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WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
Sprockets
A sprocket should be replaced when the teeth be-
come asymmetric (when the front side of a tooth is a
different shape than the back side of the tooth).
NOTE: Generally; a small sprocket wears faster than a
large sprocket.
Sprocket Wear
Drive Shaft Sprocket Replacement
1. Remove the chain guard cover, auger guard, and
drive chain. Refer to REPLACING/REPAIRING of
Drive Chain in this section.
2. Loosen the set screw that fastens the sprocket to
the drive shaft.
3. Slide the sprocket off the drive shaft. Use a puller
if necessary.
4. If necessary, clean the end of the drive shaft with
an emery cloth or a wire brush.
5. Place the Woodruff key in the keyway on the drive
shaft.
6. Align the slot in the new sprocket with the Woodruff
key and slide the sprocket onto the drive shaft.
Make sure the Woodruff key is in place between
the driveshaft and sprocket.
Remove and Replace Sprocket
7. Position the sprocket on the drive shaft so it is
aligned with the auger sprocket. To check align-
ment, look at the drive shaft sprocket, over the top
of the auger sprocket, from the front of the snow-
blower.
Align Sprockets
8. When the sprockets are aligned properly, tighten
the set screw in the drive shaft sprocket.
9. Reinstall and adjust the drive chain by reversing
the removal procedures. Refer to ADJUST-
MENTS of Drive Chain Tension in this section.
Symmetric (Acceptable)
Asymmetric (Replace)
Woodruff Key
Drive
Shaft
Sprocket
Set Screw
Improper
Alignment
Proper
Alignment
Drive Shaft Sprocket
Auger Sprocket
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