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: https://www.gplshop.co.uk/en/cutting-... For 320 and 330X: https://www.gplshop.co.uk/en/blade-di... 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.