My guess is that one mandrel assembly is out of alignment on my one year old
craftsman 20hp 42" model 917.27682.
It was scalping the lawn when going over bumps at low heights. I thought it was
a bent blade but did the same
with a new blade.
I removed the deck and did some tests. One blade is at the same depth when
rotated 360 (so works fine) while the
other is low on one blade tip and high on the other. It is slightly beyond the
edge of the bottom of the deck,
so obviously will scalp the lawn if the deck bottoms out.
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
I noticed that there are four bolts around the pulley/blade drive assembly and
wonder if the alignment can be
I know I can probably shim it at the blade to get it into alignment, but is
there another fix?
Or is it beyond repair? I am reluctant to replace the pulley assembly in case
the deck itself has an alignment
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.
Any help appreciated.
- posted 12 years ago