Feider Machines FRT7550M, Original Instruction

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If you keep the blade sharp and check that it is not damaged, it cuts
better and safer. Check the blade frequently for excessive wear,
cracks or other damage. Frequently inspect the nut holding the blade
in place. Keep this nut firmly in place. If the blade hits an object, stop
the engine. Unplug. Check that the blade is not twisted or damaged.
Check that the adapter is not damaged. Before starting up, replace
damaged parts with original spare parts. Go to the closest
Authorized Service Centre. Every three years have the blade
serviced or replaced with an original spare part by an authorized
expert.
REMOVE AND INSTALL THE BLADE
1. Remove the frame. See the instructions for "Removing the mower
frame".
2. Use a piece of wood to prevent the blade from turning.
3. Unscrew the nut holding the blade (Figure 14).
4. Check the blade and its adapter according to the relevant
instructions. Replace a seriously worn or damaged blade with an
original replacement blade. Go to the closest Authorized Service
Centre.
5. Clean the upper and lower parts of the frame. Remove grass and
debris.
6. Assemble the blade and its adapter to the chuck (Figure 14).
7. Assemble the blade so that its raised edge is in
position. If the blade is upside down, it does not cut properly and can
cause accidents.
8. Adjust the blade with the original seals and nut. Make sure that the
outer rim of the Belleville joint is fixed against the blade (Figure
15).
SHARPEN THE BLADE
CAUTION: risk of vibration if the blade is not properly
balanced or is damaged. A cracked blade can break and
cause an accident.
Keep the edges of the blade sharpened. An un-sharpened blade
turns the grass tip to brown.
1. Sharpen the blade twice a year or every 25 hours.
2. Remove the blade according to the corresponding instructions.
3. Clean the blade with a brush, water and soap. Check the blade for
cracks, nicks or other damage. Replace a seriously worn or
damaged
blade with an original replacement blade. Go to the
closest Authorized Service Centre.
4. Sharpen the blade with a file (Figure 16). Be sure to maintain the
original oblique angle.
5. Ensure that the blade is balanced. Use a screwdriver and hold the
blade parallel to the ground (Figure 16). A balanced blade remains
parallel to the ground . If the blade is not balanced, its heaviest end
turns to the ground . Sharpen this edge until the blade is balanced.
6. A new blade mows better than a seriously worn blade. Every three
years have the blade serviced by an authorized expert or replaced
with an original replacement one.
7. Assemble the blade according to the corresponding instructions.
CAUTION: The nut holding the blade should always be
firmly screwed in. A loose nut or blade can cause
accidents.
MAINTENANCE
CHECK THE BLADE ROTATION control 4. Check the blade(s). Keep the edges of the blade sharpened. An
unsharpened blade causes the grass tips to turn brown.
5. If the cutting quality has not improved, replace the mower belt.
CAUTION: the blade rotation control should operate properly
to avoid injuries.