wheel have u lost any weights could be out of balance check and see if u see where one use to be. Sent from my BlackBerry using Tapatalk please excuse typographical errors
I'm going back to it now. I have a feeling the motor is cocked on its mount a little. We will see. Everything is clean. Sorry I forgot about new sheave
Originally Posted by billymons The motor sheave is new. Oh come on Billy you need to tell me these things now my fingers are tired from typing all that. If everything (besides wheel and shaft) is new and tight and lined up. I would tend to think the wheel is out of balance. I have not witnessed many bent shafts unless MAJOR trama has occurred. Did it shake before? Was it clean? If it wasn't clean could dirt have knocked loose making it a little off? Bent shaft can be found quickly, but I am really doubting that is the problem.
Originally Posted by Freightshaker How are your sheaves? If they are worn they tend to pinch on the belts. Worn sheaves will make it shake. Typically they wear out the motor sheave first. Those blowers are not too bad, just like a few have said though, have all the parts on hand incase something goes wrong. It's easier to return them. Trane's bearing retainers are welded together and welded to housing which makes a bearing changeout take a little longer sometimes. A lot of carriers tend to have a similar setup but they use rivets on some bearing supports. I drill them out and put in bolts with thread locker. Had one too may of the rivets fail and drop the bearing, shaft, and fan. The motor sheave is new.
Originally Posted by 2sac Threadserts instead of bolts. They won't come loose and are stronger than the rivits. You would be using them as a rivit, not the threaded portion Attachment 348491 I don't have many bolts come loose that I don't want to. I have not used the threadserts before they look like they would do the job. I have a big nut and blot tray and plenty of flavors of loctite though.
Originally Posted by Freightshaker How are your sheaves? If they are worn they tend to pinch on the belts. Worn sheaves will make it shake. Typically they wear out the motor sheave first. Those blowers are not too bad, just like a few have said though, have all the parts on hand incase something goes wrong. It's easier to return them. Trane's bearing retainers are welded together and welded to housing which makes a bearing changeout take a little longer sometimes. A lot of carriers tend to have a similar setup but they use rivets on some bearing supports. I drill them out and put in bolts with thread locker. Had one too may of the rivets fail and drop the bearing, shaft, and fan. Threadserts instead of bolts. They won't come loose and are stronger than the rivits. You would be using them as a rivit, not the threaded portion
How are your sheaves? If they are worn they tend to pinch on the belts. Worn sheaves will make it shake. Typically they wear out the motor sheave first. Those blowers are not too bad, just like a few have said though, have all the parts on hand incase something goes wrong. It's easier to return them. Trane's bearing retainers are welded together and welded to housing which makes a bearing changeout take a little longer sometimes. A lot of carriers tend to have a similar setup but they use rivets on some bearing supports. I drill them out and put in bolts with thread locker. Had one too may of the rivets fail and drop the bearing, shaft, and fan.
Ok all went well and everything came apart easy. The old bearings didn't seem to bad. Got it back together and it seems better but the motor still shakes when it's running. I don't get it. It has a recent new motor, motor adjusting mount, new blower bearings and belt. I noticed no wobble in the blower when I had it out. What can be causing this motor to be shaking like this? Do these blower wheels go bad, could the shaft be warped? There's not much more to replace???? The only thing I can try is making sure the motor is mounted square with the blower pulley. Any suggestions please let me know.
If the unit needs to be running by the end of the day, I would have a shaft, wheel and bearings on site. If you can get the bearings off without cutting the shaft, you can return the unused parts.
the few that i have done i have always cut the shaft removed the blower, shaft and bearings. it may be heavy on the part side however it does save the customer on the labor side.
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