DeWalt DCMW290 - Blade Maintenance and Sharpening; Importance of Sharp Blade; Blade Balancing Procedure; Sharpening Blade in a Vise

ENGLISH
12

WARNING: Use gloves and proper eye protection.
Turn the mower on its side. Be careful of sharp edges
of blade.
2. Position wood and unscrew flange nut
25
counterclockwise
with a 18mm wrench
26
as shown in Fig.O.
3. Remove square metal blade spacer 
27
, square plastic
blade insulator 
28
and blade 
29
as shown in Fig. P.
The blade fan
30
should not be removed. Examine all
pieces for damage and replace ifnecessary.
4. Install sharpened or new blade
29
on shoulder
31
of
the blade fan
30
as shown in Fig.P.
NOTE: When replacing sharpened or new blade on
shoulder
31
of blade fan
30
, make sure the “GRASS SIDE”
on the blade will be facing the ground when the mower is
returned to its normal uprightposition.
5. Install the plastic blade insulator
28
on the blade such
that the raised lips on one side engage the edges of
theblade.
6. Install the blade spacer
27
so that it sits inside the
raised lips on the other side of the blade insulator. Be
sure to align the flats in the hole of the blade spacer
with the flats of the shaft, rotating the blade and blade
insulator together as necessary.
7. Position piece of wood to keep blade from turning as
shown in Fig. Q. Install flange nut
25
with the flange
against the blade spacer
27
and securely tighten the
blade
29
with a wrench
26
.
Fig. O
24
26
25
Fig. P
25
27
28
29
30
31
25
Fig. Q
29
26
24
Blade Sharpening
KEEP BLADE SHARP FOR BEST MOWER PERFORMANCE. A
DULL BLADE DOES NOT CUT GRASSCLEANLY.

WARNING: Use gloves and proper eye protection
while removing, sharpening, and installing blade.
Ensure that safety key and battery pack are removed.
Sharpening the blade twice during a mowing season is
usually sufficient under normal circumstances. Sand causes
the blade to dull quickly. If your lawn has sandy soil, more
frequent sharpening may berequired. REPLACE BENT OR
DAMAGED BLADEIMMEDIATELY.
When Sharpening the Blade:
• Make sure blade remainsbalanced.
• Sharpen blade at the original cuttingangle.
• Sharpen cutting edges on both ends of blade, removing
equal amounts of material from bothends.
To Sharpen Blade in a Vise: (Fig. R)
1. Be sure the bail handle is released, the blade has
stopped and safety key and battery pack are removed
before removing theblade.
2. Remove blade from mower. See instructions for
Removing and InstallingBlade.
3. Secure blade
29
in a vise
32
.
4. Wear proper eye protection and gloves and be careful
not to cutyourself.
5. Carefully file the cutting edges of the blade with a fine
tooth file
33
or sharpening stone, maintaining the
angle of the original cuttingedge.
6. Check balance of blade. See instructions for
BladeBalancing.
7. Replace blade on mower and tightensecurely.