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WA320-3 transmission problems

Discussion in 'Wheel Loaders' started by DMC, May 26, 2019.

  1. DMC

    DMC Active Member

    Joined:
    Aug 21, 2006
    Messages:
    28
    Location:
    QC
    Been having a problem with my loaders transmission overheating and sometimes not wanting to move.
    Sometime the loader will start and go in gear just fine. Sometime after starting the loader and putting it in forward or reverse it wont move. I have to rev the motor and it will move slowly, then it will suddenly start moving fine. I changed all the solenoids thinking they weren't working properly, still the same. I changed the relays around and sometime that will work to get it to move. Sometime if I tap on the relays it will go in gear and move.
    But after all of this the transmission will run hot after being used for a little while. Changed the filters, oil, still the same.
    Any ideas. Only thing I can maybe think of its the troque converter pump??
     
  2. funwithfuel

    funwithfuel Senior Member

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    Did you put a gauge on it, have you checked for a sump strainer? Are you using recommended lubricant?

    Any error codes associated with the failure?
     
    mg2361 likes this.
  3. DMC

    DMC Active Member

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    I haven't tried a gauge yet, I have oil flowing through the cooler but I will check the pressure with a gauge. This is a 1996 model and I can only find 3 filters and strainers. I've changed them all a couple of times. At one time when I changed the filters, the little pilot strainer was crushed. I'm assuming from the pressure. I'm using the correct oil and there also I've changed a couple of times.
    Another thing that happens is sometimes when I push the brake the parking brake locks on for a couple of seconds. Very dangerous when traveling. Could a ground or bad wiring be the cause of these problems?
     
  4. funwithfuel

    funwithfuel Senior Member

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    Perhaps your brakes are hanging all the time. You may have just answered all your questions, yourself.
     
  5. funwithfuel

    funwithfuel Senior Member

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    Maybe your brake charging pump is weak, maybe it is starving for oil. I would definitely investigate the brake issue first.
     
    mg2361 likes this.
  6. DMC

    DMC Active Member

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    I'll check that and get back. Thanks, now I'm remembering that when traveling and if I push the brakes to slow down, loader take a long time to get back up to speed. I'll check the brakes. Thanks again.
     
  7. max s

    max s Active Member

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    Canada
    The issue with the parking brake engaging a couple seconds is due to the brake accumulators or the pressure sensors on it. When the accumulators don't hold pressure and you apply the brakes, the drop in pressure in the brake circuit is sense as a malfonction by the pressure sensor and it apply the parking brake. I would start by checking the acc. charge pressure. There is 2 of them, one for the front and one for the rear brake circuit.
     
    mg2361 likes this.
  8. DMC

    DMC Active Member

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    Didn't have time to check much today, but I did start it to move it..Started,waited until the brake pressure built and alarm went off. Put it in forward..nothing, reverse..nothing. 1st 2nd 3rd and 4th in forward or reverse.. nothing. Put in 1st forward and revved the motor full speed,after a couple of seconds the loader slowly started to move. Then all of a sudden it would move in all gears forward and in reverse. This is what happens 90% of the time when I go to use the loader. I parked it again, but I'm sure if I continued the transmission would have gotten hot. Is there a chance ALL of these problem could be caused by the torque pump?
     
  9. John C.

    John C. Senior Member

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    Yes. I would suggest checking the suction piping for loose clamps and leaks. Seen plenty of Komatsu loaders suck air into the pumps. If that checks out you will need to check pressures to narrow down the problems.
     
  10. DK88

    DK88 Senior Member

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    and make sure the inching pedal isnt hanging up. and machine is free rolling.
    if the filter was crushed you may want to put a gauge, typically that shows that pump failure is occuring and since the metal cant pass it plugs and crushes the filter untill a hole occurs then oil will flow and usually wash housing clean after a while.