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  1. #1
    Silver Member Rockin' G Ranch's Avatar
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    Apr 2008
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    208
    Location
    Point Blank, TX
    Tractor
    Kubota L4740 HST with FEL

    Default HST Problems

    HST on my L4740 has not worked right since getting it back from the dealer after an engine replacement. Also had them change the HST fluid and filters. Now I got this in an e-mail:
    "We have ran some test on the tractor. The internal hydraulic pressure on the transmission is low. Book spec shows about, 4950-5680 psi, forward and reverse HST pressure. Actual pressure on your tractor is 2200 psi.

    The transmission HST pump or motor has a failure. We will need to disassemble the transmission and overhaul the HST system to repair. We will put an estimate together for you."

    The HST was working perfect before this work was done. Could they have damaged the HST by performing the other work? What does it cost to rebuild a HST? Thanks.

  2. #2
    Veteran Member nybirdman's Avatar
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    Feb 2009
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    2,126
    Location
    north of upstate ny
    Tractor
    Kubota L4240 HSTC,L3000DT

    Default Re: HST Problems

    Under warranty? I would be contacting the district Rep.Yes they may have damaged the HST and not cheap to repair.

  3. #3
    Super Member crazyal's Avatar
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    Dec 2003
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    5,877
    Location
    Northern Vermont

    Default Re: HST Problems

    I wonder if they will find out why it's bad when they remove it. Nothing comes to mind but if your oil drain was tampered with they may have done something to your HST as well.
    Kubota L4240,Case 580K backhoe, Case 450 Dozer

  4. #4
    Super Member 94BULLITT's Avatar
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    Feb 2011
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    7,301
    Location
    Frederick County, VA
    Tractor
    Kubota BX2360 & L4240 HSTC

    Default Re: HST Problems

    What is wrong with it, under powered? Is it under warranty?

  5. #5
    Super Member texasjohn's Avatar
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    Oct 2005
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    5,401
    Location
    Central Texas, Jarrell
    Tractor
    Kubota 5030HSTC

    Default Re: HST Problems

    an engine replacement and now HST pressure problems?? Man, that's major.

    What happened to require the engine replacement...sure hope it was under warranty?

    You say it was working fine before the work was done...did something happen that not only affected the engine, but HST as well??

    Am assuming that hours on tractor are low....under 1000, more likely under 500??

    Really hard to understand how these kind of failures could have occurred on such a new tractor. Have heard nothing of this sort before on TBN for this or any other kubota HST tractor. Am not a mechanic, thus can't say if engine replacement/work could have caused low HST pressure.

    OK...answered my question....you had extreme misfortune to lose oil drain plug, causing engine replacement need...as discussed in this thread...http://www.tractorbynet.com/forums/k...appened-3.html

    I'm guessing that your HST problem is related to the engine freeze up problem you had.

    Man, you've really had problems...throttle sensor also went bad...gosh, only good news is that you have insurance...hope it helps!!
    Last edited by texasjohn; 09-23-2012 at 04:29 AM. Reason: added info re lost drain plug, etc.
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  6. #6
    Super Member
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    Feb 2006
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    8,316
    Location
    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: HST Problems

    Quote Originally Posted by texasjohn View Post
    I'm guessing that your HST problem is related to the engine freeze up problem you had.
    Could you please develop this a bit. I can see no way that an engine stalling/stopping due to internal issues would affect a trans. To me it comes down to 1 of 2. Oil and filter change, or towing too far in gear.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  7. #7
    Super Member texasjohn's Avatar
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    Oct 2005
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    Central Texas, Jarrell
    Tractor
    Kubota 5030HSTC

    Default Re: HST Problems

    OP had oil plug fall out, engine overheated and seized up. Fixes since have included new radiator, new engine, new throttle sensor, change HST oil and filter. These are what the OP has discussed in TBN threads.

    And, now, HST pressure which was apparently OK prior to oil plug problem is now less than half what it should be. True, it's been a couple of months since engine replacement, but I'm speculating that it would take a while to become convinced there was some sort of HST problem and take it back to dealer. Speculation again, is that dealer simply replaced fluid and filter, didn't at that time test HST psi, and returned it to OP. Seeing no appreciable improvement, back to dealer who looked into it further and has diagnosed low pressure.

    That's lots of speculation, I admit, and, I further admit that it's a little hard to put a finger on relationship between engine seize up and low HST pressure. Nevertheless, somewhere in the process of engine failure, replacement, HST maintenance the problem arose.

    Hard to see how HST maintenance with new oil and filter would cause the problem.
    Not being a kubota mechanic, I can't say if an overheated engine would fry things in the HST as well.
    Nor do I understand the engine/HST interface which certainly was exposed during the engine replacement...I speculate that there is a finite probability that a problem could have been introduced during the engine replacement....full engine replacement is extremely rare...likely this was the very first one that that mechanic has ever done.

    Net is that I feel the OP's pain.....he has a fantastic tractor and thru a set of terrible events he has not been able to enjoy it for months and months.

    I hope he gets this problem behind him soon, that it is the last one to arise, and that he's able to enjoy his tractor failure free for years to come.
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  8. #8
    Silver Member Rockin' G Ranch's Avatar
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    Apr 2008
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    208
    Location
    Point Blank, TX
    Tractor
    Kubota L4740 HST with FEL

    Default

    Just to clear things up here is the entire history:
    1. All was working GREAT until the oil plug fell out, oil drained out and engine froze up.
    2. Dealer came out and winched tractor on trailer (in N).
    3. Full engine replacement and HST filter and fluid change. Also replaced clutch since it was at 50% worn. Found faulty Throttle Sensor.
    4. Dealer delivered it with Throttle Sensor backordered. Dealer said it was OK to use.
    5. I tried to use it but the HST was terrible - would not get out of "turtle" gear and had NO power. Engine ran great!
    6. Dealer picked up tractor a few days later. Replaced Throttle Sensor and all seemed to work driving it around the barn.
    7. Used it for 1 day with HST not holding with foot off pedal. Sometimes could not restart tractor without bumping pedal to put in N.
    8. Tractor went back in "turtle" gear and again lost power.
    9. Dealer picked up again and found HST pressure low.

    So I think the oil plug falling out was vandalism so dealer thinks other things were done to the tractor also. Insurance covered the engine replacement so hopefully it will also cover the HST problem.

  9. #9
    Super Member texasjohn's Avatar
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    Oct 2005
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    Central Texas, Jarrell
    Tractor
    Kubota 5030HSTC

    Default Re: HST Problems

    Thanks for the detail.....all sounds logical although unfortunate in the extreme.

    The good news is that you and your dealer seem to be working thru this and the dealer and insurance are doing their best to resolve the problem quickly for you.

    I commend your tone of reasonableness..... so refreshing and what I expect on TBN....I really hate the rancorous posters who rail at their dealers without sufficient reason, to my way of thinking.

    I think this is all going to work out properly in the end and you will have a super tractor to enjoy for years!
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  10. #10
    Super Star Member
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    Mar 2009
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    16,222
    Location
    Missouri
    Tractor
    Kubota, John Deere, Case, Massey Ferguson, Ford

    Default Re: HST Problems

    Quote Originally Posted by texasjohn View Post
    Thanks for the detail.....all sounds logical although unfortunate in the extreme.

    The good news is that you and your dealer seem to be working thru this and the dealer and insurance are doing their best to resolve the problem quickly for you.

    I commend your tone of reasonableness..... so refreshing and what I expect on TBN....I really hate the rancorous posters who rail at their dealers without sufficient reason, to my way of thinking.

    I think this is all going to work out properly in the end and you will have a super tractor to enjoy for years!
    Agree,, so much better than the "I'll never buy another kubota, Kioti, John Deere etc." so often seen.
    Thread on helpful tractor abbreviations: http://www.tractorbynet.com/forums/o...-acronyms.html

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