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Subject: Leaking 90W Oil

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Ron and Mary    Posted 08-07-2015 at 23:16:02 [URL] [DELETE]        [Reply] [Email]  
  • Leaking 90W Oil
  • I bought a used brush hog recently in good structural shape, 5 1/2' wide. Got it home on trailer, filled w/ oil up to plug port on gear box. Next day found oil on trailer where it still sat. Refilled and brush-hogged about an acre. Good results. Lifted implement w/ 3 point hitch to look underneath. Fast drip. Machine is Sunshine by Modern (Beaumont, Tex.). Another sticker says Dragon Products. Found an owner's manual online. Seems there is an input seal and output seal. Any suggestions before we tear into it? Do we disassemble from above (take off gear box) or below (at blade hub)?

    Dean    Posted 08-09-2015 at 15:13:06 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Leaking 90W Oil
  • Seeping 90W can usually be remedied by replacement of the 90W with CNH pourable high EP lube but if your leak is a fast drip, you will need to replace the seal.

    Usually it is the vertical shaft seal that leaks due to seal damage from wraping wire, etc., around the spindle shaft.

    Seal replacement is usually straight forward once the blade carrier is removed, which can be a challenge.

    I recommend using a FEL, chain hoist, come along, etc., to turn the mower upside down to remove the blade carrier. Depending upon design, copious amounts of good penatrating oil (not WD40), large hammers, heat, and inappropriate curse words may be in order.

    Cannot tell from your photo, but if that is a HD 80 HP rather than 40 HP gearbox and you decide to replace it, I have a NOS gearbox of that design that I will sell reasonably.


    Ron Mary    Posted 08-12-2015 at 01:17:59 [URL] [DELETE]        [Reply] [Email]  
  • Re: Leaking 90W Oil
  • Thanks for the input Dean. I've been on the road a few days & just got back to this post. It is a fast leak, so we get to play find the seals and will replace all we can locate, starting w/ the one you suggested. We have time to let the penetrating oil work so that's good. I'll let you know on the gearbox, but would like to fix what we have.

    Ron and Mary    Posted 12-29-2016 at 20:47:52 [URL] [DELETE]        [Reply] [Email]  
  • Re: Leaking 90W Oil
  • I had forgotten this post and just ran onto it again. Dean was right about what seal was leaking. We finally got the blades off from underneath with loads of PB Blaster, heat and a neighbor’s impact tool that was bigger than ours. Mary coerced the new seal into place and we finally got it back together. I have used it on three smaller projects now without a single leak. I brush-hogged my neighbor’s woods for a couple of hours one day and he told me I could do it again anytime I was in the mood. I am pleased to have a heavy duty brush-hog for just a little over $500 when that amount won’t even buy a light gauge new machine anymore. We’ll be taking it to hog our Mo. property once bow season is behind us.

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