Husqvarna TC 450 Workshop Manual page 227

FRONT SUSPENSION
Drain off any excess oil from the cartridge by moving the shock absorber unit
along its entire length.
Be careful not to warp or damage the piston rod and the other parts.
Remember that excess oil may leak out of the hole in front of the tank.
If there is no oil leakage, it means there is not enough oil inside the cartridge.
Add oil to the cartridge before re-assembling.
Drain off any excess oil from the tank.
Wipe any excess oil off the cartridge.
Assemble the spring guide and the spring on the cartridge unit.
Insert the cartridge unit inside the inner tube.
I.35
Part. N. 8000 H1344 (10-2009)