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  1. #1
    New Member
    Join Date
    Jul 2007
    Posts
    10
    Location
    CT
    Tractor
    Kubota L35

    Default L35 GST / power steering

    My L35 is slow to engage when I put it in gear and I loose my power steering. When I take it out of gear my power steering comes back. I have checked hydraulic fluid level and it is fine. All other hydraulic systems seem to work fine. Any suggestions on what could be causing this?

  2. #2
    Silver Member
    Join Date
    Jan 2009
    Posts
    121
    Location
    AL

    Default Re: L35 GST / power steering

    Have you tried changing the filter? That could be the problem...
    ****Nothing operates or looks like a kubota!****

    2007 Kubota L39TLB
    2008 Kubota RTV900

  3. #3
    Gold Member
    Join Date
    Sep 2007
    Posts
    280
    Location
    Western US

    Default Re: L35 GST / power steering

    TG,

    Did it start this on it's own or was something done to the machine? The steering pump feeds the GST valve and there is a check valve poppet in the valve inlet that if missing could give this kind of a symptom.

    Of course I would check the fluid as well like FTC suggests but if it is only in this one circuit and no one has worked on the GST valve, I think you should have a look at the check valve.

  4. #4
    New Member
    Join Date
    Jul 2007
    Posts
    10
    Location
    CT
    Tractor
    Kubota L35

    Default Re: L35 GST / power steering

    I have checked the hydraulic fluid level and it is fine. I have less than 200 hours on the fluid and filter. This just started happening on its own, I was driving down the road and when I went to shift into a higher gear it started. If I push in the clutch or take it out of gear I get my power steering back. I will check the check valve once I get out of the snow.

  5. #5
    Gold Member
    Join Date
    Sep 2007
    Posts
    280
    Location
    Western US

    Default Re: L35 GST / power steering

    TG,

    The check valve is a poppet (like a bullet shape) where the steel pipe goes into the GST valve on the LH side of the transmission - about under the LH footrest.

    The fitting is a banjo type as I remember.

    I had one other thought as I was writing this - the steering pump has a priority flow divider on the top of it - short pipes connect it to the priority flow divider - that spool will have an orifice in it that has to be open or the spool will be moved open and send flow to the GST and PTO valves downstream.

    If the poppet on the valve inlet does not prove out, look at the priority flow divider on top the steering pump.

    Good luck - let us know if either / neither is right.

  6. #6
    Bronze Member
    Join Date
    Jul 2008
    Posts
    74

    Default Re: L35 GST / power steering

    Just a thought but could the position of the directional valve lever for the pto and backhoe cause the problem? If the backhoe is mounted and the valve lever was bumped so it's halfway between backhoe and pto setting, could the flow be split and trying to feed steering, glide shift, pto and backhoe all at the same time?

  7. #7
    Gold Member
    Join Date
    Sep 2007
    Posts
    280
    Location
    Western US

    Default Re: L35 GST / power steering

    TG,

    I looked at a schematic finally and I would bet you the check valve is sticking open.

    Good luck!

  8. #8
    New Member
    Join Date
    Jul 2007
    Posts
    10
    Location
    CT
    Tractor
    Kubota L35

    Default Re: L35 GST / power steering

    Fixed the problem, unfortunately it cost me $3150 for the repair. Turned out the clutch pack went and needed to be repaired. 2nd large repair job on this tractor.

  9. #9
    Veteran Member irwin's Avatar
    Join Date
    Feb 2007
    Posts
    1,280
    Location
    SE Conn
    Tractor
    2004 Kubota L35TLB, '89' Cub Cadet 1541

    Default Re: L35 GST / power steering

    Quote Originally Posted by tgoodart View Post
    Fixed the problem, unfortunately it cost me $3150 for the repair. Turned out the clutch pack went and needed to be repaired. 2nd large repair job on this tractor.
    That's an expensive clutch job. I hope there isn't any more issues for many years...
    Did it wear out or did something break/fail prematurely? What was the other large repair you had to do? (how many hours on the meter?)

    Best of luck Tim
    .....Tim

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