Murray 405028X51 Operator's Manual page 17

Maintenance
Adjust the Blade Rotation Control
WARNING
To prevent an injury, the blade rotation control must
operate correctly.
In normal usage, the blade rotation control will not re-
quire an adjustment. However, it the cutting perform-
ance decreases or the quality of cut is poor, make the
following changes.
1. When you mow, make sure the throttle control is in
the FAST position.
2. Move the blade rotation control to the DIS-
ENGAGE position (1) (see F F igure 8).
3. Stop the engine. Disconnect the wire from the
spark plug.
4. Check the blade(s). Keep a sharp edge on the
blade(s). A blade that is not sharp will cause the
tips of the grass to become brown.
1
2
5. Disconnect the blade drive spring (2) from the
blade control rod (1) (see F F igure 9). Move the
blade drive spring (2) to the middle hole (4). This
will increase the tension on the mower drive belt.
6. Attach the wire to the spark plug. Mow for a short
distance and again check the quality of cut. If
necessary, move the blade drive spring (2) to the
bottom hole (5).
7. Again check the quality of cut. If the quality of cut
has not improved, replace the mower drive belt.
See "Replace the Mower Drive Belt." If replacing
the belt does not correct the problem, take the unit
to an authorized service center.
2
8. Move the blade rotation control to the DIS-
ENGAGE position. Stop the engine.
9. Check the operation of the blade brake. Rotate the
pulleys with your hand. Make sure the brake pads
(7) are pressed tightly against the pulleys (see
Figure 10).
WARNING
If the brake pads (7) do not press tightly against the
pulleys, take the unit to an authorized service
center.
10. Move the blade rotation control to the ENGAGE
position (2) (see F F igure 8).
11. Check the pads for the blade brake (7) (see
Figure 10). If the pads are excessively worn or
damaged, replace the brake pad assemblies.
Correct replacement parts and assistance are
available from an authorized service center.
Figure 8
5
1
4
7
1
en
3
4
5
Figure 9
6
4
2
3
Figure 10
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