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  1. #1
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    Jun 2012
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    Flintstone, GA
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    John Deere 750 4wd

    Default trying to find bush hog leak (have pics)

    I was bushhogging, looked back, and saw oil spraying from where the bushhog connects to the pto shaft. I shut it down right away and watch it leak for awhile. It was coming out where the bushhog connector disappears into the housing (sorry, I don't know the technical terms).
    Today I took the front off the gear housing and the seal there looked fine and a bunch of oil poured out of the gearbox. So I don't think that seal was the problem. But I don't know what to do next. I don't really know what I'm doing at this point and don't want to take anything else apart that I might not be able to put back together. Any thoughts or advice?


  2. #2
    Veteran Member kebo's Avatar
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    Lexington, SC
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    2001 John Deere 790 4x4, bar tires

    Default Re: trying to find bush hog leak (have pics)

    It sounds like it was slinging fluid out from around the shaft that you pulled out. If so, then it needs the seal replaced. I would put in a new seal on the shaft, get a new gasket for the plate, and put it back together with some gasket sealant on both sides of the gasket. Fill it up with the proper oil and run it awhile and see what happens!! Good luck!
    Nothing could be finer than riding my JD790 in South Carolina!!

    2001 John Deere 790 4x4 with Model 70 FEL, 5ft International World Agritech bush hog, 5ft Wallberg BB, 5ft Frontier disc harrow, 5ft King Kutter II Rototiller, 5ft Cultipacker, 5ft Sitrex finish mower, Leinbach PHD with 9" & 12" augers, Leinbach middlebuster, Leinbach #11 Field Cultivator, boom pole, custom 3pt handi-hitch, clamp on bucket forks, Pat's Easy Change.

    Nothing runs like a Deere, or smells like a John....

  3. #3
    Platinum Member
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    Nov 2008
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    Covington, GA
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    JD 870

    Default Re: trying to find bush hog leak (have pics)

    Also note that there is sometimes a fill to here level. Things get more leaky if overfilled but I would surely replace that seal. By the way I like to polish the input shaft with some 240 grit emery cloth or black sandpaper which should knock down any sharp edges that might damage or cut your new seal.

  4. #4
    New Member
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    John Deere 750 4wd

    Default Re: trying to find bush hog leak (have pics)

    Quote Originally Posted by kebo View Post
    It sounds like it was slinging fluid out from around the shaft that you pulled out. If so, then it needs the seal replaced. I would put in a new seal on the shaft, get a new gasket for the plate, and put it back together with some gasket sealant on both sides of the gasket. Fill it up with the proper oil and run it awhile and see what happens!! Good luck!
    Thanks! That sounds right - where is the seal, and how do I replace it? Sorry to sound stupid - I think in my initial post I was thinking that the gasket was the seal. But it sounds like the seal and the gasket are separate things.

  5. #5
    New Member
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    John Deere 750 4wd

    Default Re: trying to find bush hog leak (have pics)

    Quote Originally Posted by JimRB View Post
    Also note that there is sometimes a fill to here level. Things get more leaky if overfilled but I would surely replace that seal. By the way I like to polish the input shaft with some 240 grit emery cloth or black sandpaper which should knock down any sharp edges that might damage or cut your new seal.
    Good idea - I'll do that once I figure out where the seal is and how to replace it .

  6. #6
    Veteran Member kebo's Avatar
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    2001 John Deere 790 4x4, bar tires

    Default Re: trying to find bush hog leak (have pics)

    As best I can tell from the pic, the seal is the black rubber piece right up against the shaft, including the thin sliver of stainess steel around the outer edge of the black rubber piece. That seal is most likely pressed in. Usually you have to dig them out with some sharp edged tools, just be careful to not damage the machined surface that it's pressed into. Or, if the whole shaft will slide out from the backside, you may be able to push the seal out from behind it. You'll just have to look at it and see what it takes.


    To put in a new one, first clean off the shaft and polish it with some fine grit emory cloth like stamello suggested. Put a light film of oil on the shaft. Slide the new seal down over the shaft. You'll need something that will fit over the shaft (if it wasn't removed) to be able to drive the new seal in with. If you have a press, that will work too. If not, a mallet should drive it in, using a piece of pipe to fit over the shaft, but you should still use something to protect the seal from getting damaged while its driven in, like maybe a piece of wood. You just don't want to be pounding on the rubber part with anything that might damage the new seal. I hope this makes sense!!
    Nothing could be finer than riding my JD790 in South Carolina!!

    2001 John Deere 790 4x4 with Model 70 FEL, 5ft International World Agritech bush hog, 5ft Wallberg BB, 5ft Frontier disc harrow, 5ft King Kutter II Rototiller, 5ft Cultipacker, 5ft Sitrex finish mower, Leinbach PHD with 9" & 12" augers, Leinbach middlebuster, Leinbach #11 Field Cultivator, boom pole, custom 3pt handi-hitch, clamp on bucket forks, Pat's Easy Change.

    Nothing runs like a Deere, or smells like a John....

  7. #7
    New Member
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    John Deere 750 4wd

    Default Re: trying to find bush hog leak (have pics)

    Quote Originally Posted by kebo View Post
    As best I can tell from the pic, the seal is the black rubber piece right up against the shaft, including the thin sliver of stainess steel around the outer edge of the black rubber piece. That seal is most likely pressed in. Usually you have to dig them out with some sharp edged tools, just be careful to not damage the machined surface that it's pressed into. Or, if the whole shaft will slide out from the backside, you may be able to push the seal out from behind it. You'll just have to look at it and see what it takes.


    To put in a new one, first clean off the shaft and polish it with some fine grit emory cloth like stamello suggested. Put a light film of oil on the shaft. Slide the new seal down over the shaft. You'll need something that will fit over the shaft (if it wasn't removed) to be able to drive the new seal in with. If you have a press, that will work too. If not, a mallet should drive it in, using a piece of pipe to fit over the shaft, but you should still use something to protect the seal from getting damaged while its driven in, like maybe a piece of wood. You just don't want to be pounding on the rubber part with anything that might damage the new seal. I hope this makes sense!!
    This is great, thanks. Now I'm trying to figure out where to get a new seal/gasket (I probably should have thought of this earlier). Are these standard sized things I could get at the TS store? Or do I need to order? I'm pretty sure this cutter is a New Holland 714GC . The shaft is marked 10 30 105 10 .
    Also what kind of oil should I refill with?

  8. #8
    Veteran Member
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    Mt Crawford Va
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    massey GC 2400 JD LA 145

    Default Re: trying to find bush hog leak (have pics)

    Also check to make sure the vent is clear as things get hot the air expands and if the vent is stopped up it has to go somewhere and can push oil out of a good seal.

  9. #9
    Super Member greg_g's Avatar
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    Western Kentucky
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    JD3720 Cab, 300X loader with 4-in-1 bucket

    Default Re: trying to find bush hog leak (have pics)

    Just take the piece you removed to the New Holland dealer. Ask them to replace the oil seal, then get a new front cover gasket from their parts dept. might want to consider a new vent/fill plug while you're at it

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

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