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  1. #21
    Elite Member
    Join Date
    Apr 2000
    Posts
    3,701
    Location
    Grayson County, TX
    Tractor
    Kubota B2710

    Default Re: Power Steering Problem Not Solved

    Thanks Steve. Although the problem occurs mostly when using the rotary cutter it also happens with the box blade when transporting in high range. If there is anything I could change to eliminate the problem believe me I would do it. By the way, the last time my dealer saw my place was on delivery day, and he has not offered to come to my place to find the problem.

    When I mow the tail wheel definitely has some weight on it and goes in a straight line until I turn, although it will come off the ground and twist around on ueven ground.

    If you're saying that what I feel is the tailwheel binding on uneven ground then I can tell you that's not what it is. If I'm doing something that is starving the hydraulics I can buy that, if I could only figure out what it is. To my knowledge the dealer has not readjusted anything on the cutter when the are "testing" it.

    I set the cutter up per Rhino specs - that is, the tail wheel is on the ground but is not holding up the entire weight of the cutter - there is about 2" of up/down play in the front to allow for uneven ground. The front of the cutter is about 3/4 inch lower than the rear. So, yes, the tractor is holding the cutter up off the ground somewhat, but the wheel is always on the ground on smoot terrain (most of what I mow is relatively smooth). While mowing sometimes I notice the leading left and right edges of the cutter start digging into the ground. I raise and lower the cutter and its stops digging in for a while. I think the 3PH is leaking down slightly so I have to raise it up every now and then. It has always done this and has not concerned me, and raising it so that it doesn't dig in does not fix the steering issue.

    The other thing is that the steering works perfectly until the tractor gets hot - that is about 1/2 the way up the heat guage, so the way the cutter is set I don't believe is giving a mechanical effect to the way the steering feels, but could only be contributing to a hydraulic problem.

    The dealer replaced the steering assembly and showed me the old one - it has screw like thing in it. Of course I don't know if they lubricated it interally or not.

    Yesterday I used the cutter an hour, then took a couple hours off, then mowed another hour. No power steering problems whatsoever. It usually takes 2 hours before it shows up, and sometimes longer.

    I have often wondered if the frequency of turning on my place causes it to fail at my place but not at the dealers. The field the dealer uses to mow is very flat, very large and rectangular with no trees. Not much turning at all. My field is odd shaped, has some holes, several trees to dodge, etc.



    Alan L., TX

  2. #22
    Elite Member
    Join Date
    Apr 2000
    Posts
    3,701
    Location
    Grayson County, TX
    Tractor
    Kubota B2710

    Default Re: Power Steering Problem Not Solved

    Art, thats a good idea. At least it would prove it is heat related if it fails quicker.

    Alan L., TX

  3. #23
    Gold Member
    Join Date
    Jan 2001
    Posts
    408
    Location
    North Carolina, USA
    Tractor
    Previously: Kubota B2710. Now Deere 3520

    Default Re: Power Steering Problem Not Solved

    Alan,
    Had to do some brush cutting yesterday. It only gets above 85 here in VT on rare occasions, and yesterday was only 78-80 tops, with a nice breeze. Figured I try to duplicate your problem just the same, so did some normal cutting in M at 2500 for an hour, then did some heavy cutting, same settings, but had to back the cutter between trees in soft ground, so was doing pseudo K turns in the mud for a good 30min. Full turn to right then left forward, raise cutter and back it in, drop cutter and drive it out, raise cutter, right left...No steering problems. Temp gauge only went to 1/3up. Went along the drainage creek, can't see the drop off so did that for 150yards doing the same thing, then went and cut some more field in an expanding figure of 8 pattern. Couldn't create your problem.
    Guess I can't offer any help in deciding if it's the temp, or the tractor, but I can say that the 3pt hitch should not leak down. You have position control, so if it did start to "leak down", the position sensor would trigger the hydraulics and lift it back up. Unless your lift control isgetting moved. If it is "leaking down", then clearly there is something wrong with your tractor hydraulics, and maybe the lift leak and the steering problem are related!
    Good luck, and let us know what happens.
    Todd


  4. #24
    Super Member ronjhall's Avatar
    Join Date
    Apr 2000
    Posts
    7,599
    Location
    SE Michigan, AZ when its cold in MI.
    Tractor
    Kubota 2910 HST

    Default Re: Power Steering Problem Not Solved

    Kubmech
    <font color=blue>FEL installed, try mowing with FEL removed, see if there's a difference.</font color=blue>
    It does not make a difference. Mid Mount mower without FEL. Rotary Cutter with FEL.
    <font color=blue>What tires are you running.</font color=blue>
    Turf tires.
    <font color=blue>When the steering acts up (when loader installed) lift the front end off the ground and see if steering changes.</font color=blue>
    FEL and 3PH work normal.
    <font color=blue>When acting up, slowly turn steering wheel one way, then the other. Any difference? any noise or buzzing?</font color=blue>
    Buzzing at 1000 RPM’s and hard steering. At higher RPMs get no power steering at times.
    <font color=blue>If possible, check ps pump temp, and trans fluid temp.</font color=blue>
    210 degrees
    <font color=blue>Pull the trans dipstick note if there's any oil foaming.</font color=blue>
    Thought I saw foam on dip stick. But next time I checked did not see it.
    <font color=blue>Is your 3PH in the fully raised position?</font color=blue>
    Problem shows up with 3PH around 4 to 5. Just need to get Hydraulic oil hot.
    <font color=blue>Has anyone had the problem while not mowing and/or with mower removed? Belly or rear mount.</font color=blue>
    I have had problem show up while using implements that do not require PTO.
    <font color=blue>In 4x4 or 2x4? any difference.</font color=blue>
    It does not make a difference.
    Hope this give you some indication of problem.




  5. #25
    Elite Member
    Join Date
    Apr 2000
    Posts
    3,701
    Location
    Grayson County, TX
    Tractor
    Kubota B2710

    Default Re: Power Steering Problem Not Solved

    Well if the leaking down is a problem I guess I'm screwed because I've never mentioned it and my tractor is out of warranty. The only time I notice it is when using the cutter and it gradually starts digging into the ground. I will give the dealer this bit of info in case it helps diagnose the steering problem.

    Alan L., TX

  6. #26
    Elite Member
    Join Date
    Apr 2000
    Posts
    3,701
    Location
    Grayson County, TX
    Tractor
    Kubota B2710

    Default Re: Power Steering Problem Not Solved

    I rarely have a problem when the temp is below 90, and don't have complete failure until the temp reaches 97 or so. There might be a lot of tractors being used up north that never will fail because your tractors are not asked to perform in the extreme heat the way ours are down here in Texas. The fact probably is that my problem is rare and I'm just lucky to have it with my tractor.

    Alan L., TX

  7. #27
    Veteran Member
    Join Date
    Aug 2000
    Posts
    1,591
    Location
    Western Connecticut
    Tractor
    2003 Kubota L3430

    Default Re: Power Steering Problem Not Solved

    My cutter goes down and starts to dig in, but it's because my toplink unscrews from the vibration and gets longer and longer.


  8. #28
    Super Member
    Join Date
    Apr 2000
    Posts
    6,293
    Location
    central New York
    Tractor
    all makes and models

    Default Re: Power Steering Problem Not Solved

    I do believe the heat might be a factor but it goes between the two pieces I mentioned as in the service manual for trouble shooting it gave the relief valve and control. I think it is the relief valve as that could give you a varing condition.


  9. #29
    Platinum Member
    Join Date
    Jun 2000
    Posts
    676
    Location
    Central Mississippi, USA
    Tractor
    Case-International 385, Kubota L5450 w/LA1150A loader

    Default Re: Power Steering Problem Not Solved

    What am I missing here?? Alan says that when he is using the cutter it starts digging in the ground. Doesn't the 2710 have position control? Shouldn't the Position control keep the implement at the desired height? If the implement gradually lowers into the ground, the whole hydraulic system must be failing. Alan, If you stop your engine with the 3 point in the up position with an implement on it does it creep down? If this is an extreme problem that keeps the pump pumping oil under pressure all the time it could be the cause of his oil overheating. 210 degrees is WAY too hot IMO.


  10. #30

    Join Date
    Jun 2001
    Posts
    66
    Location
    Jordan NY USA
    Tractor
    Kubota B8200 HST 4WD

    Default Re: Power Steering Problem Not Solved

    the internals of the power steering box and outlest of the pump. May have been made too big. Causing them to expand when hot and starving the unit of oil. Just replace the pump and steering box. that should work. Had it happing on aircraft

    Alex (B8200/HST/4WD/FEL/MidM/Tiller<P ID="edit"><FONT SIZE=-1>Edited by b8200hst4wd on 07/09/01 09:10 PM (server time).</FONT></P>

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