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  1. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    The generic duocone seems to have worked fine and I have maybe 8-10 hours on it with no leaks. I used grease to seat it into the hub. I did only one side but resealed the motors and brake seals on both sides. The dealer was the only place I could find the specialty D shaped urethane brake...
  2. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Id like to do the motor shaft seal. Can I simply split the case, pull out coupling/bearing assembly and replace the seal? No flying pistons I hope. The manual makes it look fairly simple if you aren't replacing bearings or taking the valve assemblies out. I don't have a great situation for...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Thanks 92U, Its the uncertainty on something new (to me) that chews up loads of time so your and other members prior experiences are extremely helpful. I'm adding in what info I can find so in the future someone could go through this older machine with less uncertainty. If anyone knows a good...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Ive got the floating seal installed. I ended up converting to grease for the toric ring lubricant as the manual describes. The seal is springy concentric and has less than 1mm stack height difference around the circumference. Because there's grease on the o-ring its very easy to see it roll as...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Thank you Nige, a helpful article, seems getting them inserted uniformly could be nearly impossible without the wire spacer. My Hitachi manual definitely says to grease the Toric ring so I'm a bit conflicted but the alcohol fit seems to be more common. Hitachi also suggests a bamboo spatulla...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    I just noticed my ring gear has a reference mark that looks like the letter T. Does anyone know if this is an absolute reference to something such as Top? It could also be a relative reference that helps you clock the ring gear for the knock pin holes? Screws up my plans to punch the nut home...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    OK thanks 92U that is good to know, I cant think of another situation where Ive seen an oring loaded with a rotational force like that. The seal has a fair bit of drag in total but is maybe actually low for all the contact surface at work. Is the failure generally at the bottom where rust has...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Got the knock pin to budge. The oring for one of the floating seal halves was broken. Odd it looks like the oring was brittle and broke but it was still reasonably soft and springy. It failed right where the case is a bit rusty.
  9. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Thank you Dave, I don't understand the knock pin. Do I drive it deeper and below the nut so the nut can turn? Its already recessed below the top face of the nut a bit but. Feels like its a very tight fit. Gears all look very clean and unworn, no sign it ever ran low on oil. Realized today...
  10. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Anyone know what size or standard of the orings for the drive motor pipes? The pipes for forward and reverse seem to be roughly 3/4" and have a flat face with an oring groove. The return looks to be a taper flare and no oring. The brake piston orings are definitely shot, haven't seen the...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Ah! now I don't have to find that extra long drift. I owe you an hr or two. With that clearance I could probably strap a hydraulic jack on it, but Ill start with the hammer. Thanks
  12. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    I found the pins and it looks like they have no circlip and are maybe a taper fit. They have drift marks on the protruding side and are recessed on the other side. Ill try a bit of pounding today. Torch set is an hr away and I'm working out of my van so Ill try really hard with the sledge...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    I see two concerns for getting things apart on the drive motor: 1) How hard is it to drive the master track pin once I find that circliped pin? 2) The very large bearing nut wiith really high torque 360ft/lbs. I can make a spanner if I have too but would be easier to order one if there are...
  14. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Thanks for all the help here everyone, the feedback not only has valuable info but gets me thinking next steps. Dave, I was able to use the AVS catalog you'd suggested in prior EX60 posts to cross 60G to 60-1 and get my drive seal parts ordered in time for Friday. Even though the motors are...
  15. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Yes the thumb switch could be sticking its action is flakey even after I cleaned and oiled it. Its actually two microswitches taped together and it could be that one is normally off and the other is a toggle to give automated return, I wasn't that observant when testing it. Turned out that the...
  16. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    That sounds good Dave, Thanks. I see only the regular pilot valve on the EX60G but it does have a wire. That may be part of the fluid heating circuit control. Regardless I should be able to plumb a valve like you suggest to bypass the pilot pressure so nothing can activate. Maybe Ill start...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Well good to know going in so I can get staged for it. I see the link "tool", I thought it was implying a full interference press fit but it looks like theres a circlip retaining the pin. What sort of force should I expect? Can I likely drive it with a drift and sledge? OK I will grease...
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    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Thanks Dave and 92U its great to have experienced input on this. I would like to minimize the down time for sure, so Ill get 2x of all seals for the drive motors. I'm trying to figure out if the ex60-1 seal kits will interchange with the ex60G otherwise I have individual #s for the ex60G...
  19. E

    Hitachi EX60G Gear oil leaks onto inside of sprocket as I'm filling planetary

    Hello, I just brought home my first excavator, an EX60G. Its been seeping oil onto the inside of the sprocket since it came off the trailer and continues to leak even when its not running. When I checked the planetary it was down and took a couple quarts but while filling it I noticed it was...
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