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  1. #1
    Bronze Member Rice Rider's Avatar
    Join Date
    Apr 2009
    Posts
    69
    Location
    Virginia Beach and Lexington Virginia
    Tractor
    Kubota L3400 HST 4WD

    Default L3400 HST Hydraulic View Window Must Read


    After spending several days last week-end digging and hauling the tailings to another part of the property, I noticed some dark spots on the gravel leading up the drive. At first light I was up and looking over the tractor along the bottom side for possible leaks with none found. I looked at the sight glass for the hydraulic fluid and it had moist dust on it. Hmmmm, I took off the cover that protects the view glass and found it loose. I could move it either way and it did not get any tighter. I did notice if I pulled with even the slightest pressure on it, I would see fluid seeping by. This is a very bad thing when synthetic fluid cost around $11.00 @ quart. Anyway, I tried to tighten it with my fingers again and it came off slick as a whistle with fluid pouring out of the hole, crap, I plugged it with my thumb while I looked at the cover and it had broken leaving the threaded part screwed into the tractor. I put it back on and wedged it in place with a shop towel and headed into town to order another sight glass and a spare. I don稚 have a clue as to how it would break as it is in an armored location. I would suggest keeping an eye on yours. If that came off without noticing it, I would think it could pose a serious problem to your bank account.

  2. #2
    Bronze Member JAE 3400's Avatar
    Join Date
    Jun 2009
    Posts
    67
    Location
    Ashtabula Ohio
    Tractor
    Kubota L 3400

    Default Re: L3400 HST Hydraulic View Window Must Read

    R.R. Thanks for the heads up. I will keep an eye on mine. Good luck removing the threaded piece from your machine.
    L-3400 HST- LA 463 FEL-Forks- Goosen C/S- Bush Hog Tiller RTS 62- Landpride 6ft.RMM- Lienbach Aerator- PHD- 5ft. Box Scraper 2000 GMC 3500 HD Dump Truck

  3. #3
    Bronze Member Rice Rider's Avatar
    Join Date
    Apr 2009
    Posts
    69
    Location
    Virginia Beach and Lexington Virginia
    Tractor
    Kubota L3400 HST 4WD

    Default Re: L3400 HST Hydraulic View Window Must Read

    Thanks, I've been thinking the same thing. Is there a saint for tractors? If so, I need to start lighting a candle or saying some kubota repair prayers. My tractor is out in the woods so I plan on driving it onto a log (on the left side) so all the fluid goes to the other side to work on it.

  4. #4
    Silver Member Rebel's Avatar
    Join Date
    Sep 2007
    Posts
    113
    Location
    Wyoming High Plains

    Default Re: L3400 HST Hydraulic View Window Must Read

    Umm where is this "sight glass" located. Does my L3240 have one? Feeling like a moron if it does cause I've never noticed it.
    2007 L3240HSTC Fully Loaded, Top-n-Tilt, LA724 FEL, Bobcat Style Quick Attach Bucket and Forks, LandPride 66" Box Scraper With Hydralic Rippers.

    Tow Vehicle; 1997 4X4 Dodge 12 Valve Cummins, 542 HP and 1200+ FT-Lbs.

    2006 KTM 525 EXC, Woods Single Track Attack Machine

  5. #5
    Bronze Member JAE 3400's Avatar
    Join Date
    Jun 2009
    Posts
    67
    Location
    Ashtabula Ohio
    Tractor
    Kubota L 3400

    Default Re: L3400 HST Hydraulic View Window Must Read

    R.R. I haven't had my 3400 that long but the few bolts and screws that I have removed have been super tight. I'm thinking that your sight glass may have been over tightened and broken on the instillation thats why it came off in your hand. If you could find a large enough easy-out that may work. Otherwise a chisel and hammer used gently to try to remove it could work. If there is any threads sticking out past the the housing you could try to break off a piece and the rest could be easy. Let us know how it goes.
    L-3400 HST- LA 463 FEL-Forks- Goosen C/S- Bush Hog Tiller RTS 62- Landpride 6ft.RMM- Lienbach Aerator- PHD- 5ft. Box Scraper 2000 GMC 3500 HD Dump Truck

  6. #6
    Silver Member emmy71's Avatar
    Join Date
    Nov 2005
    Posts
    222
    Location
    North Carolina Piedmont
    Tractor
    Kubota L3400 HST

    Default Re: L3400 HST Hydraulic View Window Must Read

    The sight glass breaking issue is a common one here. I am assuming you have the one made completely of clear plastic. I don't think it is a tightening issue but more of a material issue. The good news is there is an updated part for this which is made much better. Also the threads are 3/4 inch pipe thread is I remember correctly. I replaced mine with a pipe plug until I got the new sight glass. My 3400 was about two years old when I noticed the problem. I took the broken one to my dealer and asked if he would cover it under warranty and he gave me a new one no charge. I keep the plug in the tool box on the tractor just in case.

    Terry
    2006 Kubota L3400 HST, R4's, LA 463 loader.
    Landpride FDR1672 mower, Hawkline 5' rotary cutter, 5' United boxblade, 6' scrape blade, Woods 5000 chipper/shredder

  7. #7
    Bronze Member Rice Rider's Avatar
    Join Date
    Apr 2009
    Posts
    69
    Location
    Virginia Beach and Lexington Virginia
    Tractor
    Kubota L3400 HST 4WD

    Default Re: L3400 HST Hydraulic View Window Must Read

    I ordered two of the view windows from my local dealer (not having read about your three quarter inch pipe plug). I suppose the pipe plug would be cheaper but I was wandering if the sealing washer will fit on the plug. Also, I was wandering if there is any way to tell if the new improved part from the old style that broke. One thing is for sure, I will be keeping an eye to the floor board from now on while operating.

  8. #8
    Elite Member wushaw's Avatar
    Join Date
    Mar 2005
    Posts
    3,075
    Location
    Bristol Texas
    Tractor
    Kubota L2800, 15 hp 372 Mitsubishi

    Default Re: L3400 HST Hydraulic View Window Must Read

    Mine went @200 hrs, I also purchased a spare.
    Kubota L2800HST, Mitsubishi 372, bh75, 45" Agric tiller, 5' home made disk, 42" Bush hog, PHD, 66" Cammond BB.

  9. #9
    Silver Member emmy71's Avatar
    Join Date
    Nov 2005
    Posts
    222
    Location
    North Carolina Piedmont
    Tractor
    Kubota L3400 HST

    Default Re: L3400 HST Hydraulic View Window Must Read

    Quote Originally Posted by Rice Rider View Post
    I ordered two of the view windows from my local dealer (not having read about your three quarter inch pipe plug). I suppose the pipe plug would be cheaper but I was wandering if the sealing washer will fit on the plug. Also, I was wandering if there is any way to tell if the new improved part from the old style that broke. One thing is for sure, I will be keeping an eye to the floor board from now on while operating.
    The old one was made of clear plastic. The new one is a green or gray (don't remember off hand) plastic with a clear window. If I get a chance I will take a picture of it. I used a PVC plug as a temporary fix and did not even need the washer. That is the plug I keep for a spare.

    Terry
    2006 Kubota L3400 HST, R4's, LA 463 loader.
    Landpride FDR1672 mower, Hawkline 5' rotary cutter, 5' United boxblade, 6' scrape blade, Woods 5000 chipper/shredder

  10. #10
    Gold Member
    Join Date
    Jun 2006
    Posts
    325
    Location
    Oklahoma
    Tractor
    2006 Kubota L2800 HST

    Default Re: L3400 HST Hydraulic View Window Must Read

    Mine has been replaced twice first time by the dealer second time by me. The second one was a different design. I would say it broke because it was over torqued or bad design/material. Althought the dealer told me something probably hit it causing it to break I don't believe that is what happened. Replacing the lost fluid cost more than the plug. I put the new one in very carefully/low torque with silicone RTV on the gasget.
    Marcussen
    Kubota L2800 HST
    Kubota LA463 FEL
    Woods GB60 Box blade
    Woods Brushbull BB60 (Rotary mower)
    535 hours

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