Help on fault finding on a C3-31 Hammer combination machine

[OMLCNC]

Is the coil voltage correct on your replacement contactor ? it shows 230v AC on the drawing, have you checked the voltage at the coil with a meter while it's chattering ?

Here is the replacement contactor details https://chaloncomponents.co.uk/produ...oltage=230v-ac
I will check while chattering.