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Thread: Hitachi EX60 - Hydraulic Leak - Slew Motor or Centre Joint

  1. #1
    Junior Member
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    Jan 2017
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    Norfolk, UK
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    Hitachi EX60 - Hydraulic Leak - Slew Motor or Centre Joint

    I'm hoping from some guidance about the best way to identify where my leak is coming from

    It's an EX60-1 and I noticed oil spilling out of the ring gear. Pretty certain it's hydraulic and the level of hydraulic oil has dropped. There's no oil on the top side of the structure around the swing motor or centre joint and none of the pipes appear to be leaking. Swing motor gearbox oil level appears correct (although thinner oil than I expected).

    I slid underneath and there is a coating of oil over the bottom of the centre joint. I took the small plate off the bottom of the undercarriage that accesses the void inside the slew ring and drained out about 5 litres of water (!) followed by 10 litres of hydraulic oil. Once empty I could see up inside with a mirror but no obvious sources of the leak.

    When the engine is running there is a steady trickle of hydraulic oil from this opening but I can't see where it's coming from. Everything operates correctly but there's no change in the rate of oil leaking when I use any of the hydraulic circuits (incl slew, blade or tracks).

    Any guidance that you can suggest to help point me in the right direction would be much appreciated.


  2. #2
    Senior Member
    Join Date
    Mar 2009
    Location
    Queensland & Far Sth Coast NSW Australia
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    403
    Reckon it's the centre joint. If it was the slew motor then the slew gearbox would be chocker block full with hydraulic oil.

  3. #3
    Junior Member
    Join Date
    Jan 2017
    Location
    Norfolk, UK
    Posts
    4
    Thanks for the quick response. You got me thinking about the slew gearbox so I've been having a look tonight and realised that what I thought was the mark on the dipstick is a scratch and and the level is double the height up the dipstick that it should be ie about 1 1/2 in. But whilst it's clearly overdue for a change it's definitely thicker than hydraulic oil and smells like gear oil ( I hate that smell ). Running up the machine and leaving it idling for a while and the level doesn't change.

    Now I just need to decide whether to change the slew gearbox oil and get it to the right level and then see if it changes....or just bite the bullet and drop the centre joint out

    I guess if I supported the centre joint and loosened off the bolts holding it to the undercarriage chassis and dropped it an inch (if the pipes allow) I'd be able to see for certain if it's the culprit ?

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