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Komatsu Dozer Steering Issue

Discussion in 'Dozers' started by Tommy, Sep 27, 2011.

  1. Tommy

    Tommy Member

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    Oct 30, 2010
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    Business Owner
    Location:
    Texas
    My D37P-5A won't turn to the left. When I pull the stick to the left, I can hear it put a load on the engine, but it doesn't turn. The linkage is moving all the way into wherever it disappears into the machine housing. Looks to be the same amount of movement as the right turn makes.

    Also, the angle button on the blade control has quit working.

    Any help or advise is greatly appreciated.
     
  2. JeremiahSr

    JeremiahSr Well-Known Member

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    either the left clutch wont release or the right clutch is not pulling. put it against a pile a dirt and be sure both tracks spin. that will rule out if the right clutch is pulling or not. then, while still locked up to tha pile of dirt, try to steer it both directions. compare the difference watching how the right track goes into neutral. if when trying to steer left the left track is in a bind or doesnt seem to be neutralizing, the clutch isnt being released. thats done with a hydraulic piston on side of clutch cover. could be a bunch of things causing it not to release. but this will at least narrow it down further for you.
     
  3. Tommy

    Tommy Member

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    Jeremiah,

    I'll try what you suggested and let you know. When the left steering "broke" I was going along the side of a trench I was cutting with the blade and the dozer was tilted to the right at a pretty decent angle. Unknown to me, the track adjuster was going out on the left side and the chain went slack. When I realized the chain was slack, I leaned on the stick pretty hard to the left and tapped the brakes to try to get the machine to exit the trench by turning left . I'm not sure why, but it wouldn't turn out of the ditch to the left. Up to that point, the left steering had worked fine. Maybe it was because the left chain had become so slack. I put it in reverse and turned right, then back forward to exit the trench. I've since replaced the seals in the left track adjuster and at the same time replaced the seal on the final drive at the left sprocket.

    Up to the time the track adjuster broke, I'd had the machine a couple of years and hadn't really done anything other than routine maintenance. The steering was perhaps a little weak but basically everything worked fine.

    Thanks for the advise.
    Tommy

    Attached a couple of photos of what I've used it for. road.jpg Dozer in the pond.jpg
     
  4. Tommy

    Tommy Member

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    Both tracks spin against the dirt. Try to turn right and the right track stops spinning. Try to turn left and both tracks keep spinning.
     
  5. RDG

    RDG Senior Member

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    Sounds like LH clutch is not releasing if both tracks keep driving. RDG.
     
  6. Tommy

    Tommy Member

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    So how do you figure out the cause and fix it? I know the linkage is working at least down to where it disappears inside the housing. I can see it moving just like the right side under the seat. You can also hear it lug the engine down a little when trying to turn left. I "fixed" my 82 Jeep CJ's clutch by putting the bumper against a tree, pushing in the clutch and hitting the starter with it in 1st gear. It had been sitting up for about a year when the clutch got "stuck".. Not so on the dozer. I was using it when the steering worked and then all of a sudden didn't anymore. LIke I said earlier, when it happened, I leaned on the stick to turn left pretty hard (not sure why that would make a difference) and tapped the brakes tryiing to get it to turn left when the chain had gone slack. I don't know if that would affect it either. I can't really see how it would.
     
  7. StanRAUUS

    StanRAUUS Member

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    Look to see if there is a inspection cover, release bearing has issues from your’ descriptions and testing.
     
  8. RDG

    RDG Senior Member

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    Have seen a D31-17 snap the end of the clutch throw out fork down inside the steering clutch housing, just went all of sudden. Cheers RDG.
     
  9. Tommy

    Tommy Member

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    Seems like I might have heard it if that happened, but with the loose chain, it may have been trying to jump the sprocket at the time, so I probably would not have noticed. Thanks and I'll check it out and look for an inspection cover.
     
  10. TOM V

    TOM V Senior Member

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    In the last 10 years I have had to replace 2 release yokes on 2 different D31A-17 dozers, I don't think it's uncommon for those to crack.
     
  11. Tommy

    Tommy Member

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    Can't see an inspection cover. It's difficult to see anything but the linkage going in. Guess I'll have to remove the seat. The piston referred to by JeremiahSr above I assume is the piston that activates the linkage on the outside of the clutch. I can see the piston cylinder moving when I steer to the left. I'm guessing it's not supposed to move other than the rod coming out of it and going to the linkage. Maybe it's loose and not allowing the clutch linkage to move far enough to release it. Don't know if you can access it from the back of the machine or by removing the seat.
     
  12. cclark746

    cclark746 New Member

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    I have a D31p-18 will not track right. Just all of a sudden quit, I can here the brake trying to engage when you intitially try to steer right it locks up for a sec then releases and continues to track straight. it will track left with no problems. Any suggestions will help, could this be a brake adjustment issues.
     
  13. cclark746

    cclark746 New Member

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    I will push a pile tomorrow and see if both tracks spin and how it responds during pushing and trying to turn.
     
  14. cclark746

    cclark746 New Member

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    I pushed a pile and both tracks spin fine and it will steer both directions while under a load!
     
  15. Stonemobile

    Stonemobile New Member

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    This is my first post so if I've done something please overlook. Anyway I was wondering if you found problem? I have a d31p-20 that started doing the exact same thing. Thanks for any advice.
     
  16. GAK30

    GAK30 New Member

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    We have a D31p-18 that will not turn left. Turns right fine. Both tracks pull fine and will spin when pushing a pile so I assume the steer clutches are not slipping. When I pull the left control, both tracks stop. I checked the pressure to both steer booster cylinders and get 310-320psi(about 22kg/cm^2) which is correct. I only have pressure on the side being activated (no pressure to the right with the left lever pulled, etc) so I don't see how the right cylinder can be disengaging the clutch. The transmission main pressure is 310-320psi, also ok. This started suddenly when dad was pushing some brush. Anyone have any ideas?
     
  17. GAK30

    GAK30 New Member

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    After thinking about the problem a little more, I had the idea that possibly the bearings supporting the ring gear may be worn or destroyed to the point to allow the ring gear to move side to side. I removed the inspection cover and it does have movement. The ring gear moves left when the left lever is pulled and back to the right when the right lever is pulled. I haven't had the chance to get it torn down but what appears to happen is the left steer cylinder disengages the left clutch but also pulls the ring gear enough to the left to disengage the right clutch also.
     
  18. sgil1220

    sgil1220 New Member

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    houston tx
    i have a similar problem. my D31P20 the tracks wont turn right or left. but it does move foward and back