MTD YARD-MAN YM90 Manuel De L'utilisateur page 10

SECTION 3: ASSEMBLY INSTRUCTIONS
5. Make sure that the cutting blade is centered on the
pilot step and sitting flat against the output shaft
bushing. See Figure 12.
WARNING: If the cutting blade is off-
center, the unit will vibrate and the blade
may fly off, causing possible serious
personal injury.
Pilot Step
Figure 12
6. Align the shaft bushing hole with the locking rod
slot and insert the locking rod into the bushing hole.
See Figure 8.
7. Put the blade retainer and nut on the output shaft.
Make sure that the blade is installed correctly.
8. Tighten nut counterclockwise against the blade while
holding the locking rod:
• If using a torque wrench and an 5/8 inch socket tighten
to: 325 - 335 in•lb, 27 - 28 ft.•lb, 37 - 38 N•m.
• Without a torque wrench, use a 5/8 inch closed-end or
socket wrench, turning the nut until the blade retainer is
snug against the shaft bushing. Make sure that the blade
is installed correctly, then rotate the nut an additional 1/4
to 1/2 turn counterclockwise. See Figure 13.
1/4-1/2 turn
Counterclockwise
Figure 13
9. Remove the locking rod from the locking rod slot.
WARNING: To avoid serious personal
injury or damage to the unit, do not start or
operate this unit with the locking rod in the
locking rod slot.
WARNING: Do not sharpen the cutting blade.
Sharpening the blade can cause the blade tip
to break off while in use. This can result in
severe personal injury. Replace the blade.
Remove the Cutting Blade & Install the
Cutting Attachment
WARNING: To avoid serious personal
injury, always wear gloves while handling or
installing the blade.
Remove the Cutting Blade
1. Align the shaft bushing hole with the locking rod slot and
insert the locking rod into the bushing hole. See Figure 8.
2. Hold the locking rod in place by grasping it next to
the boom of the unit. See Figure 14.
3. While holding the locking rod, loosen the nut on the
blade by turning it clockwise with a 5/8 inch closed-
end or socket wrench. See Figure 14.
Clockwise
4. Remove the nut, blade retainer and blade. Store the
nut and blade together for future use in a secure
place. Store out of children's reach.
Install the Cutting Attachment
5. Align the shaft bushing hole with the locking rod slot and
insert the locking rod into the shaft bushing hole. See
Figure 8. Place the blade retainer on the output shaft
with the flat surface against the output shaft bushing. See
Figure 15. Screw the cutting attachment
counterclockwise onto the output shaft. Tighten securely.
NOTE: The blade retainer must be installed on the output
shaft in the position shown for the cutting
attachment to work correctly.
Cutting Attachment
Blade Retainer
Output Shaft
Bushing
Locking Rod
6. Remove the locking rod.
7. Install the cutting attachment shield. Refer to Remove
and Install the Cutting Attachment Shield.
WARNING: To avoid serious personal
injury, the cutting head guard MUST be in
place at all times while operating the unit
as a trimmer.
10
Figure 14
Figure 15