Page 1 of 2 12 LastLast
Results 1 to 10 of 18
  1. #1
    New Member
    Join Date
    May 2007
    Posts
    8
    Location
    Petaluma, CA
    Tractor
    Kubota B7800

    Default Losing power???

    Hey gang.. I have a kubota B7800 with 560 hours on it that has recently been losing power... It barely makes it up a maybe 20 percent grade that it used to zoom up.. The front loader seems weak too. I had lent it to a friend who said he put in more hydraulic fluid for me, then I found out it was the stuff he uses for his log splitter which is a lot lighter weight than the UD I normally put in it.. could that be part of the problem? Had it serviced about 80 hours ago so most filters should still be good... any other thoughts out there?

  2. #2
    Super Star Member
    Join Date
    Mar 2008
    Posts
    10,434
    Location
    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: Losing power???

    Does the engine bog down, or is the tractor just slow?
    If the engine bogs down, I would look at the fuel and air filters, otherwise, I would change the hydraulic fluid and the associated filter(s).

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  3. #3
    New Member
    Join Date
    May 2007
    Posts
    8
    Location
    Petaluma, CA
    Tractor
    Kubota B7800

    Default Re: Losing power???

    Thanks Aaron, it feels more like it's just slow all the way around... from the moment I step on the gas. I just browsed an earlier thread that mentioned the filters, but I really don't think that's the problem because they're pretty new... so that's why I was wondering about the potential hydraulic fluid problem.

  4. #4
    Super Star Member
    Join Date
    Mar 2008
    Posts
    10,434
    Location
    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: Losing power???

    How much fluid did he add? That takes 3.83 gallons (per Messicks), so a quart or so shouldn't have affected it much but a gallon would.

    Sounds like it could be a fluid issue (assuming that there isnt something that was overlooked, like the transmission being in low range)

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  5. #5
    New Member
    Join Date
    May 2007
    Posts
    8
    Location
    Petaluma, CA
    Tractor
    Kubota B7800

    Default Re: Losing power???

    Well... I've changed out the trans/hydraulic fluid and all filters including the fuel filter... don't really feel much of a change in it. It still really drags going up that little incline at anything under 2K rpm in mid gear and it used to roll right up it.... I've run out of daylight, but it seems it may be something that those simple procedures don't fix...

  6. #6
    Platinum Member Mark Page's Avatar
    Join Date
    Sep 2009
    Posts
    559
    Location
    Maryland
    Tractor
    Massey Ferguson 2615 48hp, 4wd, loader

    Default Re: Losing power???

    I had exactly the same problem with my 45hp Massey. It barely pulled a hill that was never a problem. The sight glass was clean, so a put in a new filter element anyway, same problem. Started pulling fuel lines from the injector pump to the gas tank and blowing them out with air, no blockages found until I got to the mechanical lift pump under the tank. There was a tiny pc of green material stuck in a screen type filter. Fired it up and it ran better than ever. I can't believe that little pc of debris could cause that much power loss.
    Gear Up and Throttle Down.

    2011 Massey 2615, 7ft Woods Rear Discharge Finish Mower, 6 ft Lucknow Snow Blower, Danuser post hole digger with 12" and 24" augers, 350 lb 3 pt broadcast spreader, 7ft scraper blade, 7 ft. drag harrow, JD GT 275 rider with 38" snow blower attachment.


  7. #7
    New Member
    Join Date
    May 2007
    Posts
    8
    Location
    Petaluma, CA
    Tractor
    Kubota B7800

    Default Re: Losing power???

    Replaced the fuel, blew out all the lines, changed other fluids and filters as listed above and still no luck... I think it's time for a visit to the dealer... crud...

  8. #8
    Gold Member
    Join Date
    Jun 2009
    Posts
    279
    Location
    Shenandoah County, VA
    Tractor
    Kubota B7300

    Default

    When my little kubota started feeling that way, it was a clog in the air intake. But I'm sure you checked that already. How are the RPMs?

  9. #9
    New Member
    Join Date
    May 2007
    Posts
    8
    Location
    Petaluma, CA
    Tractor
    Kubota B7800

    Default Re: Losing power???

    Thnx SJ...I did go through all the air intake possibilities, including new filter. Since rpm's are adjustable.. the engine, when I'm not moving or when there is no load, sounds fine... no brake binding.. it's rolls in neutral. I'm stumped unless it's something internal..

  10. #10
    Elite Member
    Join Date
    Mar 2009
    Posts
    3,229
    Location
    Lee, IL
    Tractor
    John Deere 1070

    Default Re: Losing power???

    If it is not bogging down (rpm's staying about the same) then I would say probably not engine related and more hydro- related, especially if you are noticing an issue with the loader. I recently bought a used loader for my tractor and when I put it on it would barely lift it's own weight. I already had the loader controls on my tractor, but after extensive investigating I found that there was an internal plug on my scv valve for an optional something or other. Long story short I either had the option or didn't but whatever the case was there was this plug that had backed out and was sitting loose inside the valve and allowing all of the fluid to bypass. Maybe there is something similar in your case? My tractor is geared so I did not notice a driving problem, also there was no affect on the 3 pt hitch.

Page 1 of 2 12 LastLast

Similar Threads

  1. Tc18 losing power
    By Mowedover in forum Parts/Repairs
    Replies: 7
    Last Post: 09-04-2012, 10:36 AM
  2. B7800 Losing Power
    By snmhanson in forum Kubota Owning/Operating
    Replies: 14
    Last Post: 05-11-2011, 12:57 PM
  3. BX2200 losing power
    By AaronS in forum Kubota Owning/Operating
    Replies: 5
    Last Post: 06-08-2009, 01:55 PM
  4. losing power
    By bob_wood in forum Parts/Repairs
    Replies: 3
    Last Post: 08-25-2008, 07:01 PM
  5. Losing Hyd Power?
    By GaryK in forum Parts/Repairs
    Replies: 8
    Last Post: 04-16-2002, 11:19 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.