How to replace the blade disc of Husqvarna Automower 320, 330X, 420, 430X, 440 and 450X

Tools we use: Torx screwdriver T20, Allen key size 5.
Spare parts used:
For 420, 430X, 440 and 450X:
For 320 and 330X:

Here is a step by step guide of how to disassemble and replace the blade disc on the Husqvarna Automower 320, 330X, 420, 430X, 440 and 450X.
A cracked or damaged blade disc causes an imbalance in the cutting system, resulting in missing blades or noise from the robotic lawnmower. Another common fault is that a threaded insert for a blade on the disc has come loose. It’s also important to change the blade disc.

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