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2.GUIDE BAR MAINTENANCE
• Conditions which can require guide bar
maintenance:
--saw cuts to one side
--saw has to be forced through a cut
--inadequate supply of oil to bar and
chain.
• Check the condition of the guide bar each
: r time the chain is sharpened. A worn guide
bar will damage thechain and make cut-
ting more difficult.
• Replace theguide bar when:
.... _the inside groove of the guide bar rails is
worn.
. ,:--the guide bar is bent or cracked.
a, Remove the guide bar to service.
.... b. Clean oil holes at least once for each
five hours of operation.
......................................................................c:---Remove-sawd ust from-the- guide-bar ......................
groove periodically with a putty knife or
a wire. Figure43 '
Sg
d. Remove burrs by filing the side edges
of the guide bar grooves square with a
flat file. Figure44.
e. Restore square edges to an uneven rail
top by filing with aflat file. Figure44.
MAINTAIN ROUNDED CORNER
OF DEPTH GAUGE
.030""
t
Figure 42
I
I CORRECT
GUIDE BAR
GROOVE
IGNITION, COOLING AND EXHAUST SYSTEMS
:: • Carbon deposits will build up on exhaust
ports, spark arrestor, muffler, and spark plug
as the sawis used. All of these parts should
•be cleaned at the same .time to prevent
engine damage, overheating, loss of power,
": and hard starting. ,
. e Clean parts: _
--asrequired
: 'i_at least once for each 25-30 hours of op*
•ration
1. COOLING AND EXHAUST SYSTEM
i
Figure 43
WORN GROOVES _FILE EDGES
SQUARE
Figure44
• Carbon build-up on the cooling and ex-
haust system can cause the engine to
loose power in a cut.
• Keep the spark arrestor clean at all times.
• Replace the spark arrestor when breaks in
the screen are found.
SPARK ARRESTOR
HEAT SHIELD
\
MUFFLER
t
Items required:
--wire brush
3/8" wrench
--hardwood stick
a. Disconnect.the spark plug.
b. Remove .the muffler, baffles, and
screen. Figure 45,
c. Pull the starter (ope until the piston
moves far .enough to close the exhaust
ports..
d. Scrape the carbon deposits from the
exhaust ports and surrounding exhaust
chamber using a hardwood stick.
Figure 46,
[CAUTION:I Do not use a metallic scrap-
ing tool to avoid damage to the piston.
Figure 45 Figure 46 19