John Deere JX75 belt problem

Discussion in 'Mechanic and Repair' started by jerseydevil, Sep 15, 2007.

  1. jerseydevil

    jerseydevil LawnSite Member
    Posts: 13

    I have an older JX75 that I have replaced the drive belt for the transmission on twice now and it keeps getting thrown/chewed off the spindle. My question is could the drive gear be out of tolerance or am I missing some kind of guard/tensioner? The drive cable is brand new also. The mower itself is about 10 yrs old. Has any one experienced this similar problem before???????:confused:Any suggestions would be greatly appreciated. :drinkup:
     
  2. khouse

    khouse LawnSite Bronze Member
    Posts: 1,465

    Are the belts from JD? If not you may be buying a simular belt but not the exact one. I don't buy OEM belts much but I have found especially on JD mule drives the OEM belts stay on.
     
  3. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Posts: 3,712

    make shure the tabs on the belt gaurd at the trans end are not bent out . you can bend them in so they keep the belt closer to the trans pully and the belt cant jump off then
     
  4. jerseydevil

    jerseydevil LawnSite Member
    Posts: 13

    I usually get the exact replacement belts from JD. I double checked the tabs on the driven pulley and the tab on the right was bent out quite a bit. That seems to have done the trick. Thanks for the tip Dan. Looks like I'm gonna have to replace the BBC any way next spring. The pad on top is worn down next to nothing. Si I might as well replace the belt whilee the rest of the gear is off.:drinkup:
     
  5. jerseydevil

    jerseydevil LawnSite Member
    Posts: 13

    Well the driven pulley tightening up didn't do it. The belt keeps slipping off from the drive pulleyand getting chewed up. So I guess I'm gonna have to replace the BBC (clutch) before spring time after all? I don't think that pulleys wear out much?Since I don't feel like raking leaves, I'll be putting the BBC on during the rainy periods today.:hammerhead:
     
  6. jerseydevil

    jerseydevil LawnSite Member
    Posts: 13

    Well the new belt and BBC (clutch) didn't fix the problem either?:confused: I did notice that the cable for the clutch control is adjusted all the way up too? The last two things left is the drive and the driven (transmission) pulley. That'll be everything under the deck to make it go with the exception of the transmission itself! Really starting to try the ol patients!:hammerhead: :dizzy: Any suggestions are greatly appreciated.
     
  7. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    I haven't posted because I have never seen one of these units up close (none in my area).

    But, After looking at the parts break-down and my new Deere service manual the only possible reason I see for the belt coming off is as dan stated with the belt guides. I don't believe replacing pulleys will get you anywhere.

    Make sure the engine pulley guides are no further than 1/8" from the back of the belt while engaged. Also check the trans. pulley guides for the same spec. to make sure they haven't been bent away at some point in time for a belt replacement, The trans. pulley should be removed when replacing this belt.

    [​IMG]


    Good Luck
     
  8. jerseydevil

    jerseydevil LawnSite Member
    Posts: 13

    Thanks for the replyRob. I'll check the distance on the belt guides. There is only one bracket underneath where the drive pulley is situated and there is only one way they can go on. I didn't notice any other belt guides up near the drive pulley. Also, if you look at the picture you posted see the cable on the side with the jam nuts? The distance on the threads is about half way which it should be. My cable is adjusted all the way down to keep the tension on the trans pulley???????????? I'll try the belt guides and let ya know.
     
  9. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    I don't have the serial number off your unit but there are only two number breaks and both show that there is supposed to be a double fingered belt guide at the engine crankshaft pulley as below.


    [​IMG]

    If you can figure out this guide problem you may be able to adjust the engagement cable properly.
     
  10. jerseydevil

    jerseydevil LawnSite Member
    Posts: 13

    rob

    My JA62 has that type of guide but I don't think that the JX75 ever had that one? There is a plate that bolts up with the clutch plate bolt that has the two flat tabs on the side? I'll try and adjust the ones there?
     

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