How not to change your mower blades

   / How not to change your mower blades #1  

joshuabardwell

Elite Member
Joined
May 6, 2012
Messages
2,728
Location
Knoxville, TN
Tractor
Bobcat CT225
Literally within hours of putting a new set of blades on my mower, I ran over a root in an area I have mowed a hundred times, and for some reason, this time I hung up a blade. Normally, when I hit something, the blade nicks and I cuss and go on, but this time, the brand new blade was totally ruined. Like, bent forty-five degrees and digging into the dirt. Brutal. I drove back up to the barn. I really didn't want to pull the deck back out from under the mower again so soon, so I just tipped the mower over onto its side, pulled off the blade, and set the mower back on its wheels.

Now, I knew that turning the mower on its side would jumble things up a little, but I was kind of mad, and the mower was due for an oil change anyway, so I figured what's the worst that could happen? The next day, a fresh set of blades was installed, the oil was changed, a new air filter was on, and I was ready to go.

Not quite. The old air filter was covered with oil and fuel where (apparently) the oil leaked out the air intake when I set the mower on its side. The muffler had also leaked a watery oil/fuel mixture. The presence of fuel is most likely explained by the fact that, two years ago, ethanol ate my carburetor, and now it leaks fuel slowly into the oil if I don't use the cutoff valve that I installed in my fuel line. Every time I'm done mowing, I cutoff the fuel and let the carb run dry. But maybe there were a few times when I turned off the mower for a few minutes without running the carb dry and leaked some fuel into the oil. Anyway...

The mower wouldn't start. Ugh. The next thing I did was pull the new air filter. No dice. Clean the plug. No dice. Check spark. Good to go. Shot of starting fluid. Engine fires up but won't run. After a few bursts of starting fluid, I noticed additional oily fluid coming from the muffler, so I thought the muffler might be clogged up and I pulled it. Finally, the engine ran, emitting clouds of white smoke. I killed it and reinstalled the muffler, then fired it up again. Again, it ran, but the muffler was smoking--my best guess is oily mess burning off. I grabbed a fire extinguisher and continued to observe.

After a while, the smoke had all stopped and everything seemed to be going okay, so I took the mower out to finish mowing that field. After about ten minutes, though, the mower started surging, losing power, and trying to stall. I limped it back to the barn where it finally stalled out.

Oh, by the way, in all the cranking with the starting fluid and such, the solenoid, which had kind of been trying to die, finally gave up the ghost. So now I'm cranking by putting a jump-start battery pack on the starter lug and hitting it with 12 volts.

Now, I noticed that the muffler had a white substance caked on its grille, where before it was black. I thought maybe the oily film had cooked off and left some kind of residue in the motor, so I pulled the plug and cleaned it again. Where before it was wet and black, now it was dry and... well, still kind of black. So I brushed it off with some acetone and a wire brush. But even before I cleaned it, it was sparking away, so I don't know.

And that's where we stand, ladies and gentlemen. Tomorrow, when the engine has cooled off and it's light again, I'll give it another go. Hopefully, the loss of power and stalling had something to do with a fouled plug from something cooking on, and everything will be okay. If not, then I have no idea where to go from here.

Anyway, the moral of the story: just pull the dang deck when you need to change your blades. No matter how frustrated you are, tipping the mower on its side will just make more trouble.
 
   / How not to change your mower blades #2  
Wow....tough day.....hope tomorrow is better!
 
   / How not to change your mower blades
  • Thread Starter
#3  
Oh, I forgot to mention: while I was spraying starting fluid in the air intake (with the filter off), the motor backfired and lit the remnants of the oily mess on the air intake housing on fire! I quickly blew out the fire and no harm was done. That was when I went and got the fire extinguisher, and also pushed the mower further from the barn.
 
   / How not to change your mower blades
  • Thread Starter
#4  
Wow....tough day.....hope tomorrow is better!

Thanks! Fingers crossed. I really don't see how any permanent harm could have been done, but the amount of hassle this has been, I really wish I had just pulled the deck in the first place. I was just so mad about the blade breaking!
 
   / How not to change your mower blades #5  
Ugghh... that made for a long day. I'm sure all will be fine once you get it up and running again. I remember when I was in school working a summer job for a rent a tool shop. I had a walk behind mower on it's side cleaning the deck. The boss came out and said "change the air filter when you get done... you just ruined that one." I had the carburetor facing down. Needless to say from that point on when I've needed to lean something over.... I kept the carb facing up.
 
   / How not to change your mower blades #6  
I use regular car ramps to change blades.... :thumbsup:
 
   / How not to change your mower blades #7  
Did you check the oil level?

The backfire may have damaged some of the valve train components???:)
 
   / How not to change your mower blades #8  
Well I guess you are confirming my choice on my B2710 mower: I've never changed or sharpened the blades in the 13 years I've had it!
 
   / How not to change your mower blades
  • Thread Starter
#9  
I use regular car ramps to change blades.... :thumbsup:

I've considered this, but I'm not sure I could turn the bolt loose from under there, since I don't have an impact wrench to spin it off with.
 
   / How not to change your mower blades
  • Thread Starter
#10  
Well I guess you are confirming my choice on my B2710 mower: I've never changed or sharpened the blades in the 13 years I've had it!

I think you're due! I don't know what you mow, but I'm guessing your blades are beat to heck!
 

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