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  1. #1
    Gold Member CanuckPT's Avatar
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    2011 Kubota B3300SU

    Default Kubota BH77 bucket won't stay extended

    I was about to attach my new Bro-Tek thumb when I realized my bucket was curling with just it's weight & gravity! I did have to replace a hose on it last fall just after I got it as it had a hole. I haven't really used it since replacing the hose. Could it just be air in the system? I don't see any leaks & my fluid levels seem fine. Or is this just normal? This is my first tractor so I'm a newbie!!
    Attached Thumbnails Attached Thumbnails -image-1335073658-jpg  
    Kubota BH77 Backhoe with Bro-Tek mechanical thumb & Bro-Tek Ripper Tooth; Loflin 48 inch forks; Bro-Tek 2" rear wheel spacers; StabilWorks custom stabilizers; EA 66" Box Blade; WoodMaxx WM-8H Chipper; NorTrac Quick Hitch

  2. #2
    Veteran Member Carl_NH's Avatar
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    Coastal NH
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    01 Kubota B21TLB, 2010 Ferris 52" ZTR, Cub Cadet 1811, Gravely Super8

    Default Re: Kubota BH77 bucket won't stay extended

    Probably just air in the cylinder - cycle it a few times all the way out and in should clear it up. WIth a new BH you shouldnt see leak down.

    Over time they will leak down - like 3-4 hours and thats normal. Looks like you got the brotek weld on? Did you get the 1" pins or 3/4"? I have the Brotek too, and with the Cat 1 pin 3/4" it was not strong enough for the clamping force of the bucket so Richard made up a 1" for a good price and swapped it out and now its much better.

    I use it for walls and rocks we have here in NH and also log lifting and cutting.

    Carl
    Kubota B21TLB, Ferris IS2000, Cub Cadet 1811

  3. #3
    Super Member Gary Fowler's Avatar
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    Bismarck Arkansas
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    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Kubota BH77 bucket won't stay extended

    My B26 leaks down at all point on the backhoe and FEL with varying degrees of rapidity. THe boom will leak down to the ground overnight or less time -haven't timed it to full ground contact but it will leak a few inches in 15 minutes or so if not pinned up. The bucket gradually falls down over about a week or so, even the stabilizers gradually leak outward a bit. The FEL also will leak down about 3 feet overnight. It seems kubota has about the most PP valve seats in the industry which is a darned shame considering the price they charge for these TLB's. I once left my LS P 7010 FEL up in the air for over a month and it only leaked down about 2 feet. The 3 PH doesn't leak at all and will stay up indefinitely.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  4. #4
    Veteran Member Carl_NH's Avatar
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    01 Kubota B21TLB, 2010 Ferris 52" ZTR, Cub Cadet 1811, Gravely Super8

    Default Re: Kubota BH77 bucket won't stay extended

    HI Gary,

    Same thing here with the B21 too. BTW, thought you would be in Africa now or very soon?

    Carl
    Kubota B21TLB, Ferris IS2000, Cub Cadet 1811

  5. #5
    Gold Member CanuckPT's Avatar
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    2011 Kubota B3300SU

    Default

    I got my thumb installed - its the bolt on Carl, not the weld on. I ran the BH a bit but not under any load & it was a bit improved. I think I'll get it out & try digging a stump or 2 tomorrow & see if that improves its attitude!!
    Kubota BH77 Backhoe with Bro-Tek mechanical thumb & Bro-Tek Ripper Tooth; Loflin 48 inch forks; Bro-Tek 2" rear wheel spacers; StabilWorks custom stabilizers; EA 66" Box Blade; WoodMaxx WM-8H Chipper; NorTrac Quick Hitch

  6. #6
    Gold Member CanuckPT's Avatar
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    2011 Kubota B3300SU
    Kubota BH77 Backhoe with Bro-Tek mechanical thumb & Bro-Tek Ripper Tooth; Loflin 48 inch forks; Bro-Tek 2" rear wheel spacers; StabilWorks custom stabilizers; EA 66" Box Blade; WoodMaxx WM-8H Chipper; NorTrac Quick Hitch

  7. #7
    Gold Member CanuckPT's Avatar
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    2011 Kubota B3300SU

    Default

    I worked the BH this am doing some stump digging & generally working the bucket & no real change. Here's a new video I did in case the audio helps.

    http://youtu.be/JdTJ1ZipaRE
    Kubota BH77 Backhoe with Bro-Tek mechanical thumb & Bro-Tek Ripper Tooth; Loflin 48 inch forks; Bro-Tek 2" rear wheel spacers; StabilWorks custom stabilizers; EA 66" Box Blade; WoodMaxx WM-8H Chipper; NorTrac Quick Hitch

  8. #8
    Gold Member
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    Prosper, TX
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    L3800 HST & ZD323-60

    Default Re: Kubota BH77 bucket won't stay extended

    Nice THUMB I do not think the bucket control has a cushion valve on it, if I referring to it correctly, but I had a problem a couple of times with my BH77. My problem was the boom would not hold a fairly light load up and would drift down like your bucket. I tried lifting the rear of the tractor off the ground with the boom and it would not. Called the dealer and they said they have seen this and recommended pulling the ends off the control valve. Pulled it apart and everything was clean. Sprayed some carb cleaner on the disassembled parts anyway and put it back together. Worked perfect after that. I later had a similar problem with one of the other circuits, can't remember which one, and the problem was the same thing. I am hoping when I get some more hours on it this problem will go away. It has been quite a few months since this has happened and all is still working perfectly. I posted a couple of pictures showing what I pulled apart. I think they provide the "cushion" or relief, but I do not know for sure. Hopefully someone can correct me. Without going out and looking, I do not think the bucket valve has one of these?? Good luck and I hope you get it straightened out. My guess is, it is something sticking inside the valve.

    -bh-valve1-jpg-bh-valve2-jpg

    Russ

  9. #9
    Gold Member
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    Prosper, TX
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    L3800 HST & ZD323-60

    Default Re: Kubota BH77 bucket won't stay extended

    Forgot to mention you should post this question or a link to this thread, in the kubota owning and operating section, as you will probably get more views and feedback.

  10. #10
    Gold Member CanuckPT's Avatar
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    2011 Kubota B3300SU

    Default

    Quote Originally Posted by 1savoy View Post
    Nice THUMB I do not think the bucket control has a cushion valve on it, if I referring to it correctly, but I had a problem a couple of times with my BH77. My problem was the boom would not hold a fairly light load up and would drift down like your bucket. I tried lifting the rear of the tractor off the ground with the boom and it would not. Called the dealer and they said they have seen this and recommended pulling the ends off the control valve. Pulled it apart and everything was clean. Sprayed some carb cleaner on the disassembled parts anyway and put it back together. Worked perfect after that. I later had a similar problem with one of the other circuits, can't remember which one, and the problem was the same thing. I am hoping when I get some more hours on it this problem will go away. It has been quite a few months since this has happened and all is still working perfectly. I posted a couple of pictures showing what I pulled apart. I think they provide the "cushion" or relief, but I do not know for sure. Hopefully someone can correct me. Without going out and looking, I do not think the bucket valve has one of these?? Good luck and I hope you get it straightened out. My guess is, it is something sticking inside the valve.

    <img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=313100"/><img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=313101"/>

    Russ
    Thanks for your input Russ. Did you take apart the threaded piece on top of the control valve?
    Kubota BH77 Backhoe with Bro-Tek mechanical thumb & Bro-Tek Ripper Tooth; Loflin 48 inch forks; Bro-Tek 2" rear wheel spacers; StabilWorks custom stabilizers; EA 66" Box Blade; WoodMaxx WM-8H Chipper; NorTrac Quick Hitch

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