Regarding : a craftsman weed trimmer 22 inch?

why does the string head keep going up when we are trimming weeds.

Don
August 2010

TO REMOVE/REPLACE TRIMMER HEAD
DRIVE BELT
1. Remove screw at front of chassis
cove r.
2. Lift cover up and away from trimmer.
3. Remove the two (2) screws on sides of
trimmer securing the debris shield.
4. Turn trimmer on its side with carburetor
and fuel cap up.
5. Remove the two (2) screws on underside
of trimmer securing the debris
shield.
6. Slide the debris shield rearward and
remove.
7. Remove belt from engine pulley on
crankshaft.
8. Remove belt from trimmer head pulley.

See http://disruptit.com/manualgateway.cfm?pdfwanting=44465&username=anon&AV=123345&I=98.166.246.184 for illustration.

emily
July 2009