• 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!

Search results

  1. G

    Kobelco hydraulic excavators

    I realy think that travel block is either defective or have some problem with piloting travel priorty spool. But how could I test that be sure? I could check pressure which come from A2 ( independant travel valve), but how could I see that servo pressure does not leak throgh travel spool and...
  2. G

    Kobelco hydraulic excavators

    Hi Mr. Kobelco, What you write is all true but is not the main problem. When I disconect the el .wire to Pf solenoid, all problems are still there and also engine stalls when you push pump to hard. If I tried realy hard to lift lift ful bucket of rocks I coukd lift it litle more quicker than...
  3. G

    Kobelco hydraulic excavators

    Hi Mr. Kobelco, Today I pass by machine and I quickly measure some values. 1.) I could read engine rpm. 660 rpm and pf=30 bar 1300 rpm and pf=16 bar 1500-2150 rpm pf= 20 bar 2.) Yes, but today I did not have the time to measure Pi1 and pi2. 3.) Last time wasboth Pi at full speed 48...
  4. G

    Kobelco hydraulic excavators

    Hello Mr. Kobelco, I was on Linde hydraulics service training in Germany and was not able to reply You faster than now. I will measure those values and than report to You next time when wisit this machine. Now when I see this machine shematis of hydraulics system when I close eyes, I think...
  5. G

    Kobelco hydraulic excavators

    Hello Mr. Kobelco, I still did not diagnose the couse of problem. One hose going on to the valve P2 is flexible and You can see when pressure raise there. I did not have stalling pin or simmmilar so I did not measure travel relief. I found one old block and I took out travel relief and I...
  6. G

    Kobelco hydraulic excavators

    Hello Mr. Kobelco, I replaced old pilot pump with new one (12 cc/rev, set pressure at max rpm to 50 bar) today and problem is the same. I think that machine works better up to certain oil temperature, beut when certain temperature leve isl reached problems is starting. Today I measured on tank...
  7. G

    Kobelco hydraulic excavators

    Hello Mr. Kobelco, One more think: I found up that in past somone repaired Kawasaki piston pump. And so he put there rear cover for 4 bolts gear pump with outer drain ( own relief valve) - like at SK200 mark6. And this 4 bolts gear pump is little bigger (10 or 12 cc/rev) than original...
  8. G

    Kobelco hydraulic excavators

    Hello Mr. Kobelco, Today I went back check again pilot line. At lovest engine idle I got 29 bar on P3 and at highest engine speed 50 bar. When I egaged lever lock the pressur felt down for 1 bar on 28 bar and recovered in1/2 second. Temperature of oil was 30 deg. C. Than I worrm up the...
  9. G

    Kobelco hydraulic excavators

    Hello Mr. Kobelco, Thank You for help. With oil will be hard to say. Certanly is to old and was changed two Years ago when owner put newly repaird pump on. But it is ISO VG 46 ( viscosity 46 Cst.) Here I can not teach owneres that oil and cleanless is very important. I measured the...
  10. G

    Kobelco hydraulic excavators

    Hello, Today I visit that machine again and I am not happy. Firts the machine model and serial: SK200 YNU0107 I have checked and Boom cylinders are not bypassing. Than I connect flow turbine to P2 and I record: 1.) cold oil 25 deg.C min engine rev. and S....19,2 l/min max...
  11. G

    Kobelco hydraulic excavators

    Hi MR. KOBELCO, Thank You for fast answer. I wish that would be the probem. Tomorrow I will firstly do what You suggest. If that would not be the case I will also have flow meter with me to see how each pump work under the pressure. Than I will be back with my results. Regards, Gregor
  12. G

    Kobelco hydraulic excavators

    Hello, I would be glad for good advise because this will eat my nervs... Problem is with Kobelco SK200 mark 3. The problem is that Boom does not have the speed like it should and also the power. When oil is cold the speed is there and power also. But when I heat the oil realy good speed...
Top