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Cat 320D Hydraulics temps rising

Shivan Dookeran ยท 2021-03-25 21:24

Hello friends, i am having a temperature problem with my cat 320d KGF machine where when i work it for a while the temp keeps rising till it reaches the red. I have changed all the filters including the pilot filter, return filter , cleaned the in tank screen and even sent off the cooler to be cleaned and checked, the only thing i found odd was bits of hose stuck in the return filter, Machine works fine just a bit sluggish but all functions work well, anyone have a hydraulic schematic i can use to possibly troubleshoot why the temperature keeps rising and how i can solve this problem ?

Replies13
  1. #1heymccall2021-03-25 22:17

    Electroviscous fan clutch?

  2. #2Nige2021-03-26 12:28

    Here's the hydraulic schematic.

  3. #3Shivan Dookeran2021-03-26 20:34

    thought of this but wont both temps be rising? how do i diagnose fault with the fan ?

  4. #4Shivan Dookeran2021-03-26 20:35

    much appreciated

  5. #5Per Eriksson2021-03-27 02:51

    Only hydraulic temp rising? Do you have an infrared temp gun, if so measure the temp to and from the cooler. You say sluggish, go ahead and verify the relief settings for all functions and the main relief, if one or more is low that will create alot of heat. Any function drifting, could indicate bad seals in that cylinder and that also creates heat. How much do you track, could be bad seals in the swivel. Or the bypass valve on the back of the main valve has come apart not directing flow through the cooler.

  6. #6John C.2021-03-27 11:43

    Does that machine have an extra hydraulic cooler and the hydraulic driven fan motor?

  7. #7Per Eriksson2021-03-28 08:10

    No, they are all bunched together in front of the engine fan.

  8. #8Shivan Dookeran2021-03-28 20:55

    thanks for the reply , will verify settings as soon as i receive my set of gauges . no functions drifting all work well just a bit slow tracking is minimal as machine works as a site machine digging and loading dirt

  9. #9Shivan Dookeran2021-03-28 20:56

    btw how can i verify if the bypass valve is working as it should? pressure readings ?

  10. #10Per Eriksson2021-03-29 14:36

    if it works the flow to the cooler should be atleast as warm as the return to the tank.

  11. #11Shivan Dookeran2021-03-31 05:22

    thanks for the replies bro

  12. #12Shivan Dookeran2021-03-31 12:00

    ok opened it up and inspected there was no visible debris however one of the adjustment screws was alot slack compared to the other valve assembly . what is the proper way to reinstall it ? any service instructions?

  13. #13Per Eriksson2021-03-31 16:33

    I don't have any setting dimesnions for them. Which one was loose? The bottom one regulates the flow through the cooler, if it opens easy the flow through cooler will be less, so you could try tightening that a little and see if it improves the cooling.