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Posted by Tom G on May 26, 2008, 1:23 pm
> George Abbot wrote:
> ...
>> old craftsman 20hp 42" model 917.27682.
> ...
>> ... other is low on one blade tip and high on the other. ...
>>
>> If the blade is removed and replaced about 180, the low/high reverses.
>>
>> If the blades are swapped, the low/high is still about the same on the
>> same mandrel.
> ...
>
> The last two statements are contradictory -- if the high/low position
> interchanges when the blade is rotated 180 degrees on the spindle, that
> would indicate a bent blade as any tilt or bend in the shaft would be the
> same and the location of the low spot moved w/ the blade.
>
> OTOH, if swapping blades doesn't change the symptoms, the blade isn't bent
> (or the even more unlikely that they're both bent exactly the same way).
>
>> Unfortunately, the machine did not come with a IPB of the mower deck,
>> only the tractor, so I cannot figure out just what is involved in the
>> pulley/blade drive assembly.
>
> There would likely be a parts diagram on the Sears web site for the deck
> as well I would think...
>
> First check to see if the shaft of the offending spindle is bent. If you
> have a dial indicator, that's the most direct way, but you can improvise
> w/ any tool you can position at the side of the shaft where the blade
> mounts and rotate it slowly to see if the distance between the shaft and
> the tool point changes. If it does, that indicates the shaft is bent
> which would provide the symptoms (other than the dichotomy noted above).
> It would have to be replace as it will be treated.
>
> It is also possible the deck where the mandrel mounts got bent if hit
> something or that there's a combination of both bent spindle and deck. It
> would seem unlikely the mounting itself would be able to cause a camber as
> the castings are likely just bolted directly to the deck so a movement
> there would simply be lateral, not angular--but, that would need a picture
> to see clearly.
>
> I'm guess the most likely is the shaft is bent...
>
> --
On a lot of brands, you can just press out the shaft and replace that but on
my Craftsman, I found that the pulley is welded to the shaft so Sears gets
to sell you a complete mandrel assembly...in my case it was about $70.
Tom G.
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