Mowing Breaking BX Blade Bolts

logdog · Aug 15, 2013

I removed the other two bolts and they looked fine. I cleaned out each hole with brake cleaner in case their had been lube installed previously. The part number for the bolt has been updated but I didnt think to ask when. I have used the mower about 2-3 hours but will wait to call it a success because it usually takes awhile. I may pull the deck off after another few hours just to inspect.

logdog · Aug 15, 2013

94BULLITT said:
Even though you have a Snap on torque wrench check it with another know good Snap on torque wrench to be sure it is accurate.

What are you torquing them too?

72-87 is the spec. Ive been doing 75 but this last time I did 72.

logdog · Aug 15, 2013

craigbaill said:
Ok...it may be a longshot buuuut. Did they give you YOUR blades back??? It has been known to happen that blades, chains, etc get mixed up. It would explain why all the bolts keep breaking. Maybe?

Dont know. I was in Kansas when it went down.

Coarsegold Bob · Sep 17, 2013

Hi,

I just came across this thread and thought that my 2 cents might help.................

The purpose of the bolt is to apply clamping force between the blade and the spindle which causes the friction that drives the blades...

If the blade is distorted and doesn't have 100% contact between the blade and the spindle the blade will not be driven by the by the total area of the spindle and the blade could slip causing the bolt to over over-torque and break......

Take a straight edge and use a feeler gauge to check if the spindle and the area on the blade that contacts the spindle are flat.......

There should be no lube between the spindle face and the blade because this will allow the blade to slip...

An example is the wheel on your car or tractor..If the bolts are under torqued or there is lube between the hub and wheel, the wheel will want not be driven by the hub but rather by the wheel studs and they will fail.....

I drag race and the best way to have your rear wheel come of is to under torque the rear wheel studs?

Just something to check because it might fix the problem

Good luck,
Bob