1. 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!
  2. ALL NEW MEMBERS READ THIS FIRST!! Thank you for joining Heavy Equipment Forums! If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered. After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges. Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!!

CAT 304e2 Bucket Drift

Discussion in 'Compact Excavators' started by bradleyt0515, Aug 20, 2022.

  1. bradleyt0515

    bradleyt0515 Member

    Joined:
    Apr 17, 2020
    Messages:
    11
    Location:
    NY
    2018 Cat 304e2 CR.

    When the bucket is extended out it slowly drifts down. What could be the culprit?
     
  2. skyking1

    skyking1 Senior Member

    Joined:
    Nov 3, 2020
    Messages:
    4,183
    Location:
    washington
    does it stop drifting down when you raise the safety lever and shut off the pilot controls?
     
  3. Chrisso

    Chrisso Well-Known Member

    Joined:
    Apr 6, 2021
    Messages:
    227
    Occupation:
    Diesel Mechanic
    Location:
    Australia
    Also, to stop any confusion, when the bucket cylinder is extended the bucket is in the curled position. If i interpret you correctly, what you're saying is the bucket drifts back down which means the bucket cylinder would be retracting while drifting.

    Or does the whole boom drift down when you poke the bucket all the way out?
     
  4. bradleyt0515

    bradleyt0515 Member

    Joined:
    Apr 17, 2020
    Messages:
    11
    Location:
    NY
    When the bucket cylinder is retracted (bucket extended out, not curled) the bucket slowly drifts downward so the cylinder is essentially drifting outward. Bucket drifts towards the curl direction.

    Hope that makes sense
     
  5. skyking1

    skyking1 Senior Member

    Joined:
    Nov 3, 2020
    Messages:
    4,183
    Location:
    washington
    OK.
    Start the machine cold.
    Let it warm up and do nothing.
    Once it has warmed up the hydraulics, pick up the boom and stick, then hold the bucket in the curled position in bypass.
    If the cylinder is leaking internally, it will warm up.
     
  6. Chrisso

    Chrisso Well-Known Member

    Joined:
    Apr 6, 2021
    Messages:
    227
    Occupation:
    Diesel Mechanic
    Location:
    Australia
    Skyking's question in post #2 is important, that can rule out a leaking pilot solenoid and the electrical side of things.

    If you can establish the cylinder isn't leaking internally, try swapping these line reliefs...


    upload_2022-8-22_0-42-38.png
     
  7. uffex

    uffex Senior Member

    Joined:
    Jan 23, 2012
    Messages:
    3,141
    Occupation:
    Admin
    Location:
    Lincoln UK
    Good day
    Attached maybe of help, be aware that the boom & arm has creep prevention, whereas the bucket relies totally on the spool fitting in the slice. This results in a higher leakage for the bucket, checking the creep rate against specifications may save a lot of unnecessary work.
    Kind regards
    Uffex
     

    Attached Files:

  8. bradleyt0515

    bradleyt0515 Member

    Joined:
    Apr 17, 2020
    Messages:
    11
    Location:
    NY
    I raised the safety lever and the bucket continued to drift towards the curl position.