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Deere 862 Transmission. Wont Move

Discussion in 'Scrapers' started by DozerTech78, May 14, 2020.

  1. DozerTech78

    DozerTech78 Member

    Joined:
    Jan 18, 2017
    Messages:
    21
    Occupation:
    Heavy Equipment Tech
    Location:
    Indiana
    Working on a John Deere 862, Went down on a job and wouldnt move. Checked basic things, parking brake is released, trans is full of oil. Engine runs fine. I didnt have many tools with me at the time so I did what I could to try to isolate the issue. Im familliar with the electronic shift controller which was my main suspect at first but after starting and trying to get the machine to move, i realized I can put it in gear and hear/feel a thump in the trans like clutches are engaging. The trans output shaft will move slightly but no matter how much throttle i give it, it wont move. Id like to tap into the clutch ports to see what pressures its getting just to see what direction to go from there, I can grab the output shaft and wiggle it and watch the input shaft turn with it. The trans input shaft spins the entire time the engine is running and when i try to put it in gear so I would assume the TC is not slipping. I know its no a lot to go off of until I check pressures but just didnt know if anyone here has experienced similar issues?
     
  2. tdrainage

    tdrainage Well-Known Member

    Joined:
    Feb 23, 2013
    Messages:
    65
    Location:
    paris, IL
    Is it an"A" model? 862A... If so it may be like our 762A that is a large useless piece of iron still. There is a black box behind the seat which is the like an ECM or brain box - as you move the shifter through the gear selector it sends signals to a bank of magnets on top of the transmission that directs which solenoids open and shut for the gear selected. If that box isn't working then the transmission won't get the correct electric impulses to engage the correct gears and the machine will not move.
    We have sent ours off to 2 different outfits that claimed to be able to repair it - we even sent to schematics for the machine and they were not able to help. There is no help of any kind from mother deere either. Obsolete machines in their book. We are still trying to find someone to build something that will work. They are good machines but as of right now we have a parts machine available.
     
  3. DozerTech78

    DozerTech78 Member

    Joined:
    Jan 18, 2017
    Messages:
    21
    Occupation:
    Heavy Equipment Tech
    Location:
    Indiana
    Thanks for the reply. Its just a plain 862 with no designation. It has electrohydraulic controls for the bowl, like “rocker switches” on the right side console, if that tells you anything. All i have is a parts book for the machine, no service manual. I wanted to remove the top cover off to get a look inside but i didnt have anything to reseal it. Im not sure what the strategy is for shifts. I might go back out and pull that cover off and see if I can check voltages for each coil in each gear
     
  4. mg2361

    mg2361 Senior Member

    Joined:
    Jul 5, 2016
    Messages:
    1,565
    Occupation:
    Equipment Mechanic/Technician
    Location:
    Pennsylvania
    Did you check fuses? Might want to acquire a tech manual. TM1212 for an 862.
     
  5. tdrainage

    tdrainage Well-Known Member

    Joined:
    Feb 23, 2013
    Messages:
    65
    Location:
    paris, IL
    You need the tech manual to check voltage in the coils. It is not as simple as energizing one coil for s particular gear. At least on the 762 it is a sequence of 6 different magnets energized uss sad omg anywhere from 2-4 different ones for each gear. I can post a pick of ours tomorrow if you want to give you an idea. Don’t know if 762 and 862 are close in any way but would give you an idea of what is supposed to happen when each gear is selected
     
    DozerTech78 likes this.
  6. dozr

    dozr Well-Known Member

    Joined:
    Dec 15, 2013
    Messages:
    203
    Occupation:
    excaving
    Location:
    alabama
    my 762 has a clark trann all manual and works good just real high to work on.
     
  7. tdrainage

    tdrainage Well-Known Member

    Joined:
    Feb 23, 2013
    Messages:
    65
    Location:
    paris, IL
    Yes a straight 762 does have a manual transmission. We have a 762 and a 762A. Unfortunately you cannot mate the older tranny to the newer machine. We have researched that and Deere made too many changes to make this happen