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Replacing the Blades
Model 21623
Service Interval: Yearly
Important:
You will need a torque wrench to
install the blade properly. If you do not have a
torque wrench or are uncomfortable performing
this procedure, contact an Authorized Service
Dealer.
If the blade is damaged or cracked, replace it
immediately. If the blade edge is dull or nicked, have
it sharpened and balanced, or replace it.
WARNING
When servicing the blade, the blade can still
move even though the power source is off.
The blade is sharp; contacting the blade can
result in serious personal injury.
• Keep your hands and feet away from a
moving blade.
• Wear gloves when servicing the blade.
1.
Remove the electric-start button and battery
pack from the machine.
2.
Use a block of wood to hold the blade steady
(Figure
23).
3.
Remove the blades, saving all mounting
hardware
(Figure
Figure 23
4.
Remove the bolts and nuts securing the top and
bottom blades together.
5.
Secure the new blades to each other as shown
in
Figure
24; torque the nuts securing blades
together to 18.9 to 19.6 N∙m (167 to 173 in-lb).
23).
Note:
Ensure that the blade is installed between
the tabs on the underside of the fan.
1. Tab markings on fan
2. Locknut
3. Top blade
6.
Install the new blades using the blade bolt
(Figure
24).
7.
Use a torque wrench to tighten the blade bolt
to 61 to 74 N∙m (45 to 55 ft-lb).
g423077
25
Figure 24
4. Bottom blade
5. Hex-head bolts
6. Blade bolt
g423066
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