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!!

Final drive leak Hitachi ex60ug

Discussion in 'Excavators' started by Tomco, Jul 17, 2022.

  1. Tomco

    Tomco New Member

    Jul 17, 2022
    Hi all I guess this question has been asked before but the final drive on my little Hitachi is leaking hydraulic fluid and I just had a question
    Is it only gear oil that the cone seals keep in or does hydraulic oil also rely on the duo seals
    Or is it possible to just remove the motor and service the seals whilst leaving the gearbox in place
    I removed my opposite side and found the duo seals were ok just needed to do the motor seals
    It's way quicker to remove the motor and do a seal replacement
    Any thoughts greatly appreciated in advance regards Tommy in Australia
  2. Tones

    Tones Senior Member

    Mar 15, 2009
    Ex land clearing contractor, part-time retired
    What usually happens is the seal on the motor output shaft fails and then hydraulic oil is pumped into the hub gearbox which then gets over pressurised and then the duo cone seal leaks. Some motors can be removed without touching the hub except the sun gear should be removed as part of the process. Seal failure is usually due to worn bearings so they should be looked at as well at this time.
    If you are doing this job yourself it's crucial the hydraulic motor is full of oil before starting the machine at the finish or you could be up for a new motor.
    BTW welcome to HEF. Where on the big brown land do you hail from?
    Last edited: Jul 17, 2022