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  1. #1
    Bronze Member
    Join Date
    Mar 2004
    Posts
    95
    Location
    Underwood, WA
    Tractor
    Kubota B7800

    Default B7800 Losing Power

    I have a B7800 that I bought new about six years ago. Moderate home use over the years and though I have pushed it at times, I have generally kept up on maintenance. Last year I noticed when I used the mower deck it will struggle and bog down when going even slightly uphill or cutting longer length grass. It generally happened only until the tractor warmed up and then it seemed to run fine.

    Today I was using my landscape rake to grade our gravel drive. I had the same thing happen where the power just seemed to fade. If I took my foot off the throttle a bit the power would run back up. Basically, it just seemed like I was working the engine too hard, but I have used the tractor for this before and it handled it just fine. In other words, my tractor just doesn't seem to be able to handle the load that it used to. The engine temp reading never got above the "C" on the gauge, but the tractor did seem to get a bit warm under the seat area and I think I was able to make out a slight smell of burning rubber. The tractor also seemed to not want to roll very easily unless I was pressing the throttle with my foot. I am wondering if the brakes are stuck or something causing the engine to work overtime. I have in the past accidently driven the tractor a bit with the brake locked.

    I am hoping someone can point me in the right direction, whether this relates to the brakes or something else. It is likely I will have to bring it into the shop, but I would at least like to get an idea of what I am looking at before bringing it in. And it is always possible I could fix it myself. Any idea?

    Thanks,

    Matt

  2. #2
    Veteran Member kuboman's Avatar
    Join Date
    Dec 2009
    Posts
    2,127
    Location
    Canada
    Tractor
    B3200, L5740,

    Default Re: B7800 Losing Power

    Quote Originally Posted by snmhanson View Post
    I have a B7800 that I bought new about six years ago. Moderate home use over the years and though I have pushed it at times, I have generally kept up on maintenance. Last year I noticed when I used the mower deck it will struggle and bog down when going even slightly uphill or cutting longer length grass. It generally happened only until the tractor warmed up and then it seemed to run fine.

    Today I was using my landscape rake to grade our gravel drive. I had the same thing happen where the power just seemed to fade. If I took my foot off the throttle a bit the power would run back up. Basically, it just seemed like I was working the engine too hard, but I have used the tractor for this before and it handled it just fine. In other words, my tractor just doesn't seem to be able to handle the load that it used to. The engine temp reading never got above the "C" on the gauge, but the tractor did seem to get a bit warm under the seat area and I think I was able to make out a slight smell of burning rubber. The tractor also seemed to not want to roll very easily unless I was pressing the throttle with my foot. I am wondering if the brakes are stuck or something causing the engine to work overtime. I have in the past accidently driven the tractor a bit with the brake locked.

    I am hoping someone can point me in the right direction, whether this relates to the brakes or something else. It is likely I will have to bring it into the shop, but I would at least like to get an idea of what I am looking at before bringing it in. And it is always possible I could fix it myself. Any idea?

    Thanks,

    Matt
    Are the brakes off

    Change the fuel filter. Sounds like a plugged filter.
    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 sold
    Ford 555D sold
    Gehl 602 excavator sol

  3. #3
    Bronze Member
    Join Date
    Mar 2004
    Posts
    95
    Location
    Underwood, WA
    Tractor
    Kubota B7800

    Default Re: B7800 Losing Power

    The brake lock lever is up so the brakes should be off. I'll start with the fuel filter.

    Thanks!

    Matt

  4. #4
    Super Member JerryG's Avatar
    Join Date
    Apr 2000
    Posts
    7,211
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: B7800 Losing Power

    How long has it been since the hydraulic fluid and filter been changed? Was there any fiber in the fluid, filter or screen?

  5. #5
    Elite Member whistlepig's Avatar
    Join Date
    Jan 2009
    Posts
    4,267
    Location
    Preble County, Ohio
    Tractor
    Kubota B7800 with FEL

    Default Re: B7800 Losing Power

    Lose of power means lose of fuel or air on a diesel. If you suspect the brakes put it in neutral and see if the tractor rolls easily when pushed on level ground. Check the fuel cap to see if it is venting. Replace the fuel filter if needed. Check the air filter. Check the fuel system for air leaks. If it is bleeding air it will be leaking fuel from the same place when the motor is not running. Give the motor a good washing and drying and then check for fuel leaks. It may not be one big leak but several small leaks of air that causes it to lose power.
    I used to do the Hokey Pokey but I turned myself around.

  6. #6
    Veteran Member
    Join Date
    Dec 2009
    Posts
    1,902
    Location
    S. W. Virginia
    Tractor
    Kubota B3200, Ford NAA, IH 454D, Case 1845C

    Default Re: B7800 Losing Power

    My first guess would be air filter, second would be fuel filter. The air filters on these tractors are pretty small and it doesn't take them long to get plugged in dusty loader or mower work. If that is good check the fuel filter.
    Kubota B3200
    Ford NAA Jubilee
    International 454D
    Case 1845C skid steer
    JD 265

  7. #7
    Veteran Member easygo's Avatar
    Join Date
    Mar 2007
    Posts
    1,402
    Location
    Eddington, Maine
    Tractor
    Kubota B7800

    Default Re: B7800 Losing Power

    Quote Originally Posted by snmhanson View Post
    Last year I noticed when I used the mower deck it will struggle and bog down when going even slightly uphill or cutting longer length grass. It generally happened only until the tractor warmed up and then it seemed to run fine.

    Basically, it just seemed like I was working the engine too hard, but I have used the tractor for this before and it handled it just fine. In other words, my tractor just doesn't seem to be able to handle the load that it used to.

    Matt
    I'm glad you posted this as I noticed something similar with my B7800 too a few days ago. I only use it in Hi gear two or three times a year and it just would not have the power it had when I used it in Hi last time. If the above posts are correct it will have to be the fuel filter. I put a fresh air filter in my tractor last fall and it has not seen any dust during the winter for sure. So. I will start with the fuel filter and see what happens. Please post something about it in case you are able to change the filter before I do. I will do the same but it will be a few days to a week before I get to it.

    here is a thread about purging the air from the fuel line
    http://www.tractorbynet.com/forums/k...ne-3030-a.html
    It's the going that counts not the distance!

  8. #8
    New Member
    Join Date
    Dec 2006
    Posts
    21
    Location
    Stroudsburg, PA (the Poconos)

    Default

    I had the same problem this winter. Turns out a mouse built a nest near my air filter. Threw him and his nest out then power was restored.

  9. #9
    Bronze Member
    Join Date
    Mar 2004
    Posts
    95
    Location
    Underwood, WA
    Tractor
    Kubota B7800

    Default Re: B7800 Losing Power

    I ran to the shop and bought a new air and fuel filter. Replaced my air filter and the old was was pretty dirty. Couldn't see light when looking inside it on a sunny day. Haven't gotten around to the fuel filter and I haven't put any load on the tractor to determine if it was a dirty air filter.

    However, I pulled the tractor into the garage where the ground is flat and smooth. I tried to push it while it was in neutral as whistlepig suggested and it wouldn't move. It rocked back and forth like a car that is stuck in gear but the wheels wouldn't turn. I am still wondering if the brakes aren't stuck somehow. Are the brakes something I could check out and possibly work on myself or should I haul it to the shop? Like I said, I did drive it a few times in the past with the brake lever engaged so I wouldn't doubt that there is an issue with the brakes. Or could this be something as simple as time to change the HST fluid?

    Thanks,

    Matt

  10. #10
    Veteran Member kuboman's Avatar
    Join Date
    Dec 2009
    Posts
    2,127
    Location
    Canada
    Tractor
    B3200, L5740,

    Default Re: B7800 Losing Power

    Quote Originally Posted by snmhanson View Post
    I ran to the shop and bought a new air and fuel filter. Replaced my air filter and the old was was pretty dirty. Couldn't see light when looking inside it on a sunny day. Haven't gotten around to the fuel filter and I haven't put any load on the tractor to determine if it was a dirty air filter.

    However, I pulled the tractor into the garage where the ground is flat and smooth. I tried to push it while it was in neutral as whistlepig suggested and it wouldn't move. It rocked back and forth like a car that is stuck in gear but the wheels wouldn't turn. I am still wondering if the brakes aren't stuck somehow. Are the brakes something I could check out and possibly work on myself or should I haul it to the shop? Like I said, I did drive it a few times in the past with the brake lever engaged so I wouldn't doubt that there is an issue with the brakes. Or could this be something as simple as time to change the HST fluid?

    Thanks,

    Matt
    Was your range lever in neutral? It will act like it is stuck in gear when you try and move it if the range lever is still in high or low. It is trying to pump oil backwards so there is quite a bit of resistance. If everything is in neutral and you cannot move it then you may have a brake problem.
    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 sold
    Ford 555D sold
    Gehl 602 excavator sol

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