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John deere 12sb stiff shifting transmission

Discussion in 'Mechanic and Repair' started by lovemysan, Aug 28, 2009.

  1. lovemysan

    lovemysan LawnSite Member
    Posts: 16

    I've been trying to get my 12sb repaired. It runs excellent but the trans would not shift into 5th. 4th was difficult also. I tried adjusting the cable and that allowed me to shift 2-5 with 5th being nearly impossible.

    I removed the trans and disassembled it. I discovered some some moisture had gotten into the grease. There is no rust or obvious damage.

    There are a few reasons the shifting is too stiff

    1) the shift collar doesn't slide freely on the holder. The holder is plastic, do these swell?

    2) The shift keys pass through a washer separating each gear, I suppose this gives positive engagement. 1-3 has a nice easy click 4-5 are stiff. I tried polishing the shift key but it didn't seem to help. Any ideas?

    3) what grease goes into this transmission?

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