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  1. #1
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    Default TURBO L series vs NON TURBO

    I was looking at buying a L4750HST, but a L5240HST is less than 2G's more. How good are the turbos on the L series tractors? I know from operating heavy equipment that most turbo failures are caused by lack of proper cool down or lube problems.

  2. #2
    Veteran Member
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    Jul 2002
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    North of the Fingerlakes - NY
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    Ford 4000; Ford 2000(both 3cyl.);JD40; 2004 Kubota L4300; 2006 Kubota B7610; new 2007 Kubota MX5000

    Default Re: TURBO L series vs NON TURBO

    Yeah, cool down's important...and it's one more thing to forget in the 'heat' of the moment. Whack something hard or get something plugged up or someone unexpectedly comes up to the machine, my tendency is to shut right down before going further. Not a good habit if a turbo is spinning.

    As for turbos themselves, they're one more thing to go wrong so, my attitude toward them is that they're great if they're really needed; otherwise, Keep-It-Simple and try to avoid. For operation at high elevations (say 3500'MSL and above), they're needed.

    I expect that, as they become more common, the problems with heat and lubrication will be solved. 5 or 10 years down the road they may not require any special handling and will probably last as long as the engine.

    Welcome to TBN.
    Bob
    New Kidz: '04 L4300 w/BH-90X, '06 B7610, '07 MX5000 Old Pros: '75 Ford 4000, '54 JD40

    Romans 8:28

  3. #3
    Platinum Member Double Orange's Avatar
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    Aug 2007
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    638
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    Boonies

    Default Re: TURBO L series vs NON TURBO

    Turbo cool down?
    I was told to let engine idle for 3 min/ no load.
    Is this correct?

  4. #4
    Veteran Member
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    Ford 4000; Ford 2000(both 3cyl.);JD40; 2004 Kubota L4300; 2006 Kubota B7610; new 2007 Kubota MX5000

    Default Re: TURBO L series vs NON TURBO

    Quote Originally Posted by Double Orange View Post
    Turbo cool down?
    I was told to let engine idle for 3 min/ no load.
    Is this correct?
    That would normally be enough.
    New Kidz: '04 L4300 w/BH-90X, '06 B7610, '07 MX5000 Old Pros: '75 Ford 4000, '54 JD40

    Romans 8:28

  5. #5
    Silver Member
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    Jul 2003
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    120
    Location
    Louisiana
    Tractor
    Kubota L3130 HST

    Default Re: TURBO L series vs NON TURBO

    It was my experience as well that it ws only a few dollars more to go from the 4740 to the 5240. It's also only a few more dollars between the 5240 and the 5740. On a dollar per horsepower basis, the 5740 was the best deal so that's why I went with it.

    I've talked to several kubota mechanics at different dealerhips and none of them had any concerns about the turbo.

  6. #6
    New Member
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    Aug 2008
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    Default Re: TURBO L series vs NON TURBO

    Keeping it simple is good advice. My B20 (15 years old) is a simple and rugged tractor, but I want to go bigger L48, 4740, 5240, 5740 it's hard to decide. I know the L48 is no longer made.
    _________________
    1993 B20, Walco 60" rotary cutter, Farm King 60" RM snowblower.

  7. #7
    Super Member
    Join Date
    Feb 2006
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    8,605
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    VA
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    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: TURBO L series vs NON TURBO

    Quote Originally Posted by Double Orange View Post
    Turbo cool down?
    I was told to let engine idle for 3 min/ no load.
    Is this correct?
    Excessive time unless you have just come off extended use at full rated HP. If youve motored back to the barn after plowing the field, 20 or 30sec at idle is sufficient. Also syn oils are more resistant to heat and thus less likely to "coke" the bearings if stopped hot.
    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

  8. #8
    Silver Member
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    Oct 2006
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    225
    Location
    eastern Australia, God's own country
    Tractor
    kubota m125x

    Default Re: TURBO L series vs NON TURBO

    i have never ever seen a kubota turbo let go with out being caused by something, usually engine parts going through them.
    usually with a turbo it will add a lot of torque to a motor. say a turbo 50hp motor has more lugging power than a non turbo 50 hp engine because turbo's increase efficiency which shows up as more torque. this is not always true, but usually.
    as for cooling them down if your only playing around and have not had it under a big load for the last 5 minutes just turn the thing off, its cooled already. the real danger time is when you stall a machine while at full throttle and going hard. then restart as soon as possible cause that puppy's doing about 100,000RPM
    my opinion, buy the big sucker L57. you cant have to many ponies

  9. #9
    Veteran Member
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    Jun 2003
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    1,649
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    Northern, New York
    Tractor
    Kubota L3830 03: RTV 900

    Default Re: TURBO L series vs NON TURBO

    Keep in mind that the 4740,5040,5240,5740 use the same liter engine.
    M-5040 w/cab, 05 RTV 900, Where the maple sap flows

  10. #10
    Super Member
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    Apr 2000
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    6,225
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    central New York
    Tractor
    all makes and models

    Default Re: TURBO L series vs NON TURBO

    Good oil is critical to turbo life! I find that some have trouble for one reason or another realizing that a tractor for many mean that it is at or near full throttle for extended periods of time while mowing and blowing snow. This is far different then the oil designed for an over the road truck or diesel car.

    Someone trying to save a dollar on the oil and filter life is the one that might have the most trouble with a turbo. The engine needs have strong enough of a lower end as well as be ready for more heat on the upper end. Most manufacturers build this into the engine if they are offering the turbo on the engine.

    Years ago there was plenty of add-on systems for ag tractors and they did cause engine failures sooner when sent out to the field under use. The tractors that were used for utility duties with little or no hard use often lasted as long as the untouched ones.

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