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Recent content by GTpesado

  1. GTpesado

    komatsu pc150-6 control valve parts

    I am looking for the whole control valve or the arm and bucket sections for the control valve on this machine PC150LGP-6K ser.# k35024 The arm and bucket drift a lot and i narrowed it down to leakage in the spools in the valve body....which also is causing the hydraulic system to overheat...
  2. GTpesado

    Komatsu Pc200-8 weak arm/stick out

    If the output of the pump is low. Is it not a problem on the signal side, or LS? But only for the stick. Would the quick return afect it that way?
  3. GTpesado

    Komatsu Pc200-8 weak arm/stick out

    I forgot to mention that cold you don’t notice it near as much, mabey a little slow but as it warms up it slowly gets worse. With about half an hr of operating, stick out is very slow….takes about 10 seconds to get the whole way out
  4. GTpesado

    Komatsu Pc200-8 weak arm/stick out

    Ok I see the quick return is on the other side of the section
  5. GTpesado

    Komatsu Pc200-8 weak arm/stick out

    boom or bucket…..it makes the stick really jerk when you as much as touch the other functions even before they start to move much. If you just touch the joystick it like cuts the pilot pressure to the stick for like a split second thus the jerk
  6. GTpesado

    Komatsu Pc200-8 weak arm/stick out

    Also when operating the stick and you touch another function the stick jerks I swapped 8 and 9. It calls it the arm and boom drift prevention, I thought that was the same as the quick return, mabey it’s a different valve
  7. GTpesado

    Komatsu Pc200-8 weak arm/stick out

    the seals have been replaced about a year ago....and the stick does not fall or drift at all. If the oil in the head side is leaking pass the seals to the botom side that fast should there not be terrible drift on the stick cylinder?
  8. GTpesado

    Komatsu Pc200-8 weak arm/stick out

    Hello friends I have a pc 200-8. Serial num. Kmtpc180h02355178 Stick out is weak and mostly slow. On monitor and verified with gauges. Both pumps put out 37.0 mpa . Stick in shows more like 31mpa but stick out only shows 26 mpa Things I did Swapped pressure compensators Swapped the boom...
  9. GTpesado

    cat e120b solenoid functions and track speeds not working

    thanks for your help….I was able to track the problem to a leak in the swivel joint. With the help of those amazing pdfs. The leak was between the right track and high speed pressure. Causing the motors to be in high speed as soon as the right track was activated Thanks a lot
  10. GTpesado

    cat e120b solenoid functions and track speeds not working

    What actually makes the track motor actually spin faster but with less torque
  11. GTpesado

    cat e120b solenoid functions and track speeds not working

    ok got it ....yes i have 24v to that solenoid but only one track works in slow speed....and weirdly it is opposite that what shows on the switch
  12. GTpesado

    cat e120b solenoid functions and track speeds not working

    I have a cat excavator E120b ser.# 6jf00046 Does any one have a schematic with the functions of the row of solenoids in front of the hydrualic pump? I know the first one is for the track 2 speed ....and basically i was wondering if each track has a seperate solenoid for the 2 speed because...
  13. GTpesado

    case 580sm series 2 slow backhoe functions

    would that get worse as it heats up? When it is cold it isjust so noticibly slow. stabilizers are weak at idle and boom up is slow compared to my other 580sm
  14. GTpesado

    case 580sm series 2 slow backhoe functions

    Hey guys I am working on this machine Case 580SM series 2 pilot controls ser.#N4C306330 The backhoe functions get slower as the machine heats up. Notice it mostly in the boom lift. when you activate any other function just a little the boom stops totaly. otherwise it is just very slow even at...
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