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Cat 252b right drive motor won't move

Discussion in 'Skid Steers' started by RMMW, Jan 24, 2023 at 1:39 PM.

  1. RMMW

    RMMW Member

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    I am new to this forum and have a repair shop. I mainly work on farm equipment but I have this skid steer that I told the customer I would look at because I assumed that it was a chain problem before he dropped it off. He said that a hose blew on the loader and he lost all hydraulic oil. He replaced the hose and refilled it with oil and used it for about 30 minutes and then the right drive motor quit working. I checked the chains and it all looks good in there. I connected a pressure gauge to the brake on both left and right drive motors one at a time and the pressure was just under 450 lbs. At this point without any guidance, I am stuck. Any help on figuring this out would really be appreciated.
     
  2. Nige

    Nige Senior Member

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    Can you please post a Serial Number. Too many options of 252B out there to go guessing.
    If the customer blew a hose and did not go through some sort of air bleeding procedure after replacing it and refilling the tank with oil he may have trashed a pump or a drive motor.
    Was the blown hose you mention on the RH side motor by any chance.?
     
  3. RMMW

    RMMW Member

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    TNK00353
    The blown hose was on his attachment that he had on the loader. He did say he ran it until he ran out of oil though. Nothing was replaced on the actual skid steer.
     
  4. Nige

    Nige Senior Member

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    That is not good. Prepare for the worst. This could turn out to be an extremely costly lesson for the customer.

    So it is a 252B3. Attached the procedure for checking the hydrostat system - when I can get it to upload that is.......

    You might be well advised as a first step to remove the hydraulic system filter and cut it open to inspect for the presence of sparklies in significant quantities.
     

    Attached Files:

    Last edited: Jan 24, 2023 at 2:51 PM
  5. RMMW

    RMMW Member

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    I agree. Whatever info you can help me to diagnose which is the culprit, would be really appreciated.
     
  6. Nige

    Nige Senior Member

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    See above. I managed to upload the testing procedure plus added the suggestion about taking a look in the filter.
     
  7. RMMW

    RMMW Member

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    While you were posting this I did pull the filter and cut it open. It has a lot more sparkle debris than normal. It is safe to say that something major has failed. I will take a look at your upload and go from there.
     
  8. Nige

    Nige Senior Member

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    Post a photo of what you found please. Did you squeeze a section of the filter in a vise before looking on the pleats.?
     
  9. RMMW

    RMMW Member

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    The oil inside the filter was silver in color. I did squeeze a section in the vice and it does have sparkles in the pleats. The oil being squeeze out of the pleats in the vice was metallic in color also.
     
  10. RMMW

    RMMW Member

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    The first 2 pics are of the pleats. The third is the oil out of the filter. The last pic is all of the metal settled into the bottom of the filter.
     

    Attached Files:

  11. RMMW

    RMMW Member

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    Off of the information that you gave me, the charge pressure and the speed sensing pressures are within specs. Am I safe to assume that it is the drive motor that has gone bad?
     
  12. Nige

    Nige Senior Member

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    It certainly sounds that way.
    Before condemning the drive motor I'd like some confirmation from someone who works on these machines on a daily basis though.
     
  13. 92U 3406

    92U 3406 Senior Member

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    If there's a speed sensor on the motor, pull it out and check it. Its magnetic so if the motor has piled up you will likely see chunks stuck to it.
     
  14. RMMW

    RMMW Member

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    There is no speed sensor on this motor. Also, there is nobody even remotely close to me that could look at it. Our closest dealer is 2 hour drive in either direction. I'll pull the drive motor out tomorrow and take it apart to see if I can find some internal damage. I will report back tomorrow. Thanks for all your help!
     
  15. Nige

    Nige Senior Member

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    Check the attachment. There is not much in the way of parts available for that motor. If it's not listed - it's not available as a spare part.
    Another clue that popped up in a search is that there is no D&A procedure for the motor, no specifications, and no Reman motor. All of those are indications that attempting to repair motors is not advised because the guts will probably be trashed.
     

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