Dolpima PS 490 chain lubrication. How it's done.

The lubrication system of this saw is quite specific. The pump that pumps the oil onto the chain is controlled by the pressure in the crank chamber.
A diaphragm pump is hardly used in modern saws.

You can buy a petrol saw here: https://s.click.aliexpress.com/e/_DlUolrz

See also:
Brushcutter attachment, chainsaw: https://www.youtube.com/watch?v=AdeLjDD_As4&t=2s
Brushcutter attachment - leaf blower: https://www.youtube.com/watch?v=x_4_W0gihSQ&t=37s
Cultivator Brushcutter Attachment: https://www.youtube.com/watch?v=7SYLqXUkr-s&t=12s

Видео Dolpima PS 490 chain lubrication. How it's done. канала Moto Serwis