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  1. Jon_one

    Komatsu pc200lc-6 PC / Ls valve adjustment

    Hello all . does anyone have any experience doing this procedure without the differential pressure gauge specified in the manual ? someone somewhere decided to change the seals in these valves without my consent and threw off the adjustment on these valves . now this machine is not working...
  2. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    has anyone ever replaced swivel seals on this machine ? i am ordering a seal kit from Plant parts . never done this before so any advice will be helpful . does it pull straight out when hoses are removed ? do all orings and seals go into the barrel ? is it necessary to have the...
  3. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    Thanks alot John . i will do these tests as soon as i can .
  4. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    Does anyone know what a High unload pressure mean ? Komatsu Pc220Lc-6L Just experiencing some issues and i want to know if this can be a cause ? the book says 30-40 kg/cm2 and i am getting 100
  5. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    Thanks alot for the advice i am going to try swapping the travel reliefs . i dont think the case drain is high but i will check this . is there an easy way to do this ? do my strangely high unload pressures mean anything ?
  6. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    i will change the LS relief valve and see if i get any change ... and also check to see if i can get a set of new pressure compensators for this machine .. what i noticed today and i think this is something that is important .. i never took my unload pressure into thought.. my unload...
  7. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    no i havent . maybe this weekend i will get time to do this .. no more info on compensation valve seal failure and also remedies ? also with the LS relief valve catridge failure was the remedy just a seal over ? or a full replacement ?
  8. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    ok i will try this .. so one bad compensator can cause everything to slow down drastically ? also what seals do the tvc - ls valves (the pump mounted valves) contain that go bad and cause problems ? i read this somewhere about those seals but the post did not have much detail on this ...
  9. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    ok so today i think i had a little breakthrough , i was relieving one of the track circuits and then relieving the boom and the arm started creeping in just a little , just barely moving .. so this has to be a compensator issue .. i was also thinking that maybe the compensator for one of the...
  10. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    very nice . i got alot of ideas now
  11. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    John , what is the best gauge combo to do the differential pressure test and any other tests for this machine ? i currently have a 10,000 psi , 3000 psi and 1500psi . i am about to buy some new gauges and just want to know what is usually used . and what length hoses would you guys use ?
  12. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    based on what i see and also my book , the LS valves are on the same place as the TVC valves which is on the pump mounted as one unit . i do have two spare units lying somewhere around . i will do a Differential pressure test , try adjusting and if no change i will swap the ls valve on the...
  13. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    my serial number is A80771 PC220LC-6L today i am going to do some more tracing
  14. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    ok so i switched the main pump lines and the problem switched sides . so now all along i thought it was the front pump that was not stroking up when the reality is because the lines were not on correct it is the rear pump that is not stroking as it should .. tomorrow i am going to do a...
  15. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    if any one can shed some light on this for me because it seems like some are mounted opposite or maybe it is an error . i will try mounting the other way and see if i get any results ? Maybe this explains why the front pump was not stroking up when it was suppose to .
  16. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    ok so i found an error that me and my service manual made .. i have two different service manuals and the two of them have the main pump lines going to control valve marked in different places . it looks like one had an error . so i need to switch my main pump lines back to normal . the LS lines...
  17. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    ok i will do this . just have to make two more hoses and one more gauge
  18. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    ok for starters everything associated with that pump with the pumps split is slow . not so weak . tests are always carried out in H/O mode so i am talking about arm , LH track and swing .. they are all slow . it was the other way around before i switched the LS lines and Pump lines . meaning...
  19. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    i will do this today . but i can tell you that the weak track has a cycle time of over a minute .. but the weak track and arm are on the same circuit .. would this be a merge situation also ? and will the merge affect travel speed ? and if i pull in the lever right in it would not work no other...
  20. Jon_one

    safety suction valve, arm and boom check valve, Komatsu Pc220Lc-6L

    so what can cause the track to speed up when the stick is pulled in slightly ? very noticeable speed difference in weak track (front pump) .. and very slight difference in other track (rear pump) The weak track barely builds pressure , the better track almost reaches relief pressure...
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