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Husqvarna Genuine Part Spindle Assembly 966956101

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Husqvarna Genuine Part Spindle Assembly 966956101

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Product Review (submitted on November 4, 2016):
The parts manual suggests that all three spindles and pulleys are identical. However, this spindle/pulley apparently supersedes the original part number(s). I bought the machine used and the original spindle/pulley had already been replaced with this style. After about 300 hours, that (spindle/pulley) also failed and I replaced it (with this part number) which also failed in about 350 hours of use. Cause in both cases was the loosening of the pulley retaining nut on the upper end of the spindle. The nut is regular RH thread and, apparently, a blow to the blade by hitting a root or other substantial object can loosen the nut, resulting in irreparable damage to the spindle shaft and pulley splines. The original spindles have a bolt threaded into the shaft instead of exterior threads and a nut on the end of the shaft.as found on this replacement. I would note that I often verified that the nut was still snug at its required 45 ft/lb torque. There is no lock washer, jam nut or self-locking nut to prevent loosening. There appears to be a lock washer on the retaining bolt of the original spindle arrangement.

The parts are easy to install and they run true and smoothly. The question is: How long before this assembly fails again?
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