Bunton Transmission Leak

Discussion in 'Mechanic and Repair' started by garyt, Mar 25, 2007.

  1. garyt

    garyt LawnSite Member
    Posts: 28

    I have a an older model Bunton walk behind that has a transmission leak out the right side. I'm attaching a pic to help show what I have. I'm hoping you guys can help me with the following:

    1. What type of oil to fill with?
    2. How much do I put in it?
    3. Is the small top screw the fill plug?
    4. How difficult would it be to fix the leak?

    Thanks in advance.


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    DSC00776.JPG
     
  2. mini14

    mini14 LawnSite Member
    Posts: 236

    have had a few buntons over the years, the small top screw is the vent, probably pluged cauz its leaking out the side....i still use a 48 bunton walkbehind with a 2 wheel velke..5 years ago i replaced the old gear oil with mobil shc 634 synthetic gear oil, it has never overheated, smoked or leaked.all my other buntons did before i got rid of them or they died...one time i put the mobil in an oveheated 36" gear box that striped most of the brass and it went another year before its engine blew after 15 years....u do have a small leak out the side, and u can reseal it but u will have to tear the box apart to do it....since learning about the mobil shc 634 thats all i use in a gear box, I wouldn't fix that leak, its small and will probably stop if u put the mobil in it...ive allways pulled the 4 top screwss to fill. the side plug is for draining and when u refill the box fill it to the top of the drain plug only, gear oil expands big time. u can get the mobil here http://www.grainger.com/Grainger/wwg/itemDetailsRender.shtml?ItemId=1611715718 its a little pricey, but u wont have to change it for at least 10 years.
     
  3. Runner

    Runner LawnSite Fanatic
    Posts: 13,496

    Yes, make sure it is not getting overfilled, first of all. It has to be filled by the side plug - not the top (just in case it was). There are seal kits for these, and they really aren't that difficult to do. I had a couple of these mowers (JD). The idea of the synthetic is good, too.
     
  4. garyt

    garyt LawnSite Member
    Posts: 28

  5. garyt

    garyt LawnSite Member
    Posts: 28

  6. mini14

    mini14 LawnSite Member
    Posts: 236

    just order it from grainger, call them up : Synthetic Gear Oil, SAE Grade 140, ISO Viscosity Grade 460, Viscosity Index 159, Viscosity SUS @ 100 Degrees Fahrenheit 2236, Flash Point 460 Degrees Fahrenheit, Pour Point -20 Degrees Fahrenheit, Container Size 1 Quarts, 634 Formula Grainger Item # 4ZF30

    If u google it u might find it easier....this is single weight oil and it works...was told to use it years ago from mower mechanic,do yerself a favor and fill it from the top cauz filling it from the side plug will take u forever..just dont fill it past the bottom of the side plug
     

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