MTD Yard-Man YM90BC Manuel De L'utilisateur page 6

Install the Cutting Blade
WARNING:
To avoid serious personal injury,
always wear gloves while handling or installing the
blade.
4. Place the cutting blade on the output shaft bushing (Fig. 11).
Blade Retainer
Pilot Hole
Output Shaft
Bushing
Locking Rod
5. Make sure that the cutting blade is centered on the pilot step
and sitting flat against the output shaft bushing (Fig. 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
6. Align the shaft bushing hole with the locking rod
slot and insert the locking rod into the bushing hole (Fig. 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 a 13 mm socket tighten to: 325
- 335 in•lb, 27 - 28 ft.•lb, 37 - 38 N•m.
• Without a torque wrench, use a 13 mm 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 (Fig. 13).
1/4-1/2 turn
Counterclockwise
9. Remove the locking rod from the locking rod slot.
6
ASSEMBLY INSTRUCTIONS
Nut
Cutting
Blade
Shield
Mount
Fig. 11
Fig. 12
Fig. 13
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 AND 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 (Fig. 8).
2. Hold the locking rod in place by grasping it next to the
boom of the unit (Fig. 9).
3. While holding the locking rod, loosen the nut on the blade
by turning it clockwise with a 13 mm closed-end or socket
wrench (Fig. 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 (Fig. 8). Place the
blade retainer on the output shaft with the flat surface against
the output shaft bushing (Fig. 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 attachment shield MUST be in place at all
times while operating the unit as a trimmer.
Fig. 14
Fig. 15