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  1. #1
    New Member
    Join Date
    Sep 2002
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    10
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    New England
    Tractor
    Kubota B2150HST

    Default Help Kubota Diesel Losing Power Under Load

    Help,

    I have a B2150 with low hours that has always run faithfully. I performed a full service on it about a year ago including all new oils and filters.

    I have not run it in about 6 weeks, I started it and let it idle for about 90 minutes while I was prepping the outside of my house for clearing the first snow of the winter. I went to start working and revved it up to about 2000 RPM and it would not go higher but I dismissed that as the throttle lever being too stiff to push farther (that is common on this machine). So I started to work and after about 1 minute it started to lose RPM under any load. Then after fiddling with the throttle lever I observed that it really would not go above 2000RPM whereas normally it will go to maybe 2900RPM. As I write this post I can hear it outside hunting around between 1000 and 1500 RPM. The only thing I can think of is that I did add some fuel oil that had been sitting for maybe 6 months. I was hunting around for some anti-gel/water absorbing additive but I seem to be out. I am headed out right now to buy some more fuel additive and see if that helps. But I would appreciate any advice I could get. I am pretty handy, but I am no diesel mechanic.

    Thanks,

    Jeff Booth

  2. #2
    Veteran Member
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    Feb 2002
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    1,055
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    WVa
    Tractor
    Kubota L3710, Ford 5600, Case MB4/94, Kubota B6200

    Default Re: Help Kubota Diesel Losing Power Under Load

    My guess is some water has partially blocked the filter. I'd pull the fuel filter and drain some of the fuel into a glass jar to check for water. If you've got water, continue to drain the tank until all the water is out, wash the filter with fresh diesel and reinstall. or use a new one

  3. #3
    Super Member RickB's Avatar
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    Eastern NY
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    Case 885, JD 730D, Ford 4000

    Default Re: Help Kubota Diesel Losing Power Under Load

    Don't waste your time trying to flush or clean a throw-away fuel filter element. Put a new one in. Tip; Change the fuel filter(s) between Halloween and Thanksgiving in any diesel application that has to run in cold weather. Saves a lot of headaches.

  4. #4
    New Member
    Join Date
    Sep 2002
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    10
    Location
    New England
    Tractor
    Kubota B2150HST

    Default Re: Help Kubota Diesel Losing Power Under Load

    Yes, It was the filter, clogged with gunk and some wax. First I tried pouring Diesel 911 into the tank and that helped a lot. But nonetheless it was not perfect, I pulled the element and tossed it and now it runs 100%. Thanks for the tips Rick & Darren [img]/forums/images/graemlins/smile.gif[/img]

    Jeff

  5. #5
    Veteran Member
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    Sep 2001
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    1,771
    Location
    Kansas
    Tractor
    Kubota L3000DT

    Default Re: Help Kubota Diesel Losing Power Under Load

    </font><font color="blue" class="small">( Don't waste your time trying to flush or clean a throw-away fuel filter element. Put a new one in. Tip; Change the fuel filter(s) between Halloween and Thanksgiving in any diesel application that has to run in cold weather. Saves a lot of headaches. )</font>

    That is really good advice.

    I would guess the problem is either water freezing in the fuel filter or gelling fuel, if it is summer fuel. No mention was made of temperature that the problem occurred in, but New England, this time of year, can't be too warm.

  6. #6
    Silver Member
    Join Date
    Apr 2005
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    128
    Location
    New Hampshire, USA
    Tractor
    JD 4500

    Default Re: Help Kubota Diesel Losing Power Under Load

    One of the simplest maintenance procedures is to change the fuel filter every fall. I have been doing this since I purchased my JD4500 nearly 6 years ago and never have experienced any problems with it. It's easy and cheap maintenance.

  7. #7
    Epic Contributor Soundguy's Avatar
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Help Kubota Diesel Losing Power Under Load

    No max rpm, hunting, loss of power?

    It's starving four fuel. Either got water .. or bad filter.. or both.. or a blocked prefilter in the tank.. or crud blocking the fuel valve..

    Soundguy

  8. #8
    Super Member ronjhall's Avatar
    Join Date
    Apr 2000
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    7,254
    Location
    SE Michigan, TX when its cold in MI.
    Tractor
    Kubota 2910 HST

    Default Re: Help Kubota Diesel Losing Power Under Load

    <font color="blue"> I pulled the element and tossed it and now it runs 100%. </font>
    I hope you put a new filter back in its place. [img]/forums/images/graemlins/tongue.gif[/img]

  9. #9
    Veteran Member
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    Feb 2002
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    WVa
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    Kubota L3710, Ford 5600, Case MB4/94, Kubota B6200

    Default Re: Help Kubota Diesel Losing Power Under Load

    You can always change a filter to be safe but you can add instrumentation to help determine if the filter is the cause of the problem and possibly save some time and money. If the filter is good, don't change it.

    Shortened Long Link

    Lots of boat owners have expensive diesel engines that have more instrumentation than temp and pressure, etc. to make life simpler. The same gage would work on a tractor.

    MikePA: Please review your message before posting it. It's simple not to create a long link that widens the entire thread. Just insert a descriptive word or two between the {url=http://whatever}<font color="red">Enter words here</font>{/url} instead of the entire URL. Replace parentheses {} with square brackets in previous example. Alternatively, if you use the Instant Markup language URL link, the first prompt is for the URL. The second prompt is for a description. Do not simply paste in the URL again. Type a short description of the link.

  10. #10
    Super Member RickB's Avatar
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    Eastern NY
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    Case 885, JD 730D, Ford 4000

    Default Re: Help Kubota Diesel Losing Power Under Load

    Conceptually not a bad idea. There are several assumptions in the auction text that probably don't apply to compact tractors. The most glaring is the recommendation to change the filter at 10"hg reading on the gauge. As most compacts have a gravity system with no transfer pump, they probably quit altogether well before that vacuum level is ever reached. Some diesel fuel filter elements are quite expensive. Compact tractor fuel filters generally are not. This gauge installation would cost several times what one fual filter costs, and only tell the operator what he probably already knows; the filter is plugged and my tractor is in a snowbank. I will continue to preform preventative maintainence where fuel filters are concerned.

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