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  1. #1
    Platinum Member spruce Deere's Avatar
    Join Date
    Feb 2009
    Posts
    706
    Location
    Northmost Idaho
    Tractor
    John Deere 790 w/ 300 loader

    Default leaky 790 water pump, not even 500 hrs yet

    Noticed the coolant res. was just a little low last fall so I filled it. Unloaded some firewood logs shortly after then plowed snow later as it came. Thought I smelled anti-freeze plow'n once, but it was just a whiff and then nothing.

    Figgered Just for entertainment, I would pop the hood and look things over. Res was below the cold mark. So I looked a little closer and found the front of the engine looked "shiny".........I won't say the several words I said then

    I thought MAYBE it could be the o-ring between the pump and head, a two dollar o-ring and some of my time.... nope, then I saw the weep hole on the pump was weep'n the green.

    Now, its a $352.62 and some of my time, didn't make it to 500 hours and the water pump leaks

    Parts should be here monday
    790 JD W/ 300 loader
    Lots of implements for loader and 3pt
    Can't do it burn'n diesel, is not worth do'n

  2. #2
    Veteran Member SSdoxie's Avatar
    Join Date
    Jun 2010
    Posts
    1,911
    Location
    Cumberland Plateau, TN
    Tractor
    Bobcat CT225

    Default Re: leaky 790 water pump, not even 500 hrs yet

    Did you ask the dealer about a repair kit for it? Don't know if John deere offers it but some 15 years ago I worked quite a bit with Yanmar 3TN & 4TN engines and Yanmar had a seal and bearing kit to rebuild the water pump. Pretty simple to install, lower price, and worked great if the bearing hasn't worn into the housing. If you pay dealer to rebuild it's a trade off in their extra labor versus new pump, but if you do it yourself can save a few $.
    Dennis

    CT225 w/7TL QA FEL, 60"tooth dirt bucket, 68" smooth bucket, Pallet Forks, Bale Spear. Hydrualic top llin, QH, 48 RC, 60" tiller, Angle blade, Landscape rake, Carry-all, Post hole auger.

  3. #3
    Platinum Member spruce Deere's Avatar
    Join Date
    Feb 2009
    Posts
    706
    Location
    Northmost Idaho
    Tractor
    John Deere 790 w/ 300 loader

    Default Re: leaky 790 water pump, not even 500 hrs yet

    Well, looked into that and according to deere, there is no kit for the pump according to the engine no. '3tnv82A-LJNT'. There is kits for other earlier 3TNV engines they use but not this one.

    Got a hold of hoye tractor. They have a pump that looks pernt' near identical to mine, they could not tell me if it would work on my model or not..... For just less than half of what deere wants.

    E-bay for parts makes me a little Leary on stuffs like this, lot of unknowns. I ordered from deere cause parts will fit, and work and if it don't work, or fit I have a dealer locally to deal with. No phone tag, emails and such.

    Just figgers, warranty ran out less that a year ago..........
    790 JD W/ 300 loader
    Lots of implements for loader and 3pt
    Can't do it burn'n diesel, is not worth do'n

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