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D. Changing Blades
1. Before changing blades, always turn off the main switch and unplug the machine.
2. Remove the finger guard after loosening the knurled nut (512-122).
3. Remove the grindstone assy by loosening the screw (512-91).
4. Loosen tension nut (512-115), then withdraw the tension spring (512-114) and the blade
holder (512-113)
5. Remove the upper blade (512-112)
6. The counter blade (512-110) may now be changed as well. It can be pushed up by means of
a screwdriver from beneath the sliding plate and can then be withdrawn sideways from its
pin hole. The sliding angle (512-95) has two holes to take the counter blade. If smaller well
worn upper blades are used, the counter blade may be reset in the second rear hole.
7. Insert and refix new or newly-ground blades in reverse order.
E. Lubrication
1. To reduce friction between upper and counter blades an oiler felt produces a constant film
of oil on the back of the upper blade. Add 1-2 drops of oil several times a day at the oiler
felt cap (512-46).
2. Clean and oil lightly the spring steel strip – guide rail inlay (550-302) occasionally.
F. Changing Carbon Brushes
After about 250 working hours use, the carbon brushes must be checked. At a minimum length of
6.55 mm they must be replaced by brushes of the same type, size and quality.
1. Turn off main switch and unplug the machine.
2. Undo screws (512-31 and -32) and take off motor housing (512-30).
3. Lift tensioning stirrup of the carbons.
4. Withdraw carbon, pull off cable shoe, and change carbon.
5. Reassemble in reverse order.