Changing Blades - Clarke CBS 355 Operating And Maintenance Instructions Manual

CHANGING BLADES

1. Turn the SWITCH TO 'O' and disconnect from the
power supply. Remove the key from the keyhole.
2. Remove front cover (unscrew the two hex. socket
head screws
4. In both the upper and lower blade guide blocks,
loosen the blade guide locking screws (A1 and
B1) and move the guides away from the blade,
similarly, loosen the lower support bearing locking
screw (C1) and move the bearing away from the
blade.
6. Using the hex key supplied, turn the blade
tensioning bolt clockwise until it is loose, then turn
the tracking adjuster (12, Fig.1) anticlockwise so
that the old blade may be removed.
7. Slip the new blade over the three wheels, so that
the blade is as close as possible to the centre of
the wheels, ensuring the teeth are pointing
towards you and downwards.
8. Turn the tracking adjuster clockwise until the
wheel is as near vertical as is possible to estimate,
then turn the tensioning bolt until the blade is
taught, but not excessively so.
NOTE:
To prevent the blade from slipping off as you turn the
adjuster bolts, press down firmly on the blade between
the wheels on its longest run.
9. Rotate the idler wheel by hand, whilst turning
the tracking adjuster, until the blade centres
correctly on all three wheels. Turning the
tracking adjuster clockwise will cause the blade
to run on the outside of the wheels -
anticlockwise will cause it to run on the inside.
10. Slide the blade support bearings (C, Fig. 8), in
both upper and lower guide blocks, so they
lightly touch the rear of the blade, and lock in
place. Similarly, slide all blade guides ( A & B
Fig.8) so that they very lightly touch the blade,
and lock in place.
12. When satisfied, replace the front cover.
Tracking Adjuster
Turn the Idler wheel
12
Lower blade guide block
Tensioning Bolt
Fig. 8
Fig. 9
Fig. 10
Fig. 11