1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!
  2. ALL NEW MEMBERS READ THIS FIRST!! Thank you for joining Heavy Equipment Forums! If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered. After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges. Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!!

Hydraulic noise

Discussion in 'Forklifts/Telehandlers' started by SouthOnBeach, Mar 4, 2008.

  1. SouthOnBeach

    SouthOnBeach Well-Known Member

    Joined:
    Apr 29, 2007
    Messages:
    130
    Occupation:
    jack of all trades
    Location:
    Westren North Carolina
    Got 2 questions. First is kind of a general one. I’m getting a noise, like a banging/surging (kinda like water hammer in pipes) of hydraulic fluid when it’s at higher rpms. (i.e. driving or when you crank up the rpms lifting) my first thought was the pump is going. But then I was thinking maybe something in the valve body is causing it. Anyone have some ideas??? :beatsme

    Second question is on a lull 644D-34. Same machine as the hydraulic noise problem. Does anyone know if you can change the hydraulic filter without draining the tank? I really don’t feel like having 33 gallons pour out when I’m not prepared to contain it all. :eek:
     
  2. Speedpup

    Speedpup Senior Member

    Joined:
    Jul 7, 2007
    Messages:
    1,214
    Occupation:
    President and all else that needs done!
    Location:
    New York
    all Lulls I have seen the filter comes out the top of the tank so yes
     
  3. will_gurt

    will_gurt Charter Member

    Joined:
    Nov 30, 2003
    Messages:
    163
    Occupation:
    operator in extended holding pattern
    Location:
    southwestern ,PA
    WHat you may be hearing is some form of cavitation. This can be very detrimental for your pump. Is the fluid level good? Check for leaks on both suction and pressure lines.
     
  4. Iron Horse

    Iron Horse Senior Member

    Joined:
    Jun 9, 2008
    Messages:
    761
    Location:
    ,
    You've probably fixed it by now but if you hav'nt i would say the suction line is sucking flat momentarily at full noise . I have diagnosed it before and have fixed it using reinforced suction hose .
     
  5. SouthOnBeach

    SouthOnBeach Well-Known Member

    Joined:
    Apr 29, 2007
    Messages:
    130
    Occupation:
    jack of all trades
    Location:
    Westren North Carolina
    I really haven't got it fixed yet. it only does it once and a while for just a few seconds. so i'm having somewhat of a hard time tracking it down. I will keep the suction line in mind.
     
  6. Iron Horse

    Iron Horse Senior Member

    Joined:
    Jun 9, 2008
    Messages:
    761
    Location:
    ,
    If you have ever seen a lay flat water hose with a kink over a gutter hammer , it is the same type action . Get someone in the machine to make it happen while you watch the suction line .
     
  7. Johnsoils

    Johnsoils Site Sponsor

    Joined:
    Jul 29, 2008
    Messages:
    72
    Location:
    Iowa
    Does the problem go away after the machine is warmed up? If so your pump is cavitating because the oil is not flowing when it is cold. In Iowa and Minnesota, switching to a synthetic pays big dividends and saves fuel burnt on warming up the hydraulics. Read more about synthetic hydraulic fluids on my web site: www.johnsoils.com

    Note the cold flow capabilities of the synthetic oils. If the problem is there cold or hot, then I agree with the folks that are pointing you to a suction line restrication or collapsed suction line. Good luck, cavitation is bad on pumps and motors. Have you done an oil sample analysis to see if you have done any damage to the system?
     
  8. donsoil

    donsoil New Member

    Joined:
    Jul 27, 2008
    Messages:
    4
    Location:
    iowa
    the problem sounds like aeration or cavitation, another thing to check is the suction tube inside the reservoir, I had one that cracked and broke due to vibration on a cat 988 wheel loader, it caused the hydraulics to be intermittently jerky depending on how high the boom was raised. another thing to consider is the oil return pipe going into the reservoir, if a crack or broken tube has caused it to change the designed flow it could cause an aeration problem.
     
  9. Lost_Odeassy

    Lost_Odeassy Member

    Joined:
    Aug 7, 2008
    Messages:
    7
    Location:
    Dubai
    Telehander stopped working

    sorry about posting here but do not have permission to make new threads yet

    Hi guys,

    I have JCB 2001 model tele handler 170-541 and this morning while on jacks loading it stopped working all of sudden, basically its not getting started and nothing is working, engine, jacks, boom.

    Mechanic is saying that clutch plate is gone and nothing will work because everything is integrated

    Needs some word of advance anyone else experienced similar stuff in past?

    Regards, Irfan.
     
  10. Iron Horse

    Iron Horse Senior Member

    Joined:
    Jun 9, 2008
    Messages:
    761
    Location:
    ,
    If it's on an angle the tilt switch has probably sensed an unsafe condition and shut the controls down .
     
  11. Lost_Odeassy

    Lost_Odeassy Member

    Joined:
    Aug 7, 2008
    Messages:
    7
    Location:
    Dubai
    Thanks for quick reply it is some i know who was operating and i am not expert in it but where it tilt switch yes the machine was at angle loading the stuff, how can we re-set switch appericate guidance. thanks
     
  12. Iron Horse

    Iron Horse Senior Member

    Joined:
    Jun 9, 2008
    Messages:
    761
    Location:
    ,
    The computor will usually allow the boom to be lowered , if that's what has happened . Once down , the power to the rest of the controls will resume .
     
  13. Lost_Odeassy

    Lost_Odeassy Member

    Joined:
    Aug 7, 2008
    Messages:
    7
    Location:
    Dubai
    well basically the mechanic said clutch plate is gone, so he put the new one, the part cost around 800 pounds or 4500 dhs in dubai and 250 pounds for mechanic charges, around 2000 dhs in other words last month profits is almost gone, took mechanic 5 - 7 hours to repair.
     
  14. Iron Horse

    Iron Horse Senior Member

    Joined:
    Jun 9, 2008
    Messages:
    761
    Location:
    ,
    Did it fix it ?
     
  15. Lost_Odeassy

    Lost_Odeassy Member

    Joined:
    Aug 7, 2008
    Messages:
    7
    Location:
    Dubai
    yes it fixed it...
     
  16. pudding

    pudding Member

    Joined:
    Oct 22, 2008
    Messages:
    7
    Location:
    New Zealand
    southonbeach did you sort the problem?

    a blocked suction filter on a machine can cause cavitation of a pump at high rpm, so can a hose collapsing, or a releif valve problem, so can low oil

    also on some hyster forklifts the pump is driven by a short double chain that is no adjustable, not saying your machine has this, but when this chain wears on these machines, they slap, this also causes a 'hammer' effect when you deadhead the machine or operate at high rpm......food for thought