Page 3 of 12 FirstFirst 123456 ... LastLast
Results 21 to 30 of 115
  1. #21
    Silver Member
    Join Date
    Dec 2003
    Posts
    120
    Location
    UP of michigan
    Tractor
    L48 Kubota

    Default Re: Jerky project cylinder action

    The force is ample to lift the mast and then some.
    At this time, I am going to check if I have the load check valve in my contol valve.
    I am going to purge air from the ram.
    I am going to see if I can get the lower pressure relief cart rage so I do not stall my engine with the high back pressures when not at full throttle.
    A restrictor on the outlet of the ram may slow this harmonic to a good rate?

    Any additions to this plan?

  2. #22
    Silver Member
    Join Date
    Dec 2003
    Posts
    120
    Location
    UP of michigan
    Tractor
    L48 Kubota

    Default Re: Jerky project cylinder action

    The valve is a 25 gpm and the pump is able to do 18 to 20 gpm at3000 rpm.
    I have only run it at about 2400 to date and the psi relief on the valve at 1500 against the restriction of the ram causes a stall. I was thinking of a new low pressure cart in the valve to drop the stall chance if I do not get a new valve?
    Gray

  3. #23
    J_J
    J_J is online now
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    15,794
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Jerky project cylinder action

    Where do you think you have high back pressure?

    The only time the cyl or motors are developing full presure is when the motors are working very hard.

    If you were to install a hyd gage n the IN port of the first valve, you can see the exact pressure that the hyd system is developing.

    Hyd test set. Cost about $30

    You can determine at what pressure will stall the engine.

    You probably need to run that engine at max or get a larger engine.

    How deep can you drill given the torque on the hyd motors?

    Are you drilling while trying to raise the boom?
    Attached Thumbnails Attached Thumbnails Jerky project cylinder action-3000-psi-hyd-test-gage   Jerky project cylinder action-3000-psi-hyd-test-gage  
    J.J.

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

    Git er done.

  4. #24
    Silver Member
    Join Date
    Dec 2003
    Posts
    120
    Location
    UP of michigan
    Tractor
    L48 Kubota

    Default Re: Jerky project cylinder action

    Just thought of an experiment to try?
    I could run the head rotation and trigger the mast valve to see if this artificially lowers pressure and flow to see if the ram behaves?

  5. #25
    Silver Member
    Join Date
    Dec 2003
    Posts
    120
    Location
    UP of michigan
    Tractor
    L48 Kubota

    Default Re: Jerky project cylinder action

    Just got your post and will examine it for ideas. Then respond.
    Thanks again for your help

  6. #26
    J_J
    J_J is online now
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    15,794
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Jerky project cylinder action

    Each component will develop it's own pressure.

    You can limit the relief pressure on the last valve, which is the cyl valve, and that will limit the load you can raise.

    What is the pressure rating on the hyd motors, and what configuration are you using. Series or parrallel.
    J.J.

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

    Git er done.

  7. #27
    Silver Member
    Join Date
    Dec 2003
    Posts
    120
    Location
    UP of michigan
    Tractor
    L48 Kubota

    Default Re: Jerky project cylinder action

    JJ,
    The motors are rated at 1500 psi.
    The valves are in series with the motor contol valves with a power beyond to the ram valve.
    I have not tried running the motor then trying the ram at the same time?

  8. #28
    Silver Member
    Join Date
    Dec 2003
    Posts
    120
    Location
    UP of michigan
    Tractor
    L48 Kubota

    Default Re: Jerky project cylinder action

    I have a gauge at the pump but not able to read it while alone.
    The motor is rated to a 300 ft. If at full load but I do not expect more than 150'.
    No try with both motor and ram at the same time yet.
    My thought was that the cylinder size and shock along with all unused flow having to go through the relief valve causes the engine stall? Like when valved only into the ram, it takes almost nothing so the rest of the flow gies to the relief valve at 1500 psi so I have instant 1500 psi braking pressure?
    Gray

  9. #29
    J_J
    J_J is online now
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    15,794
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Jerky project cylinder action

    Do you have the two spool valve set at about 1450 psi?

    Now by doing that, the next valve is limited to 1450 psi, so it should be set the same, and that will limit the max load.

    Do you have to hold the spool lever for the hyd motor, or is there a detent.

    There are spool valve made specifically for hyd motors. There are also solenoid valves for hyd motors.

    If the valves are in series, and you are using the hyd motors at half lever, then you still have half flow for the ram. Even that may be to much for steady and smooth operation.

    Try this using the ram. Use a little bit of lever to allow a small amount of fluid for the ram. The fluid not used is passed on to the tank.
    J.J.

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

    Git er done.

  10. #30
    Silver Member
    Join Date
    Dec 2003
    Posts
    120
    Location
    UP of michigan
    Tractor
    L48 Kubota

    Default Re: Jerky project cylinder action

    I have them both set at the lowest psi,,,,1500.
    Yes, one will override the other if the valve is on but if off the power beyond should allow full flow and pressure to the second valve?

    I am not sure right now as I am in a meeting. I may have a load control in my valve as it will hold the mast at any angle if running or not. Does this mean I have a load control?

Page 3 of 12 FirstFirst 123456 ... LastLast

Similar Threads

  1. Hydraulic cylinder jerky
    By yarg in forum Build-It Yourself
    Replies: 25
    Last Post: 03-14-2013, 09:53 PM
  2. Help with basic project, double acting cylinder
    By Luciano in forum Hydraulics
    Replies: 15
    Last Post: 01-22-2013, 05:32 PM
  3. SA, Single Action and DA, Double Action
    By AKKAMAAN in forum Hydraulics
    Replies: 8
    Last Post: 01-18-2011, 06:52 AM
  4. Single action or double action Valves?
    By Firefighter Kubota in forum Hydraulics
    Replies: 11
    Last Post: 01-17-2009, 10:46 AM
  5. jerky, jerky, who's gotta smoker recipe for jerky
    By RobertN in forum Rural Living
    Replies: 4
    Last Post: 10-03-2005, 09:09 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
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.