Craftsman 900.370520 - Manual (Page 13)

TO REMOVE BLADE
• Release Operator Presence Control
Switch to turn mower off, wait for the
blade to stop, and remove safety key.
• Cut a two foot length of 2x4 wood and
use it to keep blade from turning while
removing blade nut.
• Wear gloves, position wood, and loosen
nut counterclockwise as shown. Remove
nut.
• Remove square steel washer, plastic
insulator washer and blade.
TO REPLACE BLADE
• Place blade on shaft so that the blade
edges are parallel with the flat sides of
the shaft. Make sure you place the blade
so that its cutting edges will face the
ground when the mower is running.
• Place plastic insulator washer on shaft
so that two of the washer’s raised edges
fit over the edges of the blade.
• Place square steel washer on shaft so
that flat sides of hole in washer are par­
allel with flat sides of shaft.
• Place blade nut on shaft. Make sure all
parts stay aligned. Position wood to keep
shaft from turning. Securely tighten blade
nut clockwise to 20-30 ft. lbs.
TO SHARPEN BLADE
• Keep blade sharp for best mower perfor­
mance. A dull blade does not cut grass
evenly.
* Wear proper eye protection.
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