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Attempting to repair pilot valve 345BL

Discussion in 'Excavators' started by Jeremy Whittaker, Nov 30, 2022.

  1. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    I'm going to attempt to repair my pilot valve that is leaking hydraulic fluid. I found the blown-up version of it in SIS. But nothing that explains how to take apart the armrest or disconnect the hydraulic lines. Is there a manual or something that explains how to replace these?
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  2. heymccall

    heymccall Senior Member

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    It all comes out the top. You'll need 4 at #22 & 4 at #23.

    I've done them in machine (still mounted) before. It is imperative that the tank pressure be relieved. And, the best way to eliminate oil loss in the cab is to to disconnect (after carefully marking) the 6 lines under the cab floor, IF they go to a bulkhead connection. Some machiness pilot hoses go to a bulkhead, and some go all the way to the main control valve and tank.
     
    skyking1, Nige, uffex and 1 other person like this.
  3. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    Just to make sure I understand...

    1. Open the hydraulic tank to relieve pressure.
    2. I can leave it connected and work on it in the cab without removing the 6 hydraulic lines but I risk leaking oil?
    3. Order quantity 4 of PN 22 & 23.
    4. Replace those and put it back together.

    Pretty easy repair? Or any surprises I should watch out for?

     
  4. Nige

    Nige Senior Member

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    G..G..G..Granville.........!! Fetch your cloth.
    Here are the procedures from the service manual to both R&I and D&A the pilot control. It may help you.
     

    Attached Files:

  5. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    Thanks!

     
  6. Dave Neubert

    Dave Neubert Senior Member

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    Just unscrew the joy stick and the vlves come out of the top no need to tke valve out wont lose much oil just do one at a time
     
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  7. Bluox

    Bluox Senior Member

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    When you remove the plate be careful those plungers sometimes come out like rockets.
    If the seal carriers don't pop right out cover the valve with a rag and tap the plungers with a hammer.
    You need 4 of #23 seals and#4 o-rings .
    Cat should have a seal kit for this valve.
    Another set of hands will come in handy.
    Bad Bob
     
    Last edited: Dec 3, 2022
    skyking1 likes this.
  8. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    I ordered
    4 - #23
    4 -#22

    Are you saying there is another valve seal kit I need to buy? How do I reference this?

     
  9. heymccall

    heymccall Senior Member

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    No, he's say I screwed up. You need #4 seals, not #22 carrier.

    22 are metal and full reusable.

    My sincerest apologies.
     
  10. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    Wasn't sure if he was saying #4 or quantity 4. Thanks!

     
  11. Mobiltech

    Mobiltech Senior Member

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    Check number 7 joint for wear also. They can get pretty sloppy in the pins.
     
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  12. Nige

    Nige Senior Member

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    It appears that there are three different Part Numbers of pilot valve listed depending on the age of the machine, and the repair parts are slightly different between the three of them. Can you see any P/N tag on your pilot valve.? 133-8873, 164-9497, or 193-1050.?

    Based on 19th October 1998 Date of Manufacture it appears that your machine 4SS01066 should have "Type 2" pilot control valves (164-9497) unless they have been replaced conmplete with the latest Type 3 valves at some time since.
     
    Gary Layton likes this.
  13. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    The machine is not near me I'll have to see if I can find one next time I'm out there.

     
  14. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    Can't find a model number anywhere on this thing.

    https://photos.app.goo.gl/RtZTXDXPmsxEmhux6

     
  15. Bluox

    Bluox Senior Member

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  16. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    Ah, I'll look for this next time I'm out there.

     
  17. Jeremy Whittaker

    Jeremy Whittaker Well-Known Member

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    I just wanted to take the time to say thanks to everyone on this forum who has commented or helped me fix something. I never would have attempted some of this stuff without the support of this group! Thanks!

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