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973 quit moving

Discussion in 'Track Loaders' started by gwhammy, Jun 25, 2022.

  1. gwhammy

    gwhammy Senior Member

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    Talk about bad luck, I was cleaning up a brush pile today with the 973 I bought last fall. Everything was working great then I heard a loud pop and felt it then the machine quit moving. I'm guessing it broke the drive between the motor and pumps. The hydraulics still work which drive off of the gear case on the back of the motor. I've put a whole two hours on this machine since I bought it.
    This brush pile is on property we built a 18 acre lake on about five years ago. I blew the motor up on my other 973 and the 963 on this lake. To top it off my 322 exc. burnt on this lake also. I think this spot is haunted for me.
     
    DMiller likes this.
  2. CM1995

    CM1995 Administrator

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    Damn GW did you dig up any bones around the lake??:confused:
     
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  3. Cmark

    Cmark Senior Member

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    Are you sure you've not blown a transmission hose? I've never seen a pump drive fail. The implement hydraulics work off the tank under the front cover..
     
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  4. gwhammy

    gwhammy Senior Member

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    It was a big bang and you could feel it threw the machine when it did it. I've blown drive hoses before and never felt them break. I'm going by there tomorrow and look at it. This a 96 model so yes it does have a separate hydraulic supply from the hydro stats. I didn't see any oil leaking when I looked under it but I was not very happy at the time and didn't hang around.
     
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  5. Dave Neubert

    Dave Neubert Senior Member

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    I think you could pull the charge pump and see if the drive is turning
     
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  6. gwhammy

    gwhammy Senior Member

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    Talked to a mechanic buddy and he thought the charge pump might have broke or it could be the drive shaft but he's never seen one break. He was going to look at his books when he got to the shop today.
     
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  7. gwhammy

    gwhammy Senior Member

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    Talked to him today, he thinks the female coupler that bolts to the fly wheel probably gave up. Any way about it the motor has to come out.
     
  8. Dave Neubert

    Dave Neubert Senior Member

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    should of looked at the SIS it looks like your drive coupling is most likely the culprit the one I looked at has a plastic drive I have had problems with those in skid steers
     
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  9. gwhammy

    gwhammy Senior Member

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    Sometimes I wonder why I battle these machines. This one down, I was running the older one on a pond and boom. Hydraulic leak!! Looked at it and figured it was more than a shade tree fix. Took it to shop and after 1 1/2 hours washing finally figured it was the hose from valve body crossing behind the oil tank to the bulk head on the other side to the lift cylinder. Another hour of me and a mechanic buddy hammering on it in the heat we had to take both hoses off. Only 102 degrees in the sun but the wind was blowing. Hopefully cooler in the morning putting it back together. I'm getting to old for this shat!
     
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  10. gwhammy

    gwhammy Senior Member

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    So you thrash on it with a mechanic and get it going and move it to the job late in the afternoon. Rains 3 to 4 inches that night!!! Life is great if you can stand the pressure!!!! So I work 2 paid hours all week but the cold beer still tastes good on a Saturday evening setting on the patio!!
     
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  11. Adam Walden

    Adam Walden Member

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    I just rebuilt all the hydraulic drive system on a 963 bbd suffix, the drive pump on he right side self destructed and pushed metal and pieces of bearings out of he pump and through the hydrostat system, I found all the failur in he filter but I still had to go through all the hydraulics and check for metal, while they are separate systems they still work off the same oil and same tanks
     
  12. Welder Dave

    Welder Dave Senior Member

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    That must have been costly! Cmark posted some pics. a couple years ago of what all went wrong and how to properly clean up a hydrostat loader. I think it was 963 too. Everything had to be taken apart and cleaned, everything!
     
  13. Adam Walden

    Adam Walden Member

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    yeah it run him pretty close to a hundred grand, after parts and labor
     
  14. Welder Dave

    Welder Dave Senior Member

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    I'd guess the rest of the machine was in pretty good shape to spend that kind of money on it. If the machine is older and doesn't have DEF or too much electronics might have been the best way to go over buying a new machine.
     
  15. Cmark

    Cmark Senior Member

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    When discussing Cat track-loaders It's important to compare apples with apples. The C series and later are a completely different animal to the first generations.
     
  16. gwhammy

    gwhammy Senior Member

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    First generation runs a separate tank for the hydraulics and hydro stats. Better systems I would think.
     
  17. Welder Dave

    Welder Dave Senior Member

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    Which are more reliable?
     
  18. Adam Walden

    Adam Walden Member

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    I don't remember how old it was, I know it was a C model and a bbd serial number so its not to old,, the engine was a 3126 I think it only had maybe 8,000 hours,
     
  19. Adam Walden

    Adam Walden Member

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    Seeing that you can't even get parts for a HPCU anymore, reliability got replaced with availability, that and not alot of people know how to work on HPCU anymore
     
  20. Cmark

    Cmark Senior Member

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    It's debatable. With correct maintenance, the early HPCU machines give good service. The early C series suffered from drive pump failures and parts are hard to get. Also like a lot of electronic controlled machines, they suffer from bodgy wiring repairs and people tampering with them in ignorance. The first D series machines are now starting to get some big hours on them but appear to be holding up pretty well.
     
    Welder Dave likes this.