Stahl Liebherr 922

    Hello i have recently just purchased this new machine, i sometimes find the hydraulics a little slow would changing the oil help me? or will i need a better pump?

    Thank you Calum

    Hi Calum,

    Changing the oil won't improve the performance of your excavator. I would suggest installing a brushless pump, although I am not familiar with the LIebherr 922. You might get a higher speed and more power with it. But maybe someone in this forum who owns a Liebherr 922 could better support you?

    Good luck.

    Kind regards :Winker:
    Bjoern

    Hi Calum


    I believe its a used machine as the producer for the chassis doesn`t exist anymore.

    You never know what the preowner has experimented with the machine.

    But the producer for the hydraulic system is still existing.

    In the normal configuration the hydraulic system is sufficent.

    Check:

    - Is the oil clean?

    - Is the filter clean?

    - Do the valves open correctly to the full extend?

    - Does the pump produce enough pressure?


    Hope I could help a bit.


    greetz chris

    I meant to say it was 'new' to me..

    I changed the oil in the digger and the only way to make the movements quicker is to adjust the pressure screw. It works well and is able to dig outside
    Would there be a motor better suited to the Leimbach pump?

    Calum

    Hi Calum


    Again the question: Do the valves open to the full extend?

    As i said, in the normal configuration the speed of the system is sufficent.


    There is a set of a brushless-motor for the pump available that increases the pumps rpm.

    But it increases tear and wear of the pump.

    And increasing only the pressure easily blows your hoses.

    Up to 12 bar should be enough.


    greetz chris

    Hello Chris, thank you for the reply

    Can you tell me the best way to check the valves are open completely? I use a Robbe f16 the end points on the servo's are all set at 100% but for the main boom I have to manually set the servo or the valve will stay open causing the boom to lift.
    This could be my problem, is there a way I can set the servo's?

    Greeting's Calum

    Hi Calum

    With an F16 it is a little bit complicated.

    The valves come with relatively big screws separatly.

    Now the method to adjust:

    - take off the servo from the valve and and set it with the F16 to the neutral-point.....trimming should be zero.

    - then take one of the big screws and figure out the close-point (neutral-point) of the valve by screwing it by hand.

    - of course the oilpump should run during that process.

    - then fasten the servo again with the valve.

    According to my experience this is the best method to adjust the valves without a computerized RC.



    May be the pic helps what i mean.......


    greetz chris