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Thread: YK motor grease

  1. #27
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    I know this is an old thread, but....what hppened with the bearing issues?

  2. #28
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    Quote Originally Posted by IGBTech View Post
    I know this is an old thread, but....what hppened with the bearing issues?
    I'm guessin you're talking to me? They finally got it resolved. Turns out they were talking to the motor manufacturer and that's where the bearing specs were coming from. They finally put a call in to York and they gave them a spec for a looser bearing. Been running ever since. Some of you more experienced guys can chime in, but I'm pretty sure there are different classes of bearings with different speed ratings. The faster speed the looser the bearing to take up for heat expansion? Maybe?

  3. #29
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    The bearing type used in the motor is stamped on the nameplate. I've changed a bunch of them and bought a standard across-the-counter bearing per the type stated and never had a problem. The only thing that's "loose" would be that the rear bearing floats with the expansion of the rotor. If that float is missing due to improper machine work on the bearing housing during repair, then you will most definitely have problems.

  4. #30
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    Quote Originally Posted by klove View Post
    The bearing type used in the motor is stamped on the nameplate. I've changed a bunch of them and bought a standard across-the-counter bearing per the type stated and never had a problem. The only thing that's "loose" would be that the rear bearing floats with the expansion of the rotor. If that float is missing due to improper machine work on the bearing housing during repair, then you will most definitely have problems.
    I've changed a few myself, and had similar results as you. But I've also had some dealings with other types of machinery and found bearings that were made differently. Pretty sure there are speed ratings on most bearings. Somehow those einsteins got ahold of the wrong variety. Don't ask me how. But I was standing next to the chiller the last time it let go and pushed the stop button when the smoke rolled. Then I watched it start up after the bearings were changed. Still running to this day.

  5. #31
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    Maybe the problem was on the other side of the counter where the bearings were bought?

  6. #32
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    I know this is an old thread. The Texaco Premium RB (a lithium complex) has now been shelved as obsolete by Chevron Lubricants. Chevron Lubricants recommends purging the bearings of old grease and using Chevron SRI 2 (a shear-stable polyurea).
    I know a few Chiller guys that use LPS ThermaPlex (also a lithium complex) in place of Texaco Premium RB.

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  8. #33
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    We as a company use this

    UA Proud

    "Phfft! Facts. You can use them to prove anything." Homer Simpson

  9. #34
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    Quote Originally Posted by MechTech2013 View Post
    I know this is an old thread. The Texaco Premium RB (a lithium complex) has now been shelved as obsolete by Chevron Lubricants. Chevron Lubricants recommends purging the bearings of old grease and using Chevron SRI 2 (a shear-stable polyurea).
    I know a few Chiller guys that use LPS ThermaPlex (also a lithium complex) in place of Texaco Premium RB.
    I used Chevron SRI 2 grease exclusively my entire career. It is one of about 2 or 3 lubricants that York approved. If I remember correctly lithium based greases were not approved. You cannot go wrong with the Chevron SRI 2 grease.

  10. #35
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    Quote Originally Posted by KnewYork View Post
    YI used Chevron SRI 2 grease exclusively my entire career. It is one of about 2 or 3 lubricants that York approved. If I remember correctly lithium based greases were not approved. You cannot go wrong with the Chevron SRI 2 grease.
    The Reliance Motors 790 HP and up were the exception to that rule, they were very specific in only using Texaco Premium RB Lithium Grease which does not mix well with Polyurea grease.
    Attached Files Attached Files

  11. #36
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    uploadfromtaptalk1441505790798.png
    This Timken chart says Lithium Complex (Texaco Premium RB for example) and Shear-Stable Polyurea (Chevron SRI 2 for example) are compatible.

  12. #37
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    Quote Originally Posted by nyrb View Post
    The Reliance Motors 790 HP and up were the exception to that rule, they were very specific in only using Texaco Premium RB Lithium Grease which does not mix well with Polyurea grease.
    Correct. I didn't mention the exception as the Reliance motor never showed up on any job or start up I ever performed.

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