Beisler 1220-4 - Manual (Page 63)

Chapter 6: Operation
Page 6-39
4 weeks after putting into operation and then every two years, the oil
of the sewing head must be changed.
1. Turn off release screw (1) and catch the oil in a receptacle.
2. Turn in release screw (1) again.
3. Turn off screw (2) and fill in oil, until the top of the oil
level indicator (3) has reached the upper mark in the oil
viewing glass (4).
4. We recommend Pfaff-sewing machine oil or oil with a
viscosity of 15 mm²/s at 50°C and a density of 0.865 g/cm³
at 15°C.
5. Turn in screw (2).