Husqvarna TC 450 Workshop Manual page 234

FRONT SUSPENSION
Remove the stop ring using a slotted screwdriver.
Remove the inner tube from the outer tube.
N.B.: to make this operation easier, push the tubes back and forth several times
quickly (but carefully) until they separate.
Remove the seal rings and the metallic rings mounted on the inner tube.
Do not re-use any metallic parts which are disassembled.
Replace with new parts.
Replace any damaged seal rings.
The washer and the stop ring can be re-used, if not damaged.
Check that the inner push rod is not distorted or damaged.
Replace if necessary.
Check the bottom valve unit.
Replace any damaged O-rings.
Replace the entire unit (Do not re-use).
I.42
Part. N. 8000 H1344 (10-2009)