Lack of a manual for maintenance and repair could mean the company does not expect you to disassemble or do things like lubricating. That said, it is probably prudent that if any lubricant were to be used, it would be best to be food safe.
The motor gears start to make noise and i noticed that the grease inside dry out,so i need to relublicate it.
Of course the company does not expect me to renew this part,they obviously preferes that i will buy a new motor
or even better to buy a new microwave(and every year the service becomes wrose).So,this is not
surprising that they don't make a repair manual.
Refer to the grease,I am also thinking that food grade grease is the better option,but i would like to know if it is matter at all?i mean according to the motor location,can the grease get inside the micro space(as a vapor...),since
i can't see how can it get inside from the motor as a liquid.