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  1. #21
    Platinum Member
    Join Date
    Dec 2000
    Posts
    960
    Location
    Tescott, Kansas
    Tractor
    Kubota L5740/cab with air ride seat

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    sounds like the stall guard is haveing issues to me.
    Kubota L5740 with Air Ride Grammer Seat,cab,Hyd top link, LA854 loader, LA2184 front blade. Kubota RTV 900 Camo. 04 Dodge/cummins-6 speed with extras

  2. #22
    Veteran Member David_Kb7uns's Avatar
    Join Date
    Aug 2005
    Posts
    1,057
    Location
    Willamette Valley Oregon
    Tractor
    Kubota X 4

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    Quote Originally Posted by DDT View Post
    sounds like the stall guard is haveing issues to me.
    There is no stall guard on the 30 series Ls.

    David Kb7uns
    Grand L3130GST LA723 Loader, ATI grapple, ATI grapple bucket, WR Long front remote, Kubota rear remotes, Bradco 408 Backhoe with thumb, 60"KK brush hog, 60" RM Finish Mower, Speeco Post Auger, 72" KK rear blade, 60" box blade
    BX2230 LA211, RCK60, GCK60 Bagger,42"Land Pride Tiller, XB BB, XB RB, rake, Fimco 3PT sprayer
    G2160 RCK60 Mower
    RTV1100 Orange, Work Lights, Front Rear Winch,Rear Screen, High Mount air cleaner, water seperator
    2010 Polaris RZR 800 S
    2007 CAN AM Outlander 800 LTD

  3. #23
    Super Member texasjohn's Avatar
    Join Date
    Oct 2005
    Posts
    5,270
    Location
    Central Texas, Jarrell
    Tractor
    Kubota 5030HSTC

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    I got it fixed.....

    I saw in the shop manual that there is something called a tachometer sensor (electronic)....hmm....hunted it down, just under the stop engine solenoid and in same area as all the fuel injection stuff, hidden under a rubber protective shield. I unplugged it, dusted it off/blew into both sides of the connector and reconnected it. My impression was that the connector had been properly seated and not too dusty. Nevertheless, I gave it a try...not really expecting to have resolved the problem. However, it started and ran like a top under load.... I sat on it all day yesterday pulling the disk.

    I don't know about a stall guard, but it would drive, very slowly, with the tachometer sensor disconnected.

    I didn't see any error code on the intellipanel, but will admit I didn't study it, but did drive it for probably 10 minutes very slowly back to the house while watching the MPH on the intellipanel. Thus, likely I would have seen an error code if one were present.
    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

  4. #24
    Elite Member
    Join Date
    Sep 2003
    Posts
    4,144
    Location
    New Brunswick, Canada
    Tractor
    Kubota L5030 HSTC, MF 5455

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    The tach sensor is not part of any electronic engine management. It must have to do with some safety function in the intellipanel safety logic. It doesn't control anything in the engine.

  5. #25
    Veteran Member David_Kb7uns's Avatar
    Join Date
    Aug 2005
    Posts
    1,057
    Location
    Willamette Valley Oregon
    Tractor
    Kubota X 4

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    The TACH SENSOR is for RPM only for the Intellipanel, the only Electronic Control Unit that these tractors have is for the Glide Shift Transmission. Cleaning the Tach Sensor has no effect on engine. It only tells the intellipanel how fast the engine is turning and the PTO speed.
    Get a sevice manual and read it so that you can get a full understanding of the systems on the tractor, it is worth the money for the time it saves.

    David Kb7uns
    Grand L3130GST LA723 Loader, ATI grapple, ATI grapple bucket, WR Long front remote, Kubota rear remotes, Bradco 408 Backhoe with thumb, 60"KK brush hog, 60" RM Finish Mower, Speeco Post Auger, 72" KK rear blade, 60" box blade
    BX2230 LA211, RCK60, GCK60 Bagger,42"Land Pride Tiller, XB BB, XB RB, rake, Fimco 3PT sprayer
    G2160 RCK60 Mower
    RTV1100 Orange, Work Lights, Front Rear Winch,Rear Screen, High Mount air cleaner, water seperator
    2010 Polaris RZR 800 S
    2007 CAN AM Outlander 800 LTD

  6. #26
    Super Member texasjohn's Avatar
    Join Date
    Oct 2005
    Posts
    5,270
    Location
    Central Texas, Jarrell
    Tractor
    Kubota 5030HSTC

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    Am the OP, Have service manual and read it.
    That's how I found the tach sensor.
    I did one thing and one thing only, reseated the connection right at the sensor.
    Problem solved.
    Am convinced that some relationship exists between sensing RPM's and the stop solenoid such that at extremely slow HST speeds the solenoid is allowed to be open, but when more speed is requested at the HST pedal, then something trips the stop solenoid and shuts the engine down.

    No such relationship is discussed in the manual, but it is exists.
    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

  7. #27
    Veteran Member kuboman's Avatar
    Join Date
    Dec 2009
    Posts
    2,066
    Location
    Canada
    Tractor
    B3200, L5740,

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    Quote Originally Posted by texasjohn View Post
    Am the OP, Have service manual and read it.
    That's how I found the tach sensor.
    I did one thing and one thing only, reseated the connection right at the sensor.
    Problem solved.
    Am convinced that some relationship exists between sensing RPM's and the stop solenoid such that at extremely slow HST speeds the solenoid is allowed to be open, but when more speed is requested at the HST pedal, then something trips the stop solenoid and shuts the engine down.

    No such relationship is discussed in the manual, but it is exists.
    Well just for fun you should unhook the tack sensor completely and see what happens.
    L5740 LA854 loader
    L3130 LA723 loader sold
    B3200 LA504 loader
    B1550 sold
    B2620 sold
    B4200 sold
    F2680E
    GF1800
    Kubota RTV900
    JD 850D Gator sold
    JD F935 x 2 sold
    Case 590SM-2
    JD 310D TLB
    Ford 555D sold
    Gehl 602 excavator

  8. #28

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    Quote Originally Posted by kuboman View Post
    Well just for fun you should unhook the tack sensor completely and see what happens.
    Nope, Nope, Nope, and Nope!

    First rule of repair work, If it ain't broke, don't fix it!



    Don

  9. #29
    Veteran Member kuboman's Avatar
    Join Date
    Dec 2009
    Posts
    2,066
    Location
    Canada
    Tractor
    B3200, L5740,

    Default Re: Grand L5030 starts/idles perfectly but chokes when loaded.

    Quote Originally Posted by dnels0n View Post
    Nope, Nope, Nope, and Nope!

    First rule of repair work, If it ain't broke, don't fix it!



    Don
    Chicken
    L5740 LA854 loader
    L3130 LA723 loader sold
    B3200 LA504 loader
    B1550 sold
    B2620 sold
    B4200 sold
    F2680E
    GF1800
    Kubota RTV900
    JD 850D Gator sold
    JD F935 x 2 sold
    Case 590SM-2
    JD 310D TLB
    Ford 555D sold
    Gehl 602 excavator

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