walker mower headaches

Discussion in 'Mechanic and Repair' started by jrwatts, Aug 17, 2006.

  1. jrwatts

    jrwatts LawnSite Member
    Messages: 3

    I have a walker mower, MODEL MT 20HP MOTOR. I just recently had starter trouble with it, took the starter off rebuilt it, and put it back on well finally got the thing cranking again.. I bought this mower cheap and am trying to get it going again. Well I let is sit for a few months, when i went back to it, it would not run again, when you hook up the negative battery cable, the starter spins but does not turn the motor over, it is like it is shorting out somewhere, but i am unable to find it. It sparks at the cable and the starter spins but no motor spin. Does any one have any ideas on this? Would appreciate any help.
    Thank you...
  2. Jim@MilkyWay

    Jim@MilkyWay LawnSite Senior Member
    Messages: 472

    Excuse me?
  3. jrwatts

    jrwatts LawnSite Member
    Messages: 3

    sparks at the negative battery cable when you hook it up and the starter spins but does not engage......
  4. Jim@MilkyWay

    Jim@MilkyWay LawnSite Senior Member
    Messages: 472

    Start with the spark.
    You should not draw any current, viz get no spark by simply connecting your ground cable.
    Start isolating circuits till you find out what is shorting. To do this, leave the ground cable off the battery, then pull fuses, disconnect wires, all one at a time, and what ever else it takes till you do not get any spark by act of simply connecting ground cable.
    'Course I suppose I may be in error, but not likely. Tell me guys, would this machine have a circuit of _ANY_ kind that pulls juice with no switch in "on" position?
  5. AAELI

    AAELI LawnSite Senior Member
    Messages: 360

    NO circuit pulling juice with switch in off postition. Look for shorts.

    Just had one last week come in with battery off of another piece of equipment and found customer had hooked up the postive terminal on the battery to the ground cable and postive cable to the neg. terminal.... He said his starter did not work. Duh.
  6. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Believe it or not I have actually seen people take a dead battery and recharge it back-wards.

    If you take a gander at this; http://www.lawnsite.com/showthread.php?t=144040 and do as it says we can get a better idea of what you are working on.
  7. Jim@MilkyWay

    Jim@MilkyWay LawnSite Senior Member
    Messages: 472

    If you do in fact get even the slightest sparkle or audible crackle when you touch cable to battery post, which is the way I interpreted your replies, then the battery is sustaining a leakage current, and will die in short order if you leave it connected. Remember, the batteries of the type used on lawn equipment do not have a lot of power reserve.
    A car has things like radio memory, clocks, burglar alarms and who knows what else, that do in fact draw 600ma DC, give or take, when your car is sitting there waiting on you to crank and run it for a while. With a healthy, large energy reserve device it won't even feel it for a month or so, much less over night.
    P=IR equates to: 0.6A X 12V = 7.2W
    That ain't a whole lot of power consumption when you consider that 600A X 12V = 7.2KW to start a cold car engine; or did I miss a decimal in there somewhere.
    Are you with me?
  8. tomo

    tomo LawnSite Senior Member
    Messages: 660

    hello, is there pwr at the siginal wire to solenoid when earth cable is connected to batt. Disconnect siginal wire and check 4 pwr when neg cable is connected. [correct polarity of batt and cables????????] Ignition switch could be faulty.If all electrics r ok bendix one way bearing may be faulty[same symtoms as u mentioned]
    TOMO ps in a neighbouring workshop they did have a bad batch of batteries ,polarity was around wrong way .As they were ambulances batt company paid 4 all loom/ electrical repairs etc
  9. mcambrose

    mcambrose LawnSite Senior Member
    Messages: 518

    I have had major problems with Walker starters. If you find the battery is good. buy a new new start off ebay.
  10. lucforce

    lucforce LawnSite Member
    Messages: 223

    "when you hook up the negative battery cable, the starter spins but does not turn the motor over,"

    jr, if you make it back to the site, the above statment tells us that you have some wiring issues, and possibly some starter issues.

    Please, do as rob has asked and we ill be able to help you better.

    For anyone that ever searches and finds this thread: Kohler starters are prone to a similar failure rate as other manufacturers. The thing that kills these starters is not (always) their design. Improper cables, connections, and battery sizes and overcranking are the leading causes of "failure," or put more carefully, destruction.

Share This Page