Nova NG-250, Instruction Manual, Page: 20 / 24

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8. Press the arbor lock button to lock the
arbor. Using the supplied spanner, loosen
and remove the arbor screw and remove
the washer and outer blade flange (Fig. 28,
29, 30). Remove the blade (Fig. 31).
NOTE: The arbor screw is reverse threaded.
Turn to the right to loosen and to the left
to tighten. The inner blade flange can be
left in the service position, but it must be
checked to ensure that it is clean and free
from any debris.
9. Install the new blade (Fig. 32). Make sure
the rotation arrow on the blade matches
the rotation arrow on the upper blade
guard.
Warning: To ensure the correct blade
rotation always install the blade with
the blade teeth pointing downwards.
Ensure the arrow direction on the blade
corresponds with the arrow on the
upper blade guard.
!
10. Install the outer blade flange, washer
and arbor screw.
11. Lock the arbor and tighten the arbor
screw using moderate force, but do not
overtighten.
12. Ensure the spanner is removed and the
arbor lock has been released by rotating
the blade by hand.
13. Return the 'D' shaped arbor guard plate
to its service position and replace its fixing
screw.
14. Return the lower blade guard operating
linkage to its service position and replace
the pivot screw.
15. Check the installation has been
successful by raising and lowering the
cutting head several times. Observe
and ensure the blade guard is operating
correctly.
Fig.32
Fig.31
Fig.28
Fig.29
Fig.30