I guess just proper lubrication just once a month should do.

Hi, I bought a Hercules roadeo, secondhand from a friend who didn't find it very comfortable, and set it myself after numerous trial and error with help from you tube. At first I took it to a Hercules showroom but they ruined the thing with a managed precision, hence I can not rely on them.
Quite often I ride my bike for more than 50 kilometers a day, as this thing runs really smooth. But the crank has developed a screech-screech noise, which reduces if I pedal with straight legs and increases a bit when mine are not so straight. The noise is from the crank/ bottom bracket area. Is there a known remedy? something I can do at my place? or is it better left with more experienced mechanics? ( I gotta find one)

1. Lubricate Chains
2. Check Brake Shoes and Calibrate it
3. Calibrate the High and Low values of the gear changer.
4 Check the AIR.
5.Lubricate gear system
6.Lubricate gear shifter.
7.Lubricate Pedals.

Basically keep it away form water and Lubricate!!!!!