Husqvarna WSC 40 Operator's Manual page 22

Mounting after maintenance
1 Place the drive sprocket on the output shaft.
2 Assemble according to the illustration.
1
3 Tighten the 2 countersunk screws (1) with tightening
torque 20 Nm.
22 – English
MAINTENANCE
4 Place the chain on the chain bar and make sure that
the chain follows the nose sprockets and the drive
sprockets carefully.
5 When the drive sprocket has been loosen the screw,
threads and bolt head must be greased. If the screw
is not properly greased it will loosen. Always tighten
the screw with tightening torque 20 Nm (15 ft-lbs).
6 Use the twisting knob to adjust the chain tension.
Check the chain tension. Tighten the clamping washer
with the bolt. Use tightening torque 20 Nm (15 ft-lbs).
7 Replace the cover. Tighten the knob carefully by hand.