Sears Craftsman Lawn Tractor Stator Problem. Please Help.

Discussion in 'Mechanic and Repair' started by anvil, Mar 14, 2007.

  1. anvil

    anvil LawnSite Member
    Posts: 11

    In my quest to fix an electrical problem that I am
    currently having with my mower, I posted outlining
    my problem last week and was answered by a couple
    of very helpful individuals.

    I still however have been unable to arrive at the cause.

    The point that I am now at is with the stator.

    As I'm sure you know, the stator has 18 poles.

    If you are standing over the stator, looking down, with the two
    unwound poles at the 12 o'clock position, the first five poles
    (clockwise) get hot when the key is turned to the right in either
    of the two positions before start.

    The remaining poles remain cool.

    The wires that I repaired also begin to heat up.

    Would this indicate a bad stator or a problem else where?

    I would greatly appreciate it if anyone could take a moment
    to get up to speed with my dilemma at

    http://www.lawnsite.com/showthread.php?t=177607

    Please feel free to provide any suggestions that you feel
    would apply.

    Any further insight is greatly appreciated.

    Mark
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    Sorry Mark, Didn't mean to leave you hanging got called out of town.

    Post me the model number off the white label (maybe under the seat) off the tractor. I would like to pull up the wire diagram.
     
  3. anvil

    anvil LawnSite Member
    Posts: 11

    Hi Restrorob,

    No problem. I'm just happy to have a couple of guys
    willing to take the time to help out with my problem.

    I was downsized out of my job last year and am trying
    to keep from the expense of hauling the thing to the
    local repair shop.

    I went to the parts dept at the local Sears to try to gain
    more insight into the yellow and black wires from the
    harness that tie in with the black wire from the stator
    in a “Y” configuration (the location where I attempted
    to solder it back together) but was not able to find out
    anything.

    From what I have read, there may be an inline diode
    where the wire came loose and it should not be resoldered
    without replacing the diode but I am not sure if that applies
    to my mower.

    There appears to be a tiny piece (1/8 inch) of hard wire at
    the “Y” but the yellow wire came loose just before it.

    Also, I tried a continuity check between all of the stator leads
    (lead to lead) and all of them read 0.3 - 0.5

    Ok, the Craftsman M.N. is: 917.259556

    Thanks Again for the help.

    Mark
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    OK Mark, The place you repaired the wires; Was it on a short pigtail going between the main tractor harness and the stator as below or between the stator and the plug connector ?


    [​IMG]

    I really don't believe all three wires should be tied together as seen in the engine wire diagram I posted before. The hard wire you speak of is what's left of the diode. The diode is supposed to let voltage run in one direction only so not to back-feed voltage to the stator, Which is probably why the stator and wires are heating up when you turn the key on.
     
  5. anvil

    anvil LawnSite Member
    Posts: 11

    Restrorob,

    Sorry for the delay, but I wanted to take a picture of the wiring
    to hopefully help you gain more insight into what was what.

    The BLACK wire (just above the GREEN one in the pic) goes to the
    stator. he end pictured is supposed to be attached to the end
    of what appears to be the small piece of hard wire that I
    previously referred to on the end of the YELLOW wire.

    For some reason, the picture looks considerably darker in the
    attachment than the actual photo. Please let me know if you
    need for me to try to lighten it up a bit.

    Thanks Again for your time.

    Mark

    Mower.JPG
     
  6. thecrankshaft

    thecrankshaft LawnSite Member
    Posts: 172

    Your stator has three wires coming off of it:

    Black - 12 volt, 3 amp DC charging wire that should be connected to battery positive

    Yellow - 70 watt AC voltage accessory wire for lighting

    Green - stator brake

    That should help you figure this out. Get it wired correctly and I think your overheating problems should end if the stator is ruined.
     
  7. anvil

    anvil LawnSite Member
    Posts: 11

    Thank You for your reply Crankshaft.

    The problem is that the first five poles on the stator started over
    heating AFTER the initial repair (in the photo) was made.

    The BLACK wire that leads to the stator has since come loose
    and needs to be resoldered.

    I'm wondering if doing so will be sufficient or if I should also go
    ahead and replace the stator.

    Thanks Again for the help.

    Mark
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    Remember this;

    Remember this;

    [​IMG]

    You notice in the diagram none of the three stator wires should be connected to each other.

    You have two choices, Buy a new stator and be done with it (which I see the plug connector in your pic.) or install a new diode and hope the stator is not burned up or shorted out.

    [​IMG]
     
  9. thecrankshaft

    thecrankshaft LawnSite Member
    Posts: 172

    Listen to Rob - I forgot about that diode in there. The stator actually produces AC voltage, but DC is needed for charging, that is why the diode is there. It may be causing the problems of overheating like stated.

    Diode 2575531-S List $9
    Stator 1208508-S List $40

    Get those wires off of each other!
     
  10. thecrankshaft

    thecrankshaft LawnSite Member
    Posts: 172

    Why can't I edit my post?
     

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