How To Adjust The Blade Rotationcontrol - Murray 42586X9A Instruction Book

MAINTENANCE
HOW TO ADJUST THE BLADE ROTATIONCONTROL
A ARNING: To prevent an Injury, the blade rotation
control must operate correctly.
In normal usage, lhe blade rotation control will not require an
adjustment. However, if the cutting performance decreases or the
quality of cut is poor, make the following changes.
1. When you mow, make sure the throttlecontrolin in the FAST
position.
2. Move the blade rotation control to the DISENGAGE position
(Figure 16).
3. Stop the engine. Disconnect the wire from the spark plug.
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 to the bottom hole.
7.
Again check the quality of cut. if the quality of cut has not im-
proved, replace the mower drive belt. See UHow To Replace
The Mower Drive Belt". If replacing the belt does not correct the
problem, take the unit to an authorized service center.
8.
Move the blade rotation control to the DISENGAGE posi-
tion. Stop the engine. Disconnect the wire from the spark plug.
Check the operation of the blade brake. Rotate the pulleys with
your hand. Make sure the brake pads are pressed tightly
against the pulleys (Figure 18).
Disengage
3lade RotationControl
EngagePosition
Figure 16
4. Checkthe blade(s). Keep asharp edge on the blade(s).Ablade
that is not sharp will cause the tips of the grass to become
brown.
A
WARNING: if the brake pads do not press tightly
against the pulleys, take the unit to an authorized
service center.
BladeBrake
(BrakePadAgainstPulley)
5.
F- 9889t
Disconnect the blade drive spring from the blade control
rod. Move the blade drive spring to the middle hole
(Figure 17). This will increase the tension on the mower drive
belt.
DISENGAGE POSITION
Blade TopHole(New Belt _ ,
Control R od MiddleHole
B Hole
Blade DriveSpring
Figure
17
22
9.
Move the blade rotation control to the ENGAGE position.
Checkthe pads forthe blade brake. Ifthe pads are excessively
worn or damaged, replace the brake pad assemblies. Correct
replacement parts and assistance are available from an a_ho-
rized service center.
10. Attach the wire to the spark plug. Mowfor ashort distance and
again check the operation of the blade rotation control.
11. When
you move the blade rotation control to the
DISENGAGE position, all movement will stop within five se-
conds. If there is movement of the belt orthe blades continue
to rotate, engage and disengage the blade rotation control
five times to remove any excess rubber from a new mower
drive bait. If you need assistance, take the unit to an autho-
rized service center.
12. If you replace the mower drive belt, move the blade drive
spring to the top hole (Figure 17).