20,000 Posts & Climbing
Join Date: Jun 2009
Location: Sault Ste Marie, Ontario
Re: Hit A stump
You probably bent the spindle that the blade is bolted to and the blade now wobbles up and down as it rotates. The eyes alone are not enough to judge a wobble when looking down on a rotating blade.
Flip the deck upside down and tape a laser pointer to the outer end of the blade and observe the dot on the inside of the deck walls as the blade rotates. It should be a consistent distance from the bottom of the deck all the way around. Variation means that the deck that the spindle housing is bolted to is bent (no vibration), or the spindle itself is bent (vibration).
As proof, flip the deck back right side up and lay a straight edge across the two spindle pulleys.
- If the deck is bent, any gap under the straight edge should be consistent in the same position on the straight edge as the blade is rotated a full 360°.
- If the spindle is bent, the position of the gap will move from one edge of the pulley to the other and back as the blade is rotated 360°.
- If the gap varies during rotation, but one edge of the pulley is constantly touching the same spot on the straight edge, both problems are involved.
- Buy a new spindle and housing complete if the spindle is bent.
- Shim between the deck and the housing to compensate for a bent deck.
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Last edited by TUDOR; 10-16-2019 at 07:39 PM.