Page 1 of 5 1234 ... LastLast
Results 1 to 10 of 43
  1. #1
    Member
    Join Date
    May 2009
    Posts
    31
    Location
    Mt Airy MD
    Tractor
    Gravely

    Default Hydraulics won't hold

    I just picked up a Terramite Model 1 backhoe. The out riggers will not stay up or hold the tractor when lowered. There are no external leaks, so I'm assuming everthing is internal. Where should I start looking? Would it be the pistons in the cylinders or the spoolers?

    Thanks, Ron C

  2. #2
    Elite Member wdchyd's Avatar
    Join Date
    Apr 2010
    Posts
    2,736
    Location
    Hooksett, NH
    Tractor
    Kubota B2320

    Default Re: Hydraulics won't hold

    Troubleshoot with a pressure guage or start with the pistons.......the piston seal inside is probably worn and bypassing.....you won't see any oil leaking if it's the internal piston seal......
    2010 Kubota B2320 FEL & BH65
    If it ain't fixed don't broke it!

    http://www.tractorbynet.com/content/...-month-wdchyd/

  3. #3
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    18,570
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Hydraulics won't hold

    If the relief for the BH does not activate with the cyl are fully extended or retracted, then you have a leak in the cyl as wdchyd mentioned. Remote possibility could be a worn outrigger spool, but unlikely. Are both outrigger cyl doing the same thing?
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  4. #4
    Member
    Join Date
    May 2009
    Posts
    31
    Location
    Mt Airy MD
    Tractor
    Gravely

    Default Re: Hydraulics won't hold

    Yes, it's both cylinders are doing the same thing. I suspect some of the others are as well, I just got it running yesterday. The machine was setting for quite a while.

  5. #5
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    18,570
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Hydraulics won't hold

    How many times have you cycled the outrigger cyl. Do they totally collapse or feel spongy?

    Cycle them about ten times and see if there is any difference.

    I would suggest a hyd gage and test all the cyl.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  6. #6
    Member
    Join Date
    May 2009
    Posts
    31
    Location
    Mt Airy MD
    Tractor
    Gravely

    Default Re: Hydraulics won't hold

    They have been moved up and down atleast that much, but I will run them through 10 full cycles to make sure. They will lift the tractor, but they bleed down in less than a minute.

  7. #7
    Platinum Member
    Join Date
    Oct 2010
    Posts
    687
    Location
    Near Peace river -Alberta
    Tractor
    ASV 4810

    Default Re: Hydraulics won't hold

    I would look in the valve block for a broke load valve spring or something.
    Even if the cyl piston seals leak,the legs should hold in the push downstroke.And slip back just a little till the pressure is equal on both sides of the piston when you let go of the lever,they'll just extend slower due to bypass to the return side.
    3 cockshutt 1855,1 cockshutt 1800.
    Belarus 800 and 925 .AC 940 whl ldr.Waldon 500 whl ldr.
    ASV 4810 tracksteer.
    4 GMC 2500 6.5/6.2 diesel trucks

  8. #8
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    18,570
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Hydraulics won't hold

    You never did say if the relief valve activated at full extend or retract. Any idea what the BH relief valve setting is?

    You could add a needle valve to the extend cyl hose. and raise the outriggers, then tighten the needle closed, and see what happens.

    That should lock the fluid in the base end. If the cyl leaks sown, it is for sure, bypassing.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  9. #9
    Member
    Join Date
    May 2009
    Posts
    31
    Location
    Mt Airy MD
    Tractor
    Gravely

    Default Re: Hydraulics won't hold

    I'm guessing it does. I'm basing that on the engine not dead heading when the piston reaches the end of the stroke. No idea what the settings are.

    They will hold position as long as I have the lever pushed, but as soon as I release it, they start to bleed off. Both side act the same and bleed down a pretty much the same rate.

  10. #10
    Veteran Member
    Join Date
    Apr 2009
    Posts
    1,023
    Location
    Port Angeles WA

    Default Re: Hydraulics won't hold

    This Model 1 Terramite is from between 1965 to 1972....cant find a good picture of it online....

    Main relief is not in the picture when outrigger cylinder is bleeding down. Control valve in neutral makes work ports closed.

    If piston seal is leaking and capped side holds the load, cylinder rod is retracting and that rod volume of oil must be displaced through the control valve, if there is no external rod seal leakage. Only an eventual work port relief, or spool could leak. If piston seal is leaking, pressure will equalize on both sides of piston.

    Bleed down in one minute do not tell the entire story...diameter size of rod and how long retract will determine leakage volume....

    OP should also make sure this old control valve really sets in the real neutral position, maybe it is sticking a bit and not closing the work port properly...spool stiction from rust etc could cause bleed down too....if spool is 1/32-2/32" off from neutral could be enough....

Page 1 of 5 1234 ... LastLast

Similar Threads

  1. Kubota Rear Hydraulics Cost?
    By JohnJohn in forum Kubota Owning/Operating
    Replies: 15
    Last Post: 12-12-2011, 07:26 PM
  2. Mahindra 4110: bucket dragging doesn't hold
    By beppington in forum Hydraulics
    Replies: 1
    Last Post: 01-17-2011, 07:09 PM
  3. Hydraulics won't hold Ford 3000 Tractor
    By vettegc in forum New Holland Owning/Operating
    Replies: 2
    Last Post: 06-20-2009, 01:00 AM
  4. 1965 JD 1020 Hydraulics disappeared. Need advice.
    By ME Gentleman Farmer in forum Hydraulics
    Replies: 3
    Last Post: 02-08-2009, 11:03 AM
  5. Question on remote hydraulics
    By jackson1 in forum Attachments
    Replies: 0
    Last Post: 02-12-2005, 06:18 AM

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.