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  1. #1
    Join Date
    Dec 2009
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    Southern US
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    504

    Question on shaft travel?

    Was sent to check a YT with some unusual vibration and noise. Met with a sub who ran a vibration test on the machine and I pulled the coupling and checked the shaft alignment. Before reassembling I checked the compressor shaft for side to side travel and with light (hand only) pressure I found the shaft would travel side to side 0.015 each way .030 total and with light pull up (again by hand only) would lift 0.020.

    Seems excessive to me for bearings to allow that much travel and the seal was beginning to seap a little more before the checks but I would like your thoughts and opinions. I of course have run into a wall trying to locate manufacturer tolerances but I have tried before asking here.
    I'm good at making things cold...You can ask my first two wives!

  2. #2
    Join Date
    Aug 2008
    Location
    Philadelphia
    Posts
    84
    what was the low speed thrust reading?
    Do not weep, do not wax indignant. Understand.
    -Spinoza

  3. #3
    Join Date
    Dec 2009
    Location
    Southern US
    Posts
    504
    0.001 with effort.

    I found the info I needed on my old laptop. Travel seemed excessive but while high it is within tolerances. The unit is the smaller of two but is still oversized for the load it it usually runs at and spends a lot of run time at about 1.5 DT.
    I'm good at making things cold...You can ask my first two wives!

  4. #4
    Join Date
    Jan 2008
    Location
    windy city
    Posts
    4,517
    You're at max. spec with (your words) slight hand pressure.
    time to open her up.
    \m/
    original member of the racoon brotherhood

  5. #5
    Join Date
    Dec 2009
    Location
    Southern US
    Posts
    504
    Quote Originally Posted by heavymetaldad View Post
    You're at max. spec with (your words) slight hand pressure.
    time to open her up.
    I'll pass your suggestion on. I would not want to myself as I have not had any formal training on a teardown of this machine. I have the manual an have done a few overhauls on other brands but I am a firm believer that you should admit your limitation.

    On this instance it might be better to wait till warm weather since the second unit is larger and I would hate to see it struggle to run the light loads it would see now or have repeated short cycles.

    Thanks for your input.
    I'm good at making things cold...You can ask my first two wives!

  6. #6
    Join Date
    Jan 2008
    Location
    windy city
    Posts
    4,517
    didn't read (see) low speed thrust,.............. that is under tolerance.
    i'll keep qwiet.
    \m/
    original member of the racoon brotherhood

  7. #7
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,678
    Here is a YT but really don't have full compressor m/n.
    A mind is like a parachute. It doesn't work if it is not open.

    The best part of going to work is coming back home at the end of the day.

    Hard work spotlights the character of people: some turn up their sleeves, some turn up their noses, and some don't turn up at all.

  8. #8
    Join Date
    Dec 2009
    Location
    Southern US
    Posts
    504
    Quote Originally Posted by heavymetaldad View Post
    didn't read (see) low speed thrust,.............. that is under tolerance.
    i'll keep qwiet.
    No No! Speak up loud and often please!

    My skins thick and I will take all the help and opinions I can get. I am well aware I do not have the back ground or experience as a lot of the folks here. I've hung around the background here watching what you guys have to say and it's amazing how many times its saved my butt.

    I have never said to anyone that I'm a chiller mechanic and in fact I tell my employers often that I'm not but I seem to end up working on them a good bit.

    York56 the unit ia a YTH3C1E2-CRJ and the compressor is YDTL-120.

    Got a call at home (on vacation) that the problems are getting worse and its pulling in air qiucker so I will probably be seeing it again next week and it sounds like time to get ready to pull the charge.
    I'm good at making things cold...You can ask my first two wives!

  9. #9
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,678
    Check your email.
    A mind is like a parachute. It doesn't work if it is not open.

    The best part of going to work is coming back home at the end of the day.

    Hard work spotlights the character of people: some turn up their sleeves, some turn up their noses, and some don't turn up at all.

  10. #10
    Join Date
    Dec 2009
    Location
    Southern US
    Posts
    504
    LOL

    Wonder what it would cost to string a dedicated line form Southern US to Some where in New Jersey.

    Simply amazing!
    I'm good at making things cold...You can ask my first two wives!

  11. #11
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,678
    Check your email one more time.
    A mind is like a parachute. It doesn't work if it is not open.

    The best part of going to work is coming back home at the end of the day.

    Hard work spotlights the character of people: some turn up their sleeves, some turn up their noses, and some don't turn up at all.

  12. #12
    Join Date
    May 2008
    Location
    Central Pennsylvania
    Posts
    552
    Quote Originally Posted by BKS60 View Post
    LOL

    Wonder what it would cost to string a dedicated line form Southern US to Some where in New Jersey.

    Simply amazing!
    Yeah '56 is the man! He's got all the insider info. Not sure where your at in the Southern US, but that could be a real long soup can phone!

  13. #13
    Join Date
    Dec 2009
    Location
    Southern US
    Posts
    504
    HA...Thought about it that way.

    He is right at the top of the list aint he. And from what I see (Read) around here it a hell of a list. Been on a number of other sites but you folks smoke em on information and technical help.
    I'm good at making things cold...You can ask my first two wives!

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