Pulley Problem..help

Discussion in 'Mechanic and Repair' started by SlickTrick, Apr 7, 2008.

  1. SlickTrick

    SlickTrick LawnSite Member
    Posts: 5

    I have Vtwin 19.5 motor on my craftsman. The problem is with the pulley under the motor. The bolt that goes up into the pully towards the motor will not stay tight, like it's striped out. Bolt finally came out and pulley fell down. My question is how I go about fixing it? Surly there is a way to fix it.
     
  2. JimQ

    JimQ LawnSite Bronze Member
    Posts: 1,139

  3. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Take the pulley all the way off, Look down the center where the crank rides. You will most likely find the stamped key area worn causing it to move back and forth on the crankshaft. If this is the case there is no way I've seen/heard to keep this worn pulley tight other than replacement. Also check the crank key way slot for wear and your center bolt threads.
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    OK Slick, You pulled a Trick.....

    You were calling the PTO CLUTCH a pulley therefor on most units with a crank pulley it is referred to as a engine STACK pulley (two pulley's made together) so disregard my previous post.

    If your father in-law has a PTO clutch that looks just like yours with the same size pulley use it, If it isn't you will need another.

    Leave the drive (upper) pulley alone the threads are in the crank. But, Going over-sized instead of a heli-coil will not let you use the big thick flat washer that should be used to hold the clutch up.
     
  5. SlickTrick

    SlickTrick LawnSite Member
    Posts: 5

    They are not actually made together.The electric clutch sits on top of the pulley that runs the mower belt. Them 2 the clutch and mower pulley are made as one. Then the clutch and mower pulley which is togehter goes up agaisnt the the engine pulley that you call a crank pulley. So the bolt slides thru the clutch pulley into the crank the pulley. And I need to use the heli-coil.

    Sorry for all the misunderstanding and I'm Thankful for your time and Help.
     
  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    Dude, You have meee lost now. I know what parts you have on your unit and how they go on. Post the model number off this thing (which I should of asked for at first :hammerhead:) so I can try to explain. And yes a helicoil as Jim posted is the proper fix.
     
  7. SlickTrick

    SlickTrick LawnSite Member
    Posts: 5

  8. SlickTrick

    SlickTrick LawnSite Member
    Posts: 5

    By the way model number is 917.256660
     
  9. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    OK, Below is what you have by the proper names except the "Special" washer I called it because a few regular thin washers stacked together will not hold properly. You must have the thick washer.


    [​IMG]
     
  10. SlickTrick

    SlickTrick LawnSite Member
    Posts: 5

    I have the big flat washer. I just wonder what caused the bolt to strip out the threads in the crankshaft. Makes me think i might as well go ahead and change out the drive pulley also. What you think? Anyhow I'm not a small engine guy and don't trust myself rethreading the shaft, so I guess i'm going to take it to my buddys machine shop and let him or one of his guys handle that for me.
    I want to Thank You Restrorob and other great folks on here for helping me.
     

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