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Gear Boxes

Discussion in 'Mechanic and Repair' started by rballardvt, Jun 12, 2001.

  1. rballardvt

    rballardvt LawnSite Member
    from Vermont
    Messages: 3

    I'm having a problem with the gear box on my 60" deck blowing out. I have a JDf915 with a diesel engine and I have to replace the gear box on the mower. This is the second gear box (@$300!!!) I've replaced since I've had it 11 years (the other was replace only 2-3 years ago. Is there something that can cause them to go bad fast?

  2. sdwally

    sdwally LawnSite Senior Member
    Messages: 385

    Some ideas:
    Improper bearing preload on the input shaft, if a nut is used. Improper backlash on the gears, shims are used to adjust backlash. If leaking oil, lack of lubrication. If aftermarket seals were used in the rebuild, wrong type of seal used on output shaft. Most seals are not rated for the high rpm shafts that are under $6.00. We use seals that rated at 2000 rpm and costs about $9.00 from a bearing and seal vendor. Vent plug plugged, will cause oil to be forced out pass seals when hot.
    With out examining the parts, it just some ideas. Hope this helps.
  3. racerdave

    racerdave LawnSite Senior Member
    Messages: 260

    I agree with sdwally.
    I also run synthetic grease in the deck gearboxs.
  4. rballardvt

    rballardvt LawnSite Member
    from Vermont
    Messages: 3

    Are there good after market gear boxes that I could but on my John Deere f915 60 inch deck? as opposed to paying the $300 to John deere! (on top of that they sent me the wrong one)
  5. racerdave

    racerdave LawnSite Senior Member
    Messages: 260

    try the yellow pages under power transmission.
  6. staples

    staples LawnSite Member
    Messages: 4

    i hate the gear boxes, the 1145's actually have a blade straight to the spindle straight to the gear box.... what idiot did that?.....i have replaced gear boxes several times........it pisses me off it what it does........goog luck.....

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