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Old 11-10-2009, 12:44 AM
kenwin30 kenwin30 is online now
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mower vibrating with new blades....

hey guys, bought a 48" quest bout 2 months ago, and today i go to my dealer and bought the exmark wavy mulching blades, put them on tonight and the mower was vibrating like crazy, what could be causing this ?
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Old 11-10-2009, 01:08 AM
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unkownfl unkownfl is offline
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Are the blades timed on that machine? Are the blades torque correctly?
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Old 11-10-2009, 01:10 AM
DJ'sLawnCareSvc DJ'sLawnCareSvc is offline
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i found that if i didnt hit the bolts on my john deere with an impact gun a few good times they would vibrate the whole deck, either that or you have a blade thats off balance
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Old 11-10-2009, 02:13 AM
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LouisianaLawnboy LouisianaLawnboy is offline
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Blades upside down. Wrong size. Balanced wrong(shouldn't happen on new blades). Put the bolt in the wrong hole.
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Old 11-10-2009, 06:44 AM
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Nosmo Nosmo is offline
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The first thing I would now do is -- pull the blades off and check them for balance. Then if they are in balance put them back on and see how the mower feels when running now.

If you still have a vibration it has to be another problem. You might put your other blades back on to see if there is still a vibration.
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Old 11-10-2009, 07:47 AM
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lotsagrass lotsagrass is offline
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Checking blade balance: http://www.youtube.com/user/ExmarkMa...15/8lUcW9W_1hw
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Old 11-10-2009, 12:06 PM
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brucec32 brucec32 is offline
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Put the old blades back on. If the vibration stops it's the blades. If not, you may have a chunk missing from a deck belt.

If it doesn't stop and it's the blades, it might be that you have the wrong size blade hole, (exmark uses two sizes due to bigger spindles on newer mowers) . Does the blade fit through without any 'slack' in the hole? If it rattles around on the bolt you have the wrong blade.

There should be a stamped number on the blades of an OEM exmark blade. Check it vs the part number shown in your manual or on the exmark website parts lookup (I think they have one, toro does).

It isn't that uncommon to have them order a 48" blade for one model that doesn't fit another 48" deck, for example. That is the likely problem.
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Old 11-10-2009, 12:24 PM
fsung fsung is offline
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Quote:
Originally Posted by brucec32 View Post
Put the old blades back on. If the vibration stops it's the blades. If not, you may have a chunk missing from a deck belt.

If it doesn't stop and it's the blades, it might be that you have the wrong size blade hole, (exmark uses two sizes due to bigger spindles on newer mowers) . Does the blade fit through without any 'slack' in the hole? If it rattles around on the bolt you have the wrong blade.

There should be a stamped number on the blades of an OEM exmark blade. Check it vs the part number shown in your manual or on the exmark website parts lookup (I think they have one, toro does).

It isn't that uncommon to have them order a 48" blade for one model that doesn't fit another 48" deck, for example. That is the likely problem.
That's a really good advise. The older exmark has 5/8" center hole, while the newer one has 15/16".

Also, check if you put the washer in the right place. The spring washer should be between the bushing and the bolt. Also, the cone of the washer should be towards the bolt head.
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Old 11-10-2009, 07:18 PM
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Two Seasons Two Seasons is offline
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75% of the blades I bought recently were not balanced correctly, nor was the 30 degree set right!
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